| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/10/16 18:11 | flow | patch-triage |
3mArgs:null Results: {
"EnableConfigs": [
"CAN",
"PROC_FS",
"CAN_RAW",
"CAN_VCAN"
],
"FocusSymbols": [
"can_stat_update",
"can_init_stats",
"can_reset_stats_proc_show",
"can_stats_proc_show"
],
"KMSANReasoning": "The patch refactors the statistics reset in net/can/proc.c by replacing memset with an explicit can_reset_pkg_stats() helper and uses atomic_long_xchg() to atomically fetch and clear the delta statistics. The underlying structure (net-\u003ecan.pkg_stats) is initially allocated using kzalloc_obj(), and can_reset_pkg_stats() explicitly zeros every member of struct can_pkg_stats (with jiffies_init initialized immediately afterward). Furthermore, these statistics are only formatted as ASCII text for procfs via seq_printf, and no raw structs are copied to user space. There is no risk of uninitialized memory reads or information leaks, making a dedicated KMSAN session unnecessary.",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies CAN network layer statistics handling in net/can/proc.c. It replaces a bulk memset with explicit atomic and member zeroing in can_reset_pkg_stats(), and replaces unsynchronized atomic reads and subsequent sets with atomic_long_xchg() in the periodic timer handler can_stat_update(). This reachable code is in the core network CAN subsystem and accessible via procfs (/proc/net/can/*) and virtual CAN interfaces.",
"WorthFuzzing": true
} |
| 1/1 | 2026/10/16 18:11 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit d5e6da92b4ee908929a542dd9980deab1288bdd2\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Oct 16 18:11:51 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/can/proc.c b/net/can/proc.c\nindex de4d05ae34597..70104f13077e0 100644\n--- a/net/can/proc.c\n+++ b/net/can/proc.c\n@@ -76,16 +76,39 @@ static const char rx_list_name[][8] = {\n * af_can statistics stuff\n */\n \n+static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)\n+{\n+\tatomic_long_set(\u0026pkg_stats-\u003erx_frames, 0);\n+\tatomic_long_set(\u0026pkg_stats-\u003etx_frames, 0);\n+\tatomic_long_set(\u0026pkg_stats-\u003ematches, 0);\n+\n+\tpkg_stats-\u003etotal_rx_rate = 0;\n+\tpkg_stats-\u003etotal_tx_rate = 0;\n+\tpkg_stats-\u003etotal_rx_match_ratio = 0;\n+\n+\tpkg_stats-\u003ecurrent_rx_rate = 0;\n+\tpkg_stats-\u003ecurrent_tx_rate = 0;\n+\tpkg_stats-\u003ecurrent_rx_match_ratio = 0;\n+\n+\tpkg_stats-\u003emax_rx_rate = 0;\n+\tpkg_stats-\u003emax_tx_rate = 0;\n+\tpkg_stats-\u003emax_rx_match_ratio = 0;\n+\n+\tatomic_long_set(\u0026pkg_stats-\u003erx_frames_delta, 0);\n+\tatomic_long_set(\u0026pkg_stats-\u003etx_frames_delta, 0);\n+\tatomic_long_set(\u0026pkg_stats-\u003ematches_delta, 0);\n+}\n+\n static void can_init_stats(struct net *net)\n {\n \tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n \tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n \t/*\n-\t * This memset function is called from a timer context (when\n+\t * This stats reset is called from a timer context (when\n \t * can_stattimer is active which is the default) OR in a process\n \t * context (reading the proc_fs when can_stattimer is disabled).\n \t */\n-\tmemset(pkg_stats, 0, sizeof(struct can_pkg_stats));\n+\tcan_reset_pkg_stats(pkg_stats);\n \tpkg_stats-\u003ejiffies_init = jiffies;\n \n \trcv_lists_stats-\u003estats_reset++;\n@@ -121,9 +144,10 @@ void can_stat_update(struct timer_list *t)\n \tlong rx_frames = atomic_long_read(\u0026pkg_stats-\u003erx_frames);\n \tlong tx_frames = atomic_long_read(\u0026pkg_stats-\u003etx_frames);\n \tlong matches = atomic_long_read(\u0026pkg_stats-\u003ematches);\n-\tlong rx_frames_delta = atomic_long_read(\u0026pkg_stats-\u003erx_frames_delta);\n-\tlong tx_frames_delta = atomic_long_read(\u0026pkg_stats-\u003etx_frames_delta);\n-\tlong matches_delta = atomic_long_read(\u0026pkg_stats-\u003ematches_delta);\n+\t/* fetch and clear values for 'current rate' calculation */\n+\tlong rx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003erx_frames_delta, 0);\n+\tlong tx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003etx_frames_delta, 0);\n+\tlong matches_delta = atomic_long_xchg(\u0026pkg_stats-\u003ematches_delta, 0);\n \n \t/* restart counting in timer context on user request */\n \tif (user_reset)\n@@ -172,11 +196,6 @@ void can_stat_update(struct timer_list *t)\n \tif (pkg_stats-\u003emax_rx_match_ratio \u003c pkg_stats-\u003ecurrent_rx_match_ratio)\n \t\tpkg_stats-\u003emax_rx_match_ratio = pkg_stats-\u003ecurrent_rx_match_ratio;\n \n-\t/* clear values for 'current rate' calculation */\n-\tatomic_long_set(\u0026pkg_stats-\u003etx_frames_delta, 0);\n-\tatomic_long_set(\u0026pkg_stats-\u003erx_frames_delta, 0);\n-\tatomic_long_set(\u0026pkg_stats-\u003ematches_delta, 0);\n-\n \t/* restart timer (one second) */\n \tmod_timer(\u0026net-\u003ecan.stattimer, round_jiffies(jiffies + HZ));\n }\n"
} |
| 2/1 | 2026/10/16 18:11 | agent | patch-evaluator |
2mModel:core Args: null Results: {
"EnableConfigs": [
"CAN",
"PROC_FS",
"CAN_RAW",
"CAN_VCAN"
],
"FocusSymbols": [
"can_stat_update",
"can_init_stats",
"can_reset_stats_proc_show",
"can_stats_proc_show"
],
"Reasoning": "The patch modifies CAN network layer statistics handling in net/can/proc.c. It replaces a bulk memset with explicit atomic and member zeroing in can_reset_pkg_stats(), and replaces unsynchronized atomic reads and subsequent sets with atomic_long_xchg() in the periodic timer handler can_stat_update(). This reachable code is in the core network CAN subsystem and accessible via procfs (/proc/net/can/*) and virtual CAN interfaces.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit d5e6da92b4ee908929a542dd9980deab1288bdd2
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Oct 16 18:11:51 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/can/proc.c b/net/can/proc.c
index de4d05ae34597..70104f13077e0 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -76,16 +76,39 @@ static const char rx_list_name[][8] = {
* af_can statistics stuff
*/
+static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)
+{
+ atomic_long_set(&pkg_stats->rx_frames, 0);
+ atomic_long_set(&pkg_stats->tx_frames, 0);
+ atomic_long_set(&pkg_stats->matches, 0);
+
+ pkg_stats->total_rx_rate = 0;
+ pkg_stats->total_tx_rate = 0;
+ pkg_stats->total_rx_match_ratio = 0;
+
+ pkg_stats->current_rx_rate = 0;
+ pkg_stats->current_tx_rate = 0;
+ pkg_stats->current_rx_match_ratio = 0;
+
+ pkg_stats->max_rx_rate = 0;
+ pkg_stats->max_tx_rate = 0;
+ pkg_stats->max_rx_match_ratio = 0;
+
+ atomic_long_set(&pkg_stats->rx_frames_delta, 0);
+ atomic_long_set(&pkg_stats->tx_frames_delta, 0);
+ atomic_long_set(&pkg_stats->matches_delta, 0);
+}
+
static void can_init_stats(struct net *net)
{
struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
/*
- * This memset function is called from a timer context (when
+ * This stats reset is called from a timer context (when
* can_stattimer is active which is the default) OR in a process
* context (reading the proc_fs when can_stattimer is disabled).
*/
- memset(pkg_stats, 0, sizeof(struct can_pkg_stats));
+ can_reset_pkg_stats(pkg_stats);
pkg_stats->jiffies_init = jiffies;
rcv_lists_stats->stats_reset++;
@@ -121,9 +144,10 @@ void can_stat_update(struct timer_list *t)
long rx_frames = atomic_long_read(&pkg_stats->rx_frames);
long tx_frames = atomic_long_read(&pkg_stats->tx_frames);
long matches = atomic_long_read(&pkg_stats->matches);
- long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta);
- long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta);
- long matches_delta = atomic_long_read(&pkg_stats->matches_delta);
+ /* fetch and clear values for 'current rate' calculation */
+ long rx_frames_delta = atomic_long_xchg(&pkg_stats->rx_frames_delta, 0);
+ long tx_frames_delta = atomic_long_xchg(&pkg_stats->tx_frames_delta, 0);
+ long matches_delta = atomic_long_xchg(&pkg_stats->matches_delta, 0);
/* restart counting in timer context on user request */
if (user_reset)
@@ -172,11 +196,6 @@ void can_stat_update(struct timer_list *t)
if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio)
pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
- /* clear values for 'current rate' calculation */
- atomic_long_set(&pkg_stats->tx_frames_delta, 0);
- atomic_long_set(&pkg_stats->rx_frames_delta, 0);
- atomic_long_set(&pkg_stats->matches_delta, 0);
-
/* restart timer (one second) */
mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ));
}
|
| 3/2 | 2026/10/16 18:11 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 3940 output: 34 thoughts: 123 Thoughts: **Analyzing the CAN Subsystem Patch** Okay, so this patch is touching `net/can/proc.c`. My initial observation is that it seems like we're optimizing how package statistics are handled, probably to reduce locking or improve atomicity. Let's break it down: First, replacing a `memset` with a `can_reset_pkg_stats` function suggests we're either making the initialization more specific to the CAN subsystem or potentially abstracting away some internal details. It could be for performance, perhaps to avoid a full zeroing operation if only certain fields need resetting, or maybe for future extensibility within the `can_pkg_stats` struct. I'll need to dig into `can_reset_pkg_stats` to understand the implications of this change. Is it simply a replacement, or is there a more nuanced difference? Second, the `can_stat_update` modification is more interesting. Swapping out a read-then-set with an `atomic_long_xchg` operation is a classic optimization in concurrent programming. Using `atomic_long_xchg` directly is likely for performance; it avoids the overhead of separate read and write operations, and reduces the risk of race conditions that may come from a read-modify-write approach. I can infer from this that the original implementation probably introduced a window where the stats could be read incorrectly. This change should make the stats updates more reliable. The `0` argument for the atomic exchange hints that we're dealing with "delta" values. Effectively, we're atomically reading the current delta, and resetting it to zero. I need to dive into `net/can/proc.c` and use my preferred tooling to understand this more deeply. I will want to trace the execution and see if this change affects any significant performance or accuracy in the CAN subsystem. |
| 4/2 | 2026/10/16 18:11 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 60,
"LineCount": 80
}Results: {
"Contents": " 60:\t#define CAN_PROC_RCVLIST_FIL \"rcvlist_fil\"\n 61:\t#define CAN_PROC_RCVLIST_INV \"rcvlist_inv\"\n 62:\t#define CAN_PROC_RCVLIST_SFF \"rcvlist_sff\"\n 63:\t#define CAN_PROC_RCVLIST_EFF \"rcvlist_eff\"\n 64:\t#define CAN_PROC_RCVLIST_ERR \"rcvlist_err\"\n 65:\t\n 66:\tstatic int user_reset;\n 67:\t\n 68:\tstatic const char rx_list_name[][8] = {\n 69:\t\t[RX_ERR] = \"rx_err\",\n 70:\t\t[RX_ALL] = \"rx_all\",\n 71:\t\t[RX_FIL] = \"rx_fil\",\n 72:\t\t[RX_INV] = \"rx_inv\",\n 73:\t};\n 74:\t\n 75:\t/*\n 76:\t * af_can statistics stuff\n 77:\t */\n 78:\t\n 79:\tstatic void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)\n 80:\t{\n 81:\t\tatomic_long_set(\u0026pkg_stats-\u003erx_frames, 0);\n 82:\t\tatomic_long_set(\u0026pkg_stats-\u003etx_frames, 0);\n 83:\t\tatomic_long_set(\u0026pkg_stats-\u003ematches, 0);\n 84:\t\n 85:\t\tpkg_stats-\u003etotal_rx_rate = 0;\n 86:\t\tpkg_stats-\u003etotal_tx_rate = 0;\n 87:\t\tpkg_stats-\u003etotal_rx_match_ratio = 0;\n 88:\t\n 89:\t\tpkg_stats-\u003ecurrent_rx_rate = 0;\n 90:\t\tpkg_stats-\u003ecurrent_tx_rate = 0;\n 91:\t\tpkg_stats-\u003ecurrent_rx_match_ratio = 0;\n 92:\t\n 93:\t\tpkg_stats-\u003emax_rx_rate = 0;\n 94:\t\tpkg_stats-\u003emax_tx_rate = 0;\n 95:\t\tpkg_stats-\u003emax_rx_match_ratio = 0;\n 96:\t\n 97:\t\tatomic_long_set(\u0026pkg_stats-\u003erx_frames_delta, 0);\n 98:\t\tatomic_long_set(\u0026pkg_stats-\u003etx_frames_delta, 0);\n 99:\t\tatomic_long_set(\u0026pkg_stats-\u003ematches_delta, 0);\n 100:\t}\n 101:\t\n 102:\tstatic void can_init_stats(struct net *net)\n 103:\t{\n 104:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 105:\t\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n 106:\t\t/*\n 107:\t\t * This stats reset is called from a timer context (when\n 108:\t\t * can_stattimer is active which is the default) OR in a process\n 109:\t\t * context (reading the proc_fs when can_stattimer is disabled).\n 110:\t\t */\n 111:\t\tcan_reset_pkg_stats(pkg_stats);\n 112:\t\tpkg_stats-\u003ejiffies_init = jiffies;\n 113:\t\n 114:\t\trcv_lists_stats-\u003estats_reset++;\n 115:\t\n 116:\t\tif (user_reset) {\n 117:\t\t\tuser_reset = 0;\n 118:\t\t\trcv_lists_stats-\u003euser_reset++;\n 119:\t\t}\n 120:\t}\n 121:\t\n 122:\tstatic unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,\n 123:\t\t\t\t unsigned long count)\n 124:\t{\n 125:\t\tif (oldjif == newjif)\n 126:\t\t\treturn 0;\n 127:\t\n 128:\t\t/* see can_stat_update() - this should NEVER happen! */\n 129:\t\tif (count \u003e (ULONG_MAX / HZ)) {\n 130:\t\t\tprintk(KERN_ERR \"can: calc_rate: count exceeded! %ld\\n\",\n 131:\t\t\t count);\n 132:\t\t\treturn 99999999;\n 133:\t\t}\n 134:\t\n 135:\t\treturn (count * HZ) / (newjif - oldjif);\n 136:\t}\n 137:\t\n 138:\tvoid can_stat_update(struct timer_list *t)\n 139:\t{\n"
} |
| 5/2 | 2026/10/16 18:11 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 5738 output: 35 thoughts: 32 Thoughts: Okay, let's dive into `net/can/proc.c`. My immediate thought is, "Right, let's understand how they're *actually* using the statistics, how they initialize them, and the whole dance with the procfs entries and configurations." I need to see the real-world application, not just the declaration. I want to trace the data flow; how are these statistics being calculated, incremented, and ultimately presented to the user through `/proc`? And what kind of configurable options are exposed that tweak their behavior? This is where the rubber meets the road. Time to get down to the implementation details. |
| 6/2 | 2026/10/16 18:12 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 140,
"LineCount": 80
}Results: {
"Contents": " 140:\t\tstruct net *net = timer_container_of(net, t, can.stattimer);\n 141:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 142:\t\tunsigned long j = jiffies; /* snapshot */\n 143:\t\n 144:\t\tlong rx_frames = atomic_long_read(\u0026pkg_stats-\u003erx_frames);\n 145:\t\tlong tx_frames = atomic_long_read(\u0026pkg_stats-\u003etx_frames);\n 146:\t\tlong matches = atomic_long_read(\u0026pkg_stats-\u003ematches);\n 147:\t\t/* fetch and clear values for 'current rate' calculation */\n 148:\t\tlong rx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003erx_frames_delta, 0);\n 149:\t\tlong tx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003etx_frames_delta, 0);\n 150:\t\tlong matches_delta = atomic_long_xchg(\u0026pkg_stats-\u003ematches_delta, 0);\n 151:\t\n 152:\t\t/* restart counting in timer context on user request */\n 153:\t\tif (user_reset)\n 154:\t\t\tcan_init_stats(net);\n 155:\t\n 156:\t\t/* restart counting on jiffies overflow */\n 157:\t\tif (j \u003c pkg_stats-\u003ejiffies_init)\n 158:\t\t\tcan_init_stats(net);\n 159:\t\n 160:\t\t/* prevent overflow in calc_rate() */\n 161:\t\tif (rx_frames \u003e (LONG_MAX / HZ))\n 162:\t\t\tcan_init_stats(net);\n 163:\t\n 164:\t\t/* prevent overflow in calc_rate() */\n 165:\t\tif (tx_frames \u003e (LONG_MAX / HZ))\n 166:\t\t\tcan_init_stats(net);\n 167:\t\n 168:\t\t/* matches overflow - very improbable */\n 169:\t\tif (matches \u003e (LONG_MAX / 100))\n 170:\t\t\tcan_init_stats(net);\n 171:\t\n 172:\t\t/* calc total values */\n 173:\t\tif (rx_frames)\n 174:\t\t\tpkg_stats-\u003etotal_rx_match_ratio = (matches * 100) / rx_frames;\n 175:\t\n 176:\t\tpkg_stats-\u003etotal_tx_rate = calc_rate(pkg_stats-\u003ejiffies_init, j,\n 177:\t\t\t\t\t\t tx_frames);\n 178:\t\tpkg_stats-\u003etotal_rx_rate = calc_rate(pkg_stats-\u003ejiffies_init, j,\n 179:\t\t\t\t\t\t rx_frames);\n 180:\t\n 181:\t\t/* calc current values */\n 182:\t\tif (rx_frames_delta)\n 183:\t\t\tpkg_stats-\u003ecurrent_rx_match_ratio =\n 184:\t\t\t\t(matches_delta * 100) /\trx_frames_delta;\n 185:\t\n 186:\t\tpkg_stats-\u003ecurrent_tx_rate = calc_rate(0, HZ, tx_frames_delta);\n 187:\t\tpkg_stats-\u003ecurrent_rx_rate = calc_rate(0, HZ, rx_frames_delta);\n 188:\t\n 189:\t\t/* check / update maximum values */\n 190:\t\tif (pkg_stats-\u003emax_tx_rate \u003c pkg_stats-\u003ecurrent_tx_rate)\n 191:\t\t\tpkg_stats-\u003emax_tx_rate = pkg_stats-\u003ecurrent_tx_rate;\n 192:\t\n 193:\t\tif (pkg_stats-\u003emax_rx_rate \u003c pkg_stats-\u003ecurrent_rx_rate)\n 194:\t\t\tpkg_stats-\u003emax_rx_rate = pkg_stats-\u003ecurrent_rx_rate;\n 195:\t\n 196:\t\tif (pkg_stats-\u003emax_rx_match_ratio \u003c pkg_stats-\u003ecurrent_rx_match_ratio)\n 197:\t\t\tpkg_stats-\u003emax_rx_match_ratio = pkg_stats-\u003ecurrent_rx_match_ratio;\n 198:\t\n 199:\t\t/* restart timer (one second) */\n 200:\t\tmod_timer(\u0026net-\u003ecan.stattimer, round_jiffies(jiffies + HZ));\n 201:\t}\n 202:\t\n 203:\t/*\n 204:\t * proc read functions\n 205:\t */\n 206:\t\n 207:\tstatic void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,\n 208:\t\t\t\t struct net_device *dev)\n 209:\t{\n 210:\t\tstruct receiver *r;\n 211:\t\n 212:\t\thlist_for_each_entry_rcu(r, rx_list, list) {\n 213:\t\t\tchar *fmt = (r-\u003ecan_id \u0026 CAN_EFF_FLAG)?\n 214:\t\t\t\t\" %-5s %08x %08x %pK %pK %8ld %s\\n\" :\n 215:\t\t\t\t\" %-5s %03x %08x %pK %pK %8ld %s\\n\";\n 216:\t\n 217:\t\t\tseq_printf(m, fmt, DNAME(dev), r-\u003ecan_id, r-\u003emask,\n 218:\t\t\t\t r-\u003efunc, r-\u003edata, atomic_long_read(\u0026r-\u003ematches),\n 219:\t\t\t\t r-\u003eident);\n"
} |
| 7/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7411 output: 20 thoughts: 31 Thoughts: Here's my take on the thought process, tailored for an expert audience: **Diving into `can_pkg_stats`** Alright, let's get down to brass tacks. I need to understand what `struct can_pkg_stats` looks like. I'm going to start by looking up the definition. No point in trying to reason about its behavior without knowing its constituent members. So, I'll perform a quick search for `struct can_pkg_stats` within the codebase, documentation, or relevant headers. I need to see the fields, their types, and any associated comments to get a good handle on what data this structure is designed to hold. That'll provide the foundation for understanding its use in whatever context I'm dealing with. |
| 8/2 | 2026/10/16 18:12 | tool | grepper |
0mArgs:{
"Expression": "struct can_pkg_stats"
}Results: {
"Output": "include/net/netns/can.h=12=struct can_dev_rcv_lists;\ninclude/net/netns/can.h:13:struct can_pkg_stats;\ninclude/net/netns/can.h-14-struct can_rcv_lists_stats;\n--\ninclude/net/netns/can.h=16=struct netns_can {\n--\ninclude/net/netns/can.h-33-\tstruct timer_list stattimer; /* timer for statistics update */\ninclude/net/netns/can.h:34:\tstruct can_pkg_stats *pkg_stats;\ninclude/net/netns/can.h-35-\tstruct can_rcv_lists_stats *rcv_lists_stats;\n--\nnet/can/af_can.c=202=int can_send(struct sk_buff *skb, int loop)\n--\nnet/can/af_can.c-204-\tstruct sk_buff *newskb = NULL;\nnet/can/af_can.c:205:\tstruct can_pkg_stats *pkg_stats = dev_net(skb-\u003edev)-\u003ecan.pkg_stats;\nnet/can/af_can.c-206-\tint err = -EINVAL;\n--\nnet/can/af_can.c=651=static void can_receive(struct sk_buff *skb, struct net_device *dev)\n--\nnet/can/af_can.c-654-\tstruct net *net = dev_net(dev);\nnet/can/af_can.c:655:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/af_can.c-656-\tint matches;\n--\nnet/can/af_can.h=51=struct receiver {\n--\nnet/can/af_can.h-65-/* can be reset e.g. by can_init_stats() */\nnet/can/af_can.h:66:struct can_pkg_stats {\nnet/can/af_can.h-67-\tunsigned long jiffies_init;\n--\nnet/can/proc.c=68=static const char rx_list_name[][8] = {\n--\nnet/can/proc.c-78-\nnet/can/proc.c:79:static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)\nnet/can/proc.c-80-{\n--\nnet/can/proc.c=102=static void can_init_stats(struct net *net)\nnet/can/proc.c-103-{\nnet/can/proc.c:104:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-105-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n--\nnet/can/proc.c=138=void can_stat_update(struct timer_list *t)\n--\nnet/can/proc.c-140-\tstruct net *net = timer_container_of(net, t, can.stattimer);\nnet/can/proc.c:141:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-142-\tunsigned long j = jiffies; /* snapshot */\n--\nnet/can/proc.c=235=static int can_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-237-\tstruct net *net = m-\u003eprivate;\nnet/can/proc.c:238:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-239-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n--\nnet/can/proc.c=300=static int can_reset_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-303-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\nnet/can/proc.c:304:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-305-\n"
} |
| 9/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8754 output: 36 thoughts: 27 Thoughts: Here's my summary, as though I'm thinking through this process: **Diving into CAN Statistics** Alright, let's get down to brass tacks. I need to understand how the CAN statistics are being tracked in the kernel, and the first place to look is always the header files. Specifically, I'm going straight for `net/can/af_can.h`. That's where I expect to find the low-level definitions for CAN-related structures, and in this case, I'm betting the farm on finding the definition for `struct can_pkg_stats`. That structure will reveal the underlying counters and data points the kernel's using to monitor CAN traffic, and ultimately give me the context I need. It's the key to understanding how these statistics are being gathered and interpreted. Let's see what we find... |
| 10/2 | 2026/10/16 18:12 | tool | read-file |
0mArgs:{
"File": "net/can/af_can.h",
"FirstLine": 60,
"LineCount": 40
}Results: {
"Contents": " 60:\t\tstruct rcu_head rcu;\n 61:\t};\n 62:\t\n 63:\t/* statistic structures */\n 64:\t\n 65:\t/* can be reset e.g. by can_init_stats() */\n 66:\tstruct can_pkg_stats {\n 67:\t\tunsigned long jiffies_init;\n 68:\t\n 69:\t\tatomic_long_t rx_frames;\n 70:\t\tatomic_long_t tx_frames;\n 71:\t\tatomic_long_t matches;\n 72:\t\n 73:\t\tunsigned long total_rx_rate;\n 74:\t\tunsigned long total_tx_rate;\n 75:\t\tunsigned long total_rx_match_ratio;\n 76:\t\n 77:\t\tunsigned long current_rx_rate;\n 78:\t\tunsigned long current_tx_rate;\n 79:\t\tunsigned long current_rx_match_ratio;\n 80:\t\n 81:\t\tunsigned long max_rx_rate;\n 82:\t\tunsigned long max_tx_rate;\n 83:\t\tunsigned long max_rx_match_ratio;\n 84:\t\n 85:\t\tatomic_long_t rx_frames_delta;\n 86:\t\tatomic_long_t tx_frames_delta;\n 87:\t\tatomic_long_t matches_delta;\n 88:\t};\n 89:\t\n 90:\t/* persistent statistics */\n 91:\tstruct can_rcv_lists_stats {\n 92:\t\tunsigned long stats_reset;\n 93:\t\tunsigned long user_reset;\n 94:\t\tunsigned long rcv_entries;\n 95:\t\tunsigned long rcv_entries_max;\n 96:\t};\n 97:\t\n 98:\t/* function prototypes for the CAN networklayer procfs (proc.c) */\n 99:\tvoid can_init_proc(struct net *net);\n"
} |
| 11/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9500 output: 28 thoughts: 468 Thoughts: **Analyzing `struct can_pkg_stats` Initialization and Atomic Operations** Okay, so I'm looking at this `struct can_pkg_stats` definition. Initially, I see the old `memset` call used to initialize it, which immediately raises a red flag in my mind. Specifically, I'm concerned about the `atomic_long_t` members. Using `memset` on atomic variables, as we both know, doesn't guarantee atomic operations. This could introduce concurrency issues and potential data races, as KCSAN would likely flag. So, definitely, using atomic operations for initialization would be a more robust approach. Then, I see the usage pattern with `atomic_long_read` followed by `atomic_long_set` on the delta values, like `rx_frames_delta`. Hold on, this seems like a classic race condition scenario! If frames are received or transmitted between the read and set, that delta information is lost. That's a definite problem. The solution jumps out: `atomic_long_xchg`! This solves the issue perfectly by atomically fetching the delta value *and* resetting it to zero in one operation. No race window, no lost delta frames. Brilliant. I'd like to understand the history behind this change and any similar fixes. I wish I had `git log` to examine the commit log for context. Since that's not possible in this scenario, let's see if we can get some clues from inspecting the surrounding code in `net/can/proc.c` and `net/can/af_can.c`, along with a quick glance at `net/can/Kconfig`. I'm hoping I can glean some insights from the surrounding code and possibly find references to this issue or similar ones. |
| 12/2 | 2026/10/16 18:12 | tool | grepper |
0mError:no matches Args: {
"Expression": "CAN_STAT",
"PathPrefixes": [
"net/can/"
]
}Results: {
"error": "no matches"
} |
| 13/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10385 output: 31 thoughts: 20 Thoughts: Here's my take on the situation: **Investigating CAN Configuration Files** Alright, let's dive right in. My initial thought is to zero in on the core of the Controller Area Network (CAN) driver configuration. I'm going to start by examining two crucial files: `net/can/Makefile` and `net/can/Kconfig`. These are the usual suspects when I'm dealing with kernel modules and configuration options. The `Makefile` will, of course, tell me how the CAN drivers are built, which sources are included, and any dependencies. The `Kconfig` file is where I expect to find the actual configuration options presented to the user during the kernel build process. I'll be looking for things like whether specific CAN controllers are enabled, default settings, and any dependencies on other kernel subsystems. This should give me a good handle on the overall structure and configurability of the CAN stack. I'm expecting to find a solid foundation there. |
| 14/2 | 2026/10/16 18:12 | tool | read-file |
0mArgs:{
"File": "net/can/Makefile",
"FirstLine": 1,
"LineCount": 30
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# Makefile for the Linux Controller Area Network core.\n 4:\t#\n 5:\t\n 6:\tobj-$(CONFIG_CAN)\t+= can.o\n 7:\tcan-y\t\t\t:= af_can.o\n 8:\tcan-$(CONFIG_PROC_FS)\t+= proc.o\n 9:\t\n 10:\tobj-$(CONFIG_CAN_RAW)\t+= can-raw.o\n 11:\tcan-raw-y\t\t:= raw.o\n 12:\t\n 13:\tobj-$(CONFIG_CAN_BCM)\t+= can-bcm.o\n 14:\tcan-bcm-y\t\t:= bcm.o\n 15:\t\n 16:\tobj-$(CONFIG_CAN_GW)\t+= can-gw.o\n 17:\tcan-gw-y\t\t:= gw.o\n 18:\t\n 19:\tobj-$(CONFIG_CAN_J1939)\t+= j1939/\n 20:\t\n 21:\tobj-$(CONFIG_CAN_ISOTP)\t+= can-isotp.o\n 22:\tcan-isotp-y\t\t:= isotp.o\n"
} |
| 15/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10969 output: 32 thoughts: 42 Thoughts: Here's my understanding of the situation, given those lines of code: **Analyzing the Kernel Module Build Configuration** Okay, so I see these lines and my immediate thought is "This is clearly setting up the build rules for some CAN bus-related modules within the kernel." The first line, `obj-$(CONFIG_CAN) += can.o`, tells me that if the `CONFIG_CAN` kernel configuration option is enabled, the `can.o` object file will be included in the build. Conversely, `can-$(CONFIG_PROC_FS) += proc.o` indicates that the `proc.o` object file will be included if the `CONFIG_PROC_FS` option is enabled, and is likely related to exposing CAN bus information through the `/proc` filesystem. To understand the relationship between these and the overall CAN bus subsystem, I need more context. I should check the `net/can/Kconfig` file, which is the standard place for these kinds of configuration options. That file will define `CONFIG_CAN` and the dependencies involved. |
| 16/2 | 2026/10/16 18:12 | tool | read-file |
0mArgs:{
"File": "net/can/Kconfig",
"FirstLine": 1,
"LineCount": 50
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# Controller Area Network (CAN) network layer core configuration\n 4:\t#\n 5:\t\n 6:\tmenuconfig CAN\n 7:\t\ttristate \"CAN bus subsystem support\"\n 8:\t\tselect SKB_EXTENSIONS\n 9:\t\thelp\n 10:\t\t Controller Area Network (CAN) is a slow (up to 1Mbit/s) serial\n 11:\t\t communications protocol. Development of the CAN bus started in\n 12:\t\t 1983 at Robert Bosch GmbH, and the protocol was officially\n 13:\t\t released in 1986. The CAN bus was originally mainly for automotive,\n 14:\t\t but is now widely used in marine (NMEA2000), industrial, and medical\n 15:\t\t applications. More information on the CAN network protocol family\n 16:\t\t PF_CAN is contained in \u003cDocumentation/networking/can.rst\u003e.\n 17:\t\n 18:\t\t If you want CAN support you should say Y here and also to the\n 19:\t\t specific driver for your controller(s) under the Network device\n 20:\t\t support section.\n 21:\t\n 22:\tif CAN\n 23:\t\n 24:\tconfig CAN_RAW\n 25:\t\ttristate \"Raw CAN Protocol (raw access with CAN-ID filtering)\"\n 26:\t\tdefault y\n 27:\t\thelp\n 28:\t\t The raw CAN protocol option offers access to the CAN bus via\n 29:\t\t the BSD socket API. You probably want to use the raw socket in\n 30:\t\t most cases where no higher level protocol is being used. The raw\n 31:\t\t socket has several filter options e.g. ID masking / error frames.\n 32:\t\t To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW.\n 33:\t\n 34:\tconfig CAN_BCM\n 35:\t\ttristate \"Broadcast Manager CAN Protocol (with content filtering)\"\n 36:\t\tdefault y\n 37:\t\thelp\n 38:\t\t The Broadcast Manager offers content filtering, timeout monitoring,\n 39:\t\t sending of RTR frames, and cyclic CAN messages without permanent user\n 40:\t\t interaction. The BCM can be 'programmed' via the BSD socket API and\n 41:\t\t informs you on demand e.g. only on content updates / timeouts.\n 42:\t\t You probably want to use the bcm socket in most cases where cyclic\n 43:\t\t CAN messages are used on the bus (e.g. in automotive environments).\n 44:\t\t To use the Broadcast Manager, use AF_CAN with protocol CAN_BCM.\n 45:\t\n 46:\tconfig CAN_GW\n 47:\t\ttristate \"CAN Gateway/Router (with netlink configuration)\"\n 48:\t\tdefault y\n 49:\t\thelp\n 50:\t\t The CAN Gateway/Router is used to route (and modify) CAN frames.\n"
} |
| 17/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12029 output: 36 thoughts: 138 Thoughts: **CAN Network Interface Discovery** Okay, CAN. Right, that's a *core* Linux network subsystem. I know it's supported, and I'm pretty sure `vcan` is a thing - Virtual CAN. That should be readily available in the kernel and, if I recall correctly, enabled in most Syzkaller configurations, which is great for fuzzing. Wait... Yes, CAN should be *definitely* reachable. The key question is, can I instantiate virtual CAN interfaces or CAN sockets without the need for any physical hardware? Yep, of course! Virtual CAN (`vcan`), `vxcan`, even dummy CAN… they're all there. Okay, so that's established. Now, let's zero in on a specific area. How are those CAN statistics updated? Let's check how `can_stat_update`, `can_init_stats`, and `can_reset_pkg_stats` are called. Time to dive into the codebase and see where those functions are actually invoked within the Linux kernel source tree. Let's start with a thorough search for those function names. That'll give me a good picture of how those statistics are handled within the system. |
| 18/2 | 2026/10/16 18:12 | tool | grepper |
0mArgs:{
"Expression": "can_stat_update|can_init_stats",
"PathPrefixes": [
"net/can/"
]
}Results: {
"Output": "net/can/af_can.c=823=static int can_pernet_init(struct net *net)\n--\nnet/can/af_can.c-838-\t\tif (stats_timer) {\nnet/can/af_can.c:839:\t\t\ttimer_setup(\u0026net-\u003ecan.stattimer, can_stat_update,\nnet/can/af_can.c-840-\t\t\t\t 0);\n--\nnet/can/af_can.h=51=struct receiver {\n--\nnet/can/af_can.h-64-\nnet/can/af_can.h:65:/* can be reset e.g. by can_init_stats() */\nnet/can/af_can.h-66-struct can_pkg_stats {\n--\nnet/can/af_can.h=100=void can_remove_proc(struct net *net);\nnet/can/af_can.h:101:void can_stat_update(struct timer_list *t);\nnet/can/af_can.h-102-\n--\nnet/can/proc.c=79=static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)\n--\nnet/can/proc.c-101-\nnet/can/proc.c:102:static void can_init_stats(struct net *net)\nnet/can/proc.c-103-{\n--\nnet/can/proc.c=122=static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,\n--\nnet/can/proc.c-127-\nnet/can/proc.c:128:\t/* see can_stat_update() - this should NEVER happen! */\nnet/can/proc.c-129-\tif (count \u003e (ULONG_MAX / HZ)) {\n--\nnet/can/proc.c-137-\nnet/can/proc.c:138:void can_stat_update(struct timer_list *t)\nnet/can/proc.c-139-{\n--\nnet/can/proc.c-153-\tif (user_reset)\nnet/can/proc.c:154:\t\tcan_init_stats(net);\nnet/can/proc.c-155-\n--\nnet/can/proc.c-157-\tif (j \u003c pkg_stats-\u003ejiffies_init)\nnet/can/proc.c:158:\t\tcan_init_stats(net);\nnet/can/proc.c-159-\n--\nnet/can/proc.c-161-\tif (rx_frames \u003e (LONG_MAX / HZ))\nnet/can/proc.c:162:\t\tcan_init_stats(net);\nnet/can/proc.c-163-\n--\nnet/can/proc.c-165-\tif (tx_frames \u003e (LONG_MAX / HZ))\nnet/can/proc.c:166:\t\tcan_init_stats(net);\nnet/can/proc.c-167-\n--\nnet/can/proc.c-169-\tif (matches \u003e (LONG_MAX / 100))\nnet/can/proc.c:170:\t\tcan_init_stats(net);\nnet/can/proc.c-171-\n--\nnet/can/proc.c=235=static int can_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-250-\nnet/can/proc.c:251:\tif (net-\u003ecan.stattimer.function == can_stat_update) {\nnet/can/proc.c-252-\t\tseq_printf(m, \" %8ld %% total match ratio (RXMR)\\n\",\n--\nnet/can/proc.c=300=static int can_reset_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-307-\nnet/can/proc.c:308:\tif (net-\u003ecan.stattimer.function == can_stat_update) {\nnet/can/proc.c-309-\t\tseq_printf(m, \"Scheduled statistic reset #%ld.\\n\",\n--\nnet/can/proc.c-312-\t\tif (pkg_stats-\u003ejiffies_init != jiffies)\nnet/can/proc.c:313:\t\t\tcan_init_stats(net);\nnet/can/proc.c-314-\n"
} |
| 19/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13597 output: 35 thoughts: 61 Thoughts: Okay, let's dive into this. Here's how I'd approach this task, walking through the logic: **Examining CAN Statistics Reset in the Kernel** Alright, I need to get a handle on the `can_reset_stats_proc_show` function. My first step is to quickly identify how it's used within the CAN subsystem of the Linux kernel. I'll need to check both `net/can/proc.c` and `net/can/af_can.c` for any references, ensuring I understand the context in which it operates and what other functions call it. Understanding its calls is crucial for understanding its purpose. Then, I'll turn my attention to `net/can/proc.c`, specifically around line 300. I expect this is where the core logic of `can_reset_stats_proc_show` likely resides. By focusing on this area, I can read the surrounding code. This will clarify the exact mechanism for resetting CAN statistics. From there, I'll develop a clear understanding of its operation and implications. |
| 20/2 | 2026/10/16 18:12 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 295,
"LineCount": 50
}Results: {
"Contents": " 295:\t\n 296:\t\tseq_putc(m, '\\n');\n 297:\t\treturn 0;\n 298:\t}\n 299:\t\n 300:\tstatic int can_reset_stats_proc_show(struct seq_file *m, void *v)\n 301:\t{\n 302:\t\tstruct net *net = m-\u003eprivate;\n 303:\t\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n 304:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 305:\t\n 306:\t\tuser_reset = 1;\n 307:\t\n 308:\t\tif (net-\u003ecan.stattimer.function == can_stat_update) {\n 309:\t\t\tseq_printf(m, \"Scheduled statistic reset #%ld.\\n\",\n 310:\t\t\t\t\trcv_lists_stats-\u003estats_reset + 1);\n 311:\t\t} else {\n 312:\t\t\tif (pkg_stats-\u003ejiffies_init != jiffies)\n 313:\t\t\t\tcan_init_stats(net);\n 314:\t\n 315:\t\t\tseq_printf(m, \"Performed statistic reset #%ld.\\n\",\n 316:\t\t\t\t\trcv_lists_stats-\u003estats_reset);\n 317:\t\t}\n 318:\t\treturn 0;\n 319:\t}\n 320:\t\n 321:\tstatic inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,\n 322:\t\t\t\t\t\t struct net_device *dev,\n 323:\t\t\t\t\t\t struct can_dev_rcv_lists *dev_rcv_lists)\n 324:\t{\n 325:\t\tif (!hlist_empty(\u0026dev_rcv_lists-\u003erx[idx])) {\n 326:\t\t\tcan_print_recv_banner(m);\n 327:\t\t\tcan_print_rcvlist(m, \u0026dev_rcv_lists-\u003erx[idx], dev);\n 328:\t\t} else\n 329:\t\t\tseq_printf(m, \" (%s: no entry)\\n\", DNAME(dev));\n 330:\t\n 331:\t}\n 332:\t\n 333:\tstatic int can_rcvlist_proc_show(struct seq_file *m, void *v)\n 334:\t{\n 335:\t\t/* double cast to prevent GCC warning */\n 336:\t\tint idx = (int)(long)pde_data(m-\u003efile-\u003ef_inode);\n 337:\t\tstruct net_device *dev;\n 338:\t\tstruct can_dev_rcv_lists *dev_rcv_lists;\n 339:\t\tstruct net *net = m-\u003eprivate;\n 340:\t\n 341:\t\tseq_printf(m, \"\\nreceive list '%s':\\n\", rx_list_name[idx]);\n 342:\t\n 343:\t\trcu_read_lock();\n 344:\t\n"
} |
| 21/2 | 2026/10/16 18:12 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14742 output: 30 thoughts: 17 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing `can_init_proc` for Proc File Creation** Alright, let's dive into this `can_init_proc` function. My initial focus is on *how* it's creating proc files. I need to pinpoint the exact locations within the kernel where these virtual filesystems are being established, as that's often where the core control or registration occurs. I'm thinking about the kernel subsystems involved, like the proc filesystem itself, and any potential helper functions used for proc entry creation. I know there are usually specific routines for registering new proc entries, perhaps with associated data structures. I'll need to trace those function calls and understand the arguments passed to them, as that's where I can probably customize behavior, or better understand how this module handles proc entries. I'll be looking for clues about permissions, ownership, and the type of data exposed through these proc files as I trace through this. Understanding the underlying structures used to manage those files is key. |
| 22/2 | 2026/10/16 18:13 | tool | grepper |
0mArgs:{
"Expression": "can_init_proc",
"PathPrefixes": [
"net/can/"
]
}Results: {
"Output": "net/can/af_can.c=823=static int can_pernet_init(struct net *net)\n--\nnet/can/af_can.c-844-\t\tnet-\u003ecan.pkg_stats-\u003ejiffies_init = jiffies;\nnet/can/af_can.c:845:\t\tcan_init_proc(net);\nnet/can/af_can.c-846-\t}\n--\nnet/can/af_can.h=91=struct can_rcv_lists_stats {\n--\nnet/can/af_can.h-98-/* function prototypes for the CAN networklayer procfs (proc.c) */\nnet/can/af_can.h:99:void can_init_proc(struct net *net);\nnet/can/af_can.h-100-void can_remove_proc(struct net *net);\n--\nnet/can/proc.c=422=static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-455-/*\nnet/can/proc.c:456: * can_init_proc - create main CAN proc directory and procfs entries\nnet/can/proc.c-457- */\nnet/can/proc.c:458:void can_init_proc(struct net *net)\nnet/can/proc.c-459-{\n"
} |
| 23/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15377 output: 37 thoughts: 24 Thoughts: Okay, let's dive into this. Here's my thought process on this task: **Analyzing the Initialization Procedure for CAN Per-Net Devices** Alright, the objective is pretty clear. I need to get my head around the initialization process of CAN per-net devices. The starting point is, predictably, the `can_pernet_init` function. The logical place to find it is, naturally, `net/can/af_can.c`. That file is the canonical location for CAN-related socket functionality within the Linux kernel, so `af_can.c` is the most obvious starting point. I'll need to carefully examine what `can_pernet_init` actually *does*. I need to look beyond its name, and understand what data structures it manipulates, what other functions it calls, and how it integrates with the overall CAN network device architecture. This is where I'll get the specifics I need. |
| 24/2 | 2026/10/16 18:13 | tool | read-file |
0mArgs:{
"File": "net/can/af_can.c",
"FirstLine": 820,
"LineCount": 40
}Results: {
"Contents": " 820:\t}\n 821:\tEXPORT_SYMBOL(can_proto_unregister);\n 822:\t\n 823:\tstatic int can_pernet_init(struct net *net)\n 824:\t{\n 825:\t\tspin_lock_init(\u0026net-\u003ecan.rcvlists_lock);\n 826:\t\tnet-\u003ecan.rx_alldev_list = kzalloc_obj(*net-\u003ecan.rx_alldev_list);\n 827:\t\tif (!net-\u003ecan.rx_alldev_list)\n 828:\t\t\tgoto out;\n 829:\t\tnet-\u003ecan.pkg_stats = kzalloc_obj(*net-\u003ecan.pkg_stats);\n 830:\t\tif (!net-\u003ecan.pkg_stats)\n 831:\t\t\tgoto out_free_rx_alldev_list;\n 832:\t\tnet-\u003ecan.rcv_lists_stats = kzalloc_obj(*net-\u003ecan.rcv_lists_stats);\n 833:\t\tif (!net-\u003ecan.rcv_lists_stats)\n 834:\t\t\tgoto out_free_pkg_stats;\n 835:\t\n 836:\t\tif (IS_ENABLED(CONFIG_PROC_FS)) {\n 837:\t\t\t/* the statistics are updated every second (timer triggered) */\n 838:\t\t\tif (stats_timer) {\n 839:\t\t\t\ttimer_setup(\u0026net-\u003ecan.stattimer, can_stat_update,\n 840:\t\t\t\t\t 0);\n 841:\t\t\t\tmod_timer(\u0026net-\u003ecan.stattimer,\n 842:\t\t\t\t\t round_jiffies(jiffies + HZ));\n 843:\t\t\t}\n 844:\t\t\tnet-\u003ecan.pkg_stats-\u003ejiffies_init = jiffies;\n 845:\t\t\tcan_init_proc(net);\n 846:\t\t}\n 847:\t\n 848:\t\treturn 0;\n 849:\t\n 850:\t out_free_pkg_stats:\n 851:\t\tkfree(net-\u003ecan.pkg_stats);\n 852:\t out_free_rx_alldev_list:\n 853:\t\tkfree(net-\u003ecan.rx_alldev_list);\n 854:\t out:\n 855:\t\treturn -ENOMEM;\n 856:\t}\n 857:\t\n 858:\tstatic void can_pernet_exit(struct net *net)\n 859:\t{\n"
} |
| 25/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16288 output: 28 thoughts: 137 Thoughts: Okay, let's break this down. **Initial Impressions of `can_pernet_init`** Alright, so I'm seeing that `can_pernet_init` is called every time a new network namespace is created. That's good to know, that's the starting point. Now, what's happening *inside*? It looks like we're conditionally initializing a timer based on a few factors. Specifically, if `IS_ENABLED(CONFIG_PROC_FS)` is true, and if `stats_timer` is also true. Since `stats_timer` is almost certainly a boolean, so let's check its default. I'm guessing that means a timer is set up and started. It's using `timer_setup` with `can_stat_update` as the function and `mod_timer` which looks like it will start the timer. So, it will call `can_stat_update` after a given interval. I should probably dig into the `stats_timer` declaration in `af_can.c` just to confirm my assumptions and understand what that value means. |
| 26/2 | 2026/10/16 18:13 | tool | grepper |
0mArgs:{
"Expression": "stats_timer",
"PathPrefixes": [
"net/can/"
]
}Results: {
"Output": "net/can/af_can.c=73=MODULE_ALIAS_NETPROTO(PF_CAN);\nnet/can/af_can.c-74-\nnet/can/af_can.c:75:static int stats_timer __read_mostly = 1;\nnet/can/af_can.c:76:module_param(stats_timer, int, 0444);\nnet/can/af_can.c:77:MODULE_PARM_DESC(stats_timer, \"enable timer for statistics (default:on)\");\nnet/can/af_can.c-78-\n--\nnet/can/af_can.c=823=static int can_pernet_init(struct net *net)\n--\nnet/can/af_can.c-837-\t\t/* the statistics are updated every second (timer triggered) */\nnet/can/af_can.c:838:\t\tif (stats_timer) {\nnet/can/af_can.c-839-\t\t\ttimer_setup(\u0026net-\u003ecan.stattimer, can_stat_update,\n--\nnet/can/af_can.c=858=static void can_pernet_exit(struct net *net)\n--\nnet/can/af_can.c-861-\t\tcan_remove_proc(net);\nnet/can/af_can.c:862:\t\tif (stats_timer)\nnet/can/af_can.c-863-\t\t\ttimer_delete_sync(\u0026net-\u003ecan.stattimer);\n"
} |
| 27/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17073 output: 35 thoughts: 152 Thoughts: **My Analysis of CAN Statistics and Potential Race Conditions** Okay, so I'm looking at this CAN statistics implementation, and a few things jump out. The `stats_timer` variable defaults to 1, meaning that every time a net namespace is initialized—or even during system boot for `init_net`—`can.stattimer` is configured to run `can_stat_update` every second. This `can_stat_update` function is where things get interesting because it's responsible for reading and modifying `pkg_stats`. That's the core data structure containing all the performance metrics. And here's where my alarm bells start ringing... userspace can interact with all of this through procfs entries. Specifically, there's `/proc/net/can/reset_stats` which calls `can_init_stats`, which sounds like it could potentially reset the metrics while `can_stat_update` is running (or soon will be). Then, `/proc/net/can/stats` allows userspace to *read* the stats. A race condition is starting to form in my mind here. A read of stats that are concurrently being written. To get a better understanding of how these procfs entries are created and interact with the statistics, I'm going to quickly check how `can_init_proc` is defined. Let's see... it's in `net/can/proc.c`. Time to dig in! |
| 28/2 | 2026/10/16 18:13 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 455,
"LineCount": 40
}Results: {
"Contents": " 455:\t/*\n 456:\t * can_init_proc - create main CAN proc directory and procfs entries\n 457:\t */\n 458:\tvoid can_init_proc(struct net *net)\n 459:\t{\n 460:\t\t/* create /proc/net/can directory */\n 461:\t\tnet-\u003ecan.proc_dir = proc_net_mkdir(net, \"can\", net-\u003eproc_net);\n 462:\t\n 463:\t\tif (!net-\u003ecan.proc_dir) {\n 464:\t\t\tprintk(KERN_INFO \"can: failed to create /proc/net/can . \"\n 465:\t\t\t\t \"CONFIG_PROC_FS missing?\\n\");\n 466:\t\t\treturn;\n 467:\t\t}\n 468:\t\n 469:\t\t/* own procfs entries from the AF_CAN core */\n 470:\t\tnet-\u003ecan.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644,\n 471:\t\t\t\tnet-\u003ecan.proc_dir, can_stats_proc_show, NULL);\n 472:\t\tnet-\u003ecan.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS,\n 473:\t\t\t\t0644, net-\u003ecan.proc_dir, can_reset_stats_proc_show,\n 474:\t\t\t\tNULL);\n 475:\t\tnet-\u003ecan.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR,\n 476:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_proc_show,\n 477:\t\t\t\t(void *)RX_ERR);\n 478:\t\tnet-\u003ecan.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL,\n 479:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_proc_show,\n 480:\t\t\t\t(void *)RX_ALL);\n 481:\t\tnet-\u003ecan.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL,\n 482:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_proc_show,\n 483:\t\t\t\t(void *)RX_FIL);\n 484:\t\tnet-\u003ecan.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV,\n 485:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_proc_show,\n 486:\t\t\t\t(void *)RX_INV);\n 487:\t\tnet-\u003ecan.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF,\n 488:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_eff_proc_show, NULL);\n 489:\t\tnet-\u003ecan.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF,\n 490:\t\t\t\t0644, net-\u003ecan.proc_dir, can_rcvlist_sff_proc_show, NULL);\n 491:\t}\n 492:\t\n 493:\t/*\n 494:\t * can_remove_proc - remove procfs entries and main CAN proc directory\n"
} |
| 29/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18463 output: 37 thoughts: 168 Thoughts: **Analyzing CAN Packet Statistics** Okay, let's dive into this. I need to understand how CAN packet transmission and reception are tracked, specifically within `af_can.c`. My initial focus is on the `can_send` and `can_receive` functions. It appears that there are specific atomic operations happening here. In `can_send`, I see `atomic_long_inc(&pkg_stats->tx_frames)` and `atomic_long_inc(&pkg_stats->tx_frames_delta)`, which increment the total and delta transmit frame counters, respectively. Over in `can_receive`, I find analogous increments for receive frames: `atomic_long_inc(&pkg_stats->rx_frames)` and `atomic_long_inc(&pkg_stats->rx_frames_delta)`. Furthermore, it seems that there's also logic associated with "matches" in the receive path: `atomic_long_add(matches, &pkg_stats->matches)` and `atomic_long_add(matches, &pkg_stats->matches_delta)`. I'll need to drill down to understand what constitutes a "match" within this context. |
| 30/2 | 2026/10/16 18:13 | tool | read-file |
0mArgs:{
"File": "net/can/af_can.c",
"FirstLine": 235,
"LineCount": 25
}Results: {
"Contents": " 235:\t\t\terr = -ENETDOWN;\n 236:\t\t\tgoto inval_skb;\n 237:\t\t}\n 238:\t\n 239:\t\tskb-\u003eip_summed = CHECKSUM_UNNECESSARY;\n 240:\t\n 241:\t\tskb_reset_mac_header(skb);\n 242:\t\tskb_reset_network_header(skb);\n 243:\t\tskb_reset_transport_header(skb);\n 244:\t\n 245:\t\tif (loop) {\n 246:\t\t\t/* local loopback of sent CAN frames */\n 247:\t\n 248:\t\t\t/* indication for the CAN driver: do loopback */\n 249:\t\t\tskb-\u003epkt_type = PACKET_LOOPBACK;\n 250:\t\n 251:\t\t\t/* The reference to the originating sock may be required\n 252:\t\t\t * by the receiving socket to check whether the frame is\n 253:\t\t\t * its own. Example: can_raw sockopt CAN_RAW_RECV_OWN_MSGS\n 254:\t\t\t * Therefore we have to ensure that skb-\u003esk remains the\n 255:\t\t\t * reference to the originating sock by restoring skb-\u003esk\n 256:\t\t\t * after each skb_clone() or skb_orphan() usage.\n 257:\t\t\t */\n 258:\t\n 259:\t\t\tif (!(skb-\u003edev-\u003eflags \u0026 IFF_ECHO)) {\n"
} |
| 31/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19309 output: 33 thoughts: 20 Thoughts: Here's my thought process, as requested: **Tracing `pkg_stats` in `af_can.c`** Okay, so I need to understand how `pkg_stats` is being used within `af_can.c`. Clearly, I need to start by looking for where this variable is accessed – read, written, modified, you know the drill. My initial focus will be on finding any direct references to it within the file. I'll probably start with a simple search for the exact identifier, `pkg_stats`. Once I've got a list of the locations where it's touched, I can start to piece together the logic around it. I'll need to consider how the code initializes it (if it's a global, a local, or something else), how it's updated, and especially *why* those updates are happening. Is it for performance analysis, error tracking, or something else entirely? Knowing my way around `af_can.c`, I'll be keeping an eye out for any interactions with other data structures or functions within that module that could shed more light on its purpose. Ultimately, I'm aiming to build a mental model of how `pkg_stats` contributes to the overall behavior of the CAN implementation. |
| 32/2 | 2026/10/16 18:13 | tool | grepper |
0mArgs:{
"Expression": "pkg_stats",
"PathPrefixes": [
"net/can/af_can.c"
]
}Results: {
"Output": "net/can/af_can.c=202=int can_send(struct sk_buff *skb, int loop)\n--\nnet/can/af_can.c-204-\tstruct sk_buff *newskb = NULL;\nnet/can/af_can.c:205:\tstruct can_pkg_stats *pkg_stats = dev_net(skb-\u003edev)-\u003ecan.pkg_stats;\nnet/can/af_can.c-206-\tint err = -EINVAL;\n--\nnet/can/af_can.c-291-\t/* update statistics */\nnet/can/af_can.c:292:\tatomic_long_inc(\u0026pkg_stats-\u003etx_frames);\nnet/can/af_can.c:293:\tatomic_long_inc(\u0026pkg_stats-\u003etx_frames_delta);\nnet/can/af_can.c-294-\n--\nnet/can/af_can.c=651=static void can_receive(struct sk_buff *skb, struct net_device *dev)\n--\nnet/can/af_can.c-654-\tstruct net *net = dev_net(dev);\nnet/can/af_can.c:655:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/af_can.c-656-\tint matches;\n--\nnet/can/af_can.c-658-\t/* update statistics */\nnet/can/af_can.c:659:\tatomic_long_inc(\u0026pkg_stats-\u003erx_frames);\nnet/can/af_can.c:660:\tatomic_long_inc(\u0026pkg_stats-\u003erx_frames_delta);\nnet/can/af_can.c-661-\n--\nnet/can/af_can.c-676-\tif (matches \u003e 0) {\nnet/can/af_can.c:677:\t\tatomic_long_inc(\u0026pkg_stats-\u003ematches);\nnet/can/af_can.c:678:\t\tatomic_long_inc(\u0026pkg_stats-\u003ematches_delta);\nnet/can/af_can.c-679-\t}\n--\nnet/can/af_can.c=823=static int can_pernet_init(struct net *net)\n--\nnet/can/af_can.c-828-\t\tgoto out;\nnet/can/af_can.c:829:\tnet-\u003ecan.pkg_stats = kzalloc_obj(*net-\u003ecan.pkg_stats);\nnet/can/af_can.c:830:\tif (!net-\u003ecan.pkg_stats)\nnet/can/af_can.c-831-\t\tgoto out_free_rx_alldev_list;\n--\nnet/can/af_can.c-833-\tif (!net-\u003ecan.rcv_lists_stats)\nnet/can/af_can.c:834:\t\tgoto out_free_pkg_stats;\nnet/can/af_can.c-835-\n--\nnet/can/af_can.c-843-\t\t}\nnet/can/af_can.c:844:\t\tnet-\u003ecan.pkg_stats-\u003ejiffies_init = jiffies;\nnet/can/af_can.c-845-\t\tcan_init_proc(net);\n--\nnet/can/af_can.c-849-\nnet/can/af_can.c:850: out_free_pkg_stats:\nnet/can/af_can.c:851:\tkfree(net-\u003ecan.pkg_stats);\nnet/can/af_can.c-852- out_free_rx_alldev_list:\n--\nnet/can/af_can.c=858=static void can_pernet_exit(struct net *net)\n--\nnet/can/af_can.c-866-\tkfree(net-\u003ecan.rx_alldev_list);\nnet/can/af_can.c:867:\tkfree(net-\u003ecan.pkg_stats);\nnet/can/af_can.c-868-\tkfree(net-\u003ecan.rcv_lists_stats);\n"
} |
| 33/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20694 output: 18 thoughts: 2924 Thoughts: **Analysis of CAN Statistics Update Patch for Fuzzing Suitability** I've examined a patch modifying the CAN bus subsystem's statistics update mechanism within the Linux kernel. My assessment indicates a high likelihood of this being suitable for fuzzing, given the changes involve reachable kernel code and touch on critical concurrency aspects. The patch alters the `net/can/proc.c` file, specifically impacting how CAN statistics are collected and updated. The most notable change is the replacement of `atomic_long_read` followed by `atomic_long_set` operations with a single `atomic_long_xchg` operation. This refactoring is crucial as it addresses a potential race condition when calculating "current rates" (e.g., RX/TX frame rates) and ensures atomic updates of delta values. This direct manipulation of atomic variables and concurrency handling immediately raises a flag for potential bugs under concurrent access, which is something fuzzing excels at uncovering. The patch introduces a `can_reset_pkg_stats` function to reset the statistics to zero and calls this when a reset occurs. Specifically, `can_stat_update` is the central function affected. This function is triggered by a timer and calls an atomic exchange operation to clear delta values. Based on the code changes and the potential for concurrency bugs, this is definitely worth fuzzing and the main entry point is `can_stat_update`. The ability to interact with the CAN subsystem through standard networking APIs (likely `vcan` is sufficient) means this is a practical fuzzing target. Key symbols to focus on are: * `can_stat_update` This function is a timer callback and is critical, this is where the `atomic_long_xchg` update is taking place. * `can_reset_stats_proc_show` This function resets the stats and is accessible via `/proc/net/can/reset_stats`. * `can_stats_proc_show` This function retrieves statistics and is accessible via `/proc/net/can/stats`. To enable this for fuzzing, the following kernel configurations are required: * `CONFIG_CAN=y` (or `m`) * `CONFIG_PROC_FS=y` The fact that the code touches these frequently exercised functions, alongside the inherent concurrency issues, solidifies its suitability for fuzzing. |
| 34/2 | 2026/10/16 18:13 | tool | grepper |
0mArgs:{
"Expression": "config PROC_FS"
}Results: {
"Output": "fs/proc/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nfs/proc/Kconfig:2:config PROC_FS\nfs/proc/Kconfig-3-\tbool \"/proc file system support\" if EXPERT\n"
} |
| 35/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24206 output: 19 thoughts: 57 Thoughts: Okay, here's my take on those thoughts, framed as my own: **Considering Procfs and Virtual CAN for CAN Statistics** Right, so `PROC_FS` is independent – that's expected, a fundamental part of the system's core. Good, one less thing to worry about in terms of dependencies. But I'm thinking about how to actually get some useful, tangible statistics out of all this CAN bus interaction. We're talking about *virtual* CAN here, so I need a way to, well, *virtually* increment those counters. Just knowing CAN is *enabled* isn't enough, I need to understand data flow! That's where `VCAN` comes in. It seems like the obvious choice to simulate sending and receiving CAN packets, all while ensuring that the relevant statistics are updated. Let me quickly check the configuration for `CONFIG_CAN_VCAN` to confirm that it's enabled and that it plays nicely with the rest of the CAN subsystem. I'll need to make sure this is functional if I want to have a complete and working implementation. |
| 36/2 | 2026/10/16 18:13 | tool | grepper |
0mArgs:{
"Expression": "config CAN_VCAN"
}Results: {
"Output": "drivers/net/can/Kconfig=23=if CAN_DEV\ndrivers/net/can/Kconfig-24-\ndrivers/net/can/Kconfig:25:config CAN_VCAN\ndrivers/net/can/Kconfig-26-\ttristate \"Virtual Local CAN Interface (vcan)\"\n"
} |
| 37/2 | 2026/10/16 18:13 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24599 output: 34 thoughts: 20 Thoughts: Here's a summary of my thought process, keeping in mind my field of expertise: **Diving into the CAN Driver Configuration** Okay, time to get to the heart of the matter. Let's start digging into the CAN driver configuration within the kernel. My initial focus is the `drivers/net/can/Kconfig` file. I'm specifically zeroing in around line 20, as that's often where the core options and dependencies are defined in these Kconfig files. This is where I'll expect to find the high-level configurations for the CAN subsystem – things like enabling/disabling CAN support altogether, selecting different CAN bus drivers, or perhaps the initial parameters of the configuration. Let's see what interesting configurations are hidden there. |
| 38/2 | 2026/10/16 18:14 | tool | read-file |
0mArgs:{
"File": "drivers/net/can/Kconfig",
"FirstLine": 1,
"LineCount": 40
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t\n 3:\tmenuconfig CAN_DEV\n 4:\t\ttristate \"CAN Device Drivers\"\n 5:\t\tdefault y\n 6:\t\tdepends on CAN\n 7:\t\thelp\n 8:\t\t Controller Area Network (CAN) is serial communications protocol up to\n 9:\t\t 1Mbit/s for its original release (now known as Classical CAN) and up\n 10:\t\t to 8Mbit/s for the more recent CAN with Flexible Data-Rate\n 11:\t\t (CAN-FD). The CAN bus was originally mainly for automotive, but is now\n 12:\t\t widely used in marine (NMEA2000), industrial, and medical\n 13:\t\t applications. More information on the CAN network protocol family\n 14:\t\t PF_CAN is contained in \u003cDocumentation/networking/can.rst\u003e.\n 15:\t\n 16:\t\t This section contains all the CAN(-FD) device drivers including the\n 17:\t\t virtual ones. If you own such devices or plan to use the virtual CAN\n 18:\t\t interfaces to develop applications, say Y here.\n 19:\t\n 20:\t\t To compile as a module, choose M here: the module will be called\n 21:\t\t can-dev.\n 22:\t\n 23:\tif CAN_DEV\n 24:\t\n 25:\tconfig CAN_VCAN\n 26:\t\ttristate \"Virtual Local CAN Interface (vcan)\"\n 27:\t\thelp\n 28:\t\t Similar to the network loopback devices, vcan offers a\n 29:\t\t virtual local CAN interface.\n 30:\t\n 31:\t\t This driver can also be built as a module. If so, the module\n 32:\t\t will be called vcan.\n 33:\t\n 34:\tconfig CAN_VXCAN\n 35:\t\ttristate \"Virtual CAN Tunnel (vxcan)\"\n 36:\t\thelp\n 37:\t\t Similar to the virtual ethernet driver veth, vxcan implements a\n 38:\t\t local CAN traffic tunnel between two virtual CAN network devices.\n 39:\t\t When creating a vxcan, two vxcan devices are created as pair.\n 40:\t\t When one end receives the packet it appears on its pair and vice\n"
} |
| 39/2 | 2026/10/16 18:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25402 output: 186 thoughts: 941 Thoughts: **Analysis of CAN Network Statistics in procfs** Okay, so I'm looking at this CAN statistics code and how we can best approach fuzzing it. I see that `CAN_RAW` is relevant for socket communication, which is good to keep in mind. Let me quickly verify the relevant configuration options. Right, we need `CONFIG_CAN`, `CONFIG_PROC_FS`, `CONFIG_CAN_RAW`, and `CONFIG_CAN_VCAN`. To be clear, just to get `net/can/proc.c` to even compile, we need `CAN` and `PROC_FS`. If we actually want to *do* something and trigger changes, we'll need `CAN_RAW` and `CAN_VCAN` (or `CAN_DEV`) to touch the `rx_frames_delta` and `tx_frames_delta` values. So, let's include all of them. Now, let's zero in on the key functions we should focus on. Based on the code, these look important: `can_stat_update` (where we see an `atomic_long_xchg`), `can_reset_stats_proc_show` (that handles `/proc/net/can/reset_stats` and uses `user_reset`), `can_stats_proc_show` (for `/proc/net/can/stats`), and `can_init_stats`. I should note that `can_init_stats` calls `can_reset_pkg_stats` which sets a lot of the atomic variables to zero. Let me just quickly confirm that `can_reset_pkg_stats` is small and static, which it appears to be. Examining the code, it looks clean and it's called only by `can_init_stats`, which itself is only called in `can_stat_update` and `can_reset_stats_proc_show` within the proc file. Therefore, `can_stat_update`, `can_reset_stats_proc_show`, `can_stats_proc_show`, and `can_init_stats` are the precise functions of interest. Alright, let's see if anything else was changed. Nope, just `net/can/proc.c`. Perfect. So, is this code *really* worth fuzzing? Let's check: Yes, executable code changed in `net/can/proc.c`. Yes, it's in the reachable CAN network layer subsystem. It's not just logging or documentation. This code specifically handles race conditions and data races with the atomic operations and the timer updates. So, yes, `WorthFuzzing = true`. Just to reiterate, the required configs are: `CAN`, `PROC_FS`, `CAN_RAW`, and `CAN_VCAN`. And the focused symbols: `can_stat_update`, `can_init_stats`, `can_reset_stats_proc_show`, and `can_stats_proc_show`. I think we have everything organized now. Time to generate the `set-results`. |
| 40/2 | 2026/10/16 18:14 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"CAN",
"PROC_FS",
"CAN_RAW",
"CAN_VCAN"
],
"FocusSymbols": [
"can_stat_update",
"can_init_stats",
"can_reset_stats_proc_show",
"can_stats_proc_show"
],
"Reasoning": "The patch modifies CAN network layer statistics handling in net/can/proc.c. It replaces a bulk memset with explicit atomic and member zeroing in can_reset_pkg_stats(), and replaces unsynchronized atomic reads and subsequent sets with atomic_long_xchg() in the periodic timer handler can_stat_update(). This reachable code is in the core network CAN subsystem and accessible via procfs (/proc/net/can/*) and virtual CAN interfaces.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"CAN",
"PROC_FS",
"CAN_RAW",
"CAN_VCAN"
],
"FocusSymbols": [
"can_stat_update",
"can_init_stats",
"can_reset_stats_proc_show",
"can_stats_proc_show"
],
"Reasoning": "The patch modifies CAN network layer statistics handling in net/can/proc.c. It replaces a bulk memset with explicit atomic and member zeroing in can_reset_pkg_stats(), and replaces unsynchronized atomic reads and subsequent sets with atomic_long_xchg() in the periodic timer handler can_stat_update(). This reachable code is in the core network CAN subsystem and accessible via procfs (/proc/net/can/*) and virtual CAN interfaces.",
"WorthFuzzing": true
} |
| 41/1 | 2026/10/16 18:14 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 42/2 | 2026/10/16 18:14 | agent | kmsan-evaluator |
0mModel:core Args: null Results: {
"KMSANReasoning": "The patch refactors the statistics reset in net/can/proc.c by replacing memset with an explicit can_reset_pkg_stats() helper and uses atomic_long_xchg() to atomically fetch and clear the delta statistics. The underlying structure (net-\u003ecan.pkg_stats) is initially allocated using kzalloc_obj(), and can_reset_pkg_stats() explicitly zeros every member of struct can_pkg_stats (with jiffies_init initialized immediately afterward). Furthermore, these statistics are only formatted as ASCII text for procfs via seq_printf, and no raw structs are copied to user space. There is no risk of uninitialized memory reads or information leaks, making a dedicated KMSAN session unnecessary.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit d5e6da92b4ee908929a542dd9980deab1288bdd2
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Oct 16 18:11:51 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/can/proc.c b/net/can/proc.c
index de4d05ae34597..70104f13077e0 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -76,16 +76,39 @@ static const char rx_list_name[][8] = {
* af_can statistics stuff
*/
+static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)
+{
+ atomic_long_set(&pkg_stats->rx_frames, 0);
+ atomic_long_set(&pkg_stats->tx_frames, 0);
+ atomic_long_set(&pkg_stats->matches, 0);
+
+ pkg_stats->total_rx_rate = 0;
+ pkg_stats->total_tx_rate = 0;
+ pkg_stats->total_rx_match_ratio = 0;
+
+ pkg_stats->current_rx_rate = 0;
+ pkg_stats->current_tx_rate = 0;
+ pkg_stats->current_rx_match_ratio = 0;
+
+ pkg_stats->max_rx_rate = 0;
+ pkg_stats->max_tx_rate = 0;
+ pkg_stats->max_rx_match_ratio = 0;
+
+ atomic_long_set(&pkg_stats->rx_frames_delta, 0);
+ atomic_long_set(&pkg_stats->tx_frames_delta, 0);
+ atomic_long_set(&pkg_stats->matches_delta, 0);
+}
+
static void can_init_stats(struct net *net)
{
struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
/*
- * This memset function is called from a timer context (when
+ * This stats reset is called from a timer context (when
* can_stattimer is active which is the default) OR in a process
* context (reading the proc_fs when can_stattimer is disabled).
*/
- memset(pkg_stats, 0, sizeof(struct can_pkg_stats));
+ can_reset_pkg_stats(pkg_stats);
pkg_stats->jiffies_init = jiffies;
rcv_lists_stats->stats_reset++;
@@ -121,9 +144,10 @@ void can_stat_update(struct timer_list *t)
long rx_frames = atomic_long_read(&pkg_stats->rx_frames);
long tx_frames = atomic_long_read(&pkg_stats->tx_frames);
long matches = atomic_long_read(&pkg_stats->matches);
- long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta);
- long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta);
- long matches_delta = atomic_long_read(&pkg_stats->matches_delta);
+ /* fetch and clear values for 'current rate' calculation */
+ long rx_frames_delta = atomic_long_xchg(&pkg_stats->rx_frames_delta, 0);
+ long tx_frames_delta = atomic_long_xchg(&pkg_stats->tx_frames_delta, 0);
+ long matches_delta = atomic_long_xchg(&pkg_stats->matches_delta, 0);
/* restart counting in timer context on user request */
if (user_reset)
@@ -172,11 +196,6 @@ void can_stat_update(struct timer_list *t)
if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio)
pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
- /* clear values for 'current rate' calculation */
- atomic_long_set(&pkg_stats->tx_frames_delta, 0);
- atomic_long_set(&pkg_stats->rx_frames_delta, 0);
- atomic_long_set(&pkg_stats->matches_delta, 0);
-
/* restart timer (one second) */
mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ));
}
|
| 43/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 3152 output: 20 thoughts: 589 Thoughts: **Patch Evaluation: `can_reset_pkg_stats` in `net/can/proc.c`** Alright, let's dive into this. The objective is to determine if this patch necessitates a dedicated Kernel Memory Sanitizer (KMSAN) session. My immediate impression is to scrutinize the code modifications carefully. The patch alters `net/can/proc.c`, specifically introducing a new function, `can_reset_pkg_stats`. My initial thought is to compare the before and after, to be certain that the reset function is correct. Before the patch, `memset(pkg_stats, 0, sizeof(struct can_pkg_stats))` was used. Now, a function call, `can_reset_pkg_stats(pkg_stats)` performs the reset. The new function explicitly zeroes each field within the `can_pkg_stats` structure. I see it uses `atomic_long_set` for the atomic variables and direct assignment for the others. The `can_init_stats` function calls this `can_reset_pkg_stats` function and adds a value to `stats_reset`. However, my gut tells me to be absolutely thorough. Before concluding, I need to verify that *every* member of the `struct can_pkg_stats` is indeed reset by this new function. I need to make *absolutely certain* that nothing is missed. I'll need to double check the struct definition itself, either with a quick `grepper` call or by reading the file containing the struct definition. If anything remains uninitialized, then we may need a KMSAN session. |
| 44/3 | 2026/10/16 18:14 | tool | grepper |
0mArgs:{
"Expression": "struct can_pkg_stats"
}Results: {
"Output": "include/net/netns/can.h=12=struct can_dev_rcv_lists;\ninclude/net/netns/can.h:13:struct can_pkg_stats;\ninclude/net/netns/can.h-14-struct can_rcv_lists_stats;\n--\ninclude/net/netns/can.h=16=struct netns_can {\n--\ninclude/net/netns/can.h-33-\tstruct timer_list stattimer; /* timer for statistics update */\ninclude/net/netns/can.h:34:\tstruct can_pkg_stats *pkg_stats;\ninclude/net/netns/can.h-35-\tstruct can_rcv_lists_stats *rcv_lists_stats;\n--\nnet/can/af_can.c=202=int can_send(struct sk_buff *skb, int loop)\n--\nnet/can/af_can.c-204-\tstruct sk_buff *newskb = NULL;\nnet/can/af_can.c:205:\tstruct can_pkg_stats *pkg_stats = dev_net(skb-\u003edev)-\u003ecan.pkg_stats;\nnet/can/af_can.c-206-\tint err = -EINVAL;\n--\nnet/can/af_can.c=651=static void can_receive(struct sk_buff *skb, struct net_device *dev)\n--\nnet/can/af_can.c-654-\tstruct net *net = dev_net(dev);\nnet/can/af_can.c:655:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/af_can.c-656-\tint matches;\n--\nnet/can/af_can.h=51=struct receiver {\n--\nnet/can/af_can.h-65-/* can be reset e.g. by can_init_stats() */\nnet/can/af_can.h:66:struct can_pkg_stats {\nnet/can/af_can.h-67-\tunsigned long jiffies_init;\n--\nnet/can/proc.c=68=static const char rx_list_name[][8] = {\n--\nnet/can/proc.c-78-\nnet/can/proc.c:79:static void can_reset_pkg_stats(struct can_pkg_stats *pkg_stats)\nnet/can/proc.c-80-{\n--\nnet/can/proc.c=102=static void can_init_stats(struct net *net)\nnet/can/proc.c-103-{\nnet/can/proc.c:104:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-105-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n--\nnet/can/proc.c=138=void can_stat_update(struct timer_list *t)\n--\nnet/can/proc.c-140-\tstruct net *net = timer_container_of(net, t, can.stattimer);\nnet/can/proc.c:141:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-142-\tunsigned long j = jiffies; /* snapshot */\n--\nnet/can/proc.c=235=static int can_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-237-\tstruct net *net = m-\u003eprivate;\nnet/can/proc.c:238:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-239-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n--\nnet/can/proc.c=300=static int can_reset_stats_proc_show(struct seq_file *m, void *v)\n--\nnet/can/proc.c-303-\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\nnet/can/proc.c:304:\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\nnet/can/proc.c-305-\n"
} |
| 45/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 5233 output: 36 thoughts: 42 Thoughts: Okay, here's my interpretation of those directives, structured as a first-person account of the thought process, assuming I'm already pretty familiar with CAN networking within the Linux kernel: **Delving into CAN Statistics in the Kernel** Alright, I need to get a handle on how CAN statistics are managed, specifically within the kernel. My initial thought is to dive into `net/can/af_can.h` around line 66. I figure that's a good starting point because that header file is likely to define the structures related to the CAN address family and associated data, which probably includes definitions for the relevant statistics counters. I want to see how the basic data structures are laid out. Next, I need to understand where these statistics are actually *populated* and *used*. That naturally leads me to `net/can/proc.c`. My hunch is that this file will handle the `/proc` interface for CAN, and given the context, I expect that `pkg_stats` is the name of the structure that contains the CAN statistics. I want to trace the allocation and usage of this structure. I need to figure out where and how these statistics are being incremented, displayed, and potentially reset. This should tell me the whole story of how the kernel gathers and reports on CAN traffic. |
| 46/3 | 2026/10/16 18:14 | tool | read-file |
0mArgs:{
"File": "net/can/af_can.h",
"FirstLine": 60,
"LineCount": 40
}Results: {
"Contents": " 60:\t\tstruct rcu_head rcu;\n 61:\t};\n 62:\t\n 63:\t/* statistic structures */\n 64:\t\n 65:\t/* can be reset e.g. by can_init_stats() */\n 66:\tstruct can_pkg_stats {\n 67:\t\tunsigned long jiffies_init;\n 68:\t\n 69:\t\tatomic_long_t rx_frames;\n 70:\t\tatomic_long_t tx_frames;\n 71:\t\tatomic_long_t matches;\n 72:\t\n 73:\t\tunsigned long total_rx_rate;\n 74:\t\tunsigned long total_tx_rate;\n 75:\t\tunsigned long total_rx_match_ratio;\n 76:\t\n 77:\t\tunsigned long current_rx_rate;\n 78:\t\tunsigned long current_tx_rate;\n 79:\t\tunsigned long current_rx_match_ratio;\n 80:\t\n 81:\t\tunsigned long max_rx_rate;\n 82:\t\tunsigned long max_tx_rate;\n 83:\t\tunsigned long max_rx_match_ratio;\n 84:\t\n 85:\t\tatomic_long_t rx_frames_delta;\n 86:\t\tatomic_long_t tx_frames_delta;\n 87:\t\tatomic_long_t matches_delta;\n 88:\t};\n 89:\t\n 90:\t/* persistent statistics */\n 91:\tstruct can_rcv_lists_stats {\n 92:\t\tunsigned long stats_reset;\n 93:\t\tunsigned long user_reset;\n 94:\t\tunsigned long rcv_entries;\n 95:\t\tunsigned long rcv_entries_max;\n 96:\t};\n 97:\t\n 98:\t/* function prototypes for the CAN networklayer procfs (proc.c) */\n 99:\tvoid can_init_proc(struct net *net);\n"
} |
| 47/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6086 output: 33 thoughts: 17 Thoughts: Okay, here's my summary, presented as a stream of thought: **Debugging the Package Stats Allocation** Alright, so I need to figure out the memory allocation of `pkg_stats`. I've got a hunch it's behaving unexpectedly, and I need to pinpoint where it's being created and initialized. The best first step here, given my experience, is to reach for a trusty tool like `grepper`. I'll use it to quickly search the codebase for where `pkg_stats` is defined, declared, and used. That should give me a good overview of its lifecycle and where I can start looking for the root cause of this memory issue. Hopefully it's quick to find. |
| 48/3 | 2026/10/16 18:14 | tool | grepper |
0mArgs:{
"Expression": "pkg_stats.*alloc|kzalloc",
"PathPrefixes": [
"net/can/"
]
}Results: {
"Output": "net/can/af_can.c=823=static int can_pernet_init(struct net *net)\n--\nnet/can/af_can.c-825-\tspin_lock_init(\u0026net-\u003ecan.rcvlists_lock);\nnet/can/af_can.c:826:\tnet-\u003ecan.rx_alldev_list = kzalloc_obj(*net-\u003ecan.rx_alldev_list);\nnet/can/af_can.c-827-\tif (!net-\u003ecan.rx_alldev_list)\nnet/can/af_can.c-828-\t\tgoto out;\nnet/can/af_can.c:829:\tnet-\u003ecan.pkg_stats = kzalloc_obj(*net-\u003ecan.pkg_stats);\nnet/can/af_can.c-830-\tif (!net-\u003ecan.pkg_stats)\nnet/can/af_can.c-831-\t\tgoto out_free_rx_alldev_list;\nnet/can/af_can.c:832:\tnet-\u003ecan.rcv_lists_stats = kzalloc_obj(*net-\u003ecan.rcv_lists_stats);\nnet/can/af_can.c-833-\tif (!net-\u003ecan.rcv_lists_stats)\n--\nnet/can/bcm.c=1071=static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,\n--\nnet/can/bcm.c-1169-\nnet/can/bcm.c:1170:\t\top = kzalloc(OPSIZ, GFP_KERNEL);\nnet/can/bcm.c-1171-\t\tif (!op)\n--\nnet/can/bcm.c-1226-\nnet/can/bcm.c:1227:\t\t/* initialize uninitialized (kzalloc) structure */\nnet/can/bcm.c-1228-\t\thrtimer_setup(\u0026op-\u003etimer, bcm_tx_timeout_handler, CLOCK_MONOTONIC,\n--\nnet/can/bcm.c=1314=static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,\n--\nnet/can/bcm.c-1417-\t\t/* insert new BCM operation for the given can_id */\nnet/can/bcm.c:1418:\t\top = kzalloc(OPSIZ, GFP_KERNEL);\nnet/can/bcm.c-1419-\t\tif (!op)\n--\nnet/can/bcm.c-1472-\nnet/can/bcm.c:1473:\t\t/* initialize uninitialized (kzalloc) structure */\nnet/can/bcm.c-1474-\t\thrtimer_setup(\u0026op-\u003etimer, bcm_rx_timeout_handler, CLOCK_MONOTONIC,\n--\nnet/can/j1939/bus.c=149=struct j1939_ecu *j1939_ecu_create_locked(struct j1939_priv *priv, name_t name)\n--\nnet/can/j1939/bus.c-154-\nnet/can/j1939/bus.c:155:\tecu = kzalloc_obj(*ecu, gfp_any());\nnet/can/j1939/bus.c-156-\tif (!ecu)\n--\nnet/can/j1939/main.c=127=static struct j1939_priv *j1939_priv_create(struct net_device *ndev)\n--\nnet/can/j1939/main.c-130-\nnet/can/j1939/main.c:131:\tpriv = kzalloc_obj(*priv);\nnet/can/j1939/main.c-132-\tif (!priv)\n--\nnet/can/j1939/transport.c=1517=static struct j1939_session *j1939_session_new(struct j1939_priv *priv,\n--\nnet/can/j1939/transport.c-1522-\nnet/can/j1939/transport.c:1523:\tsession = kzalloc_obj(*session, gfp_any());\nnet/can/j1939/transport.c-1524-\tif (!session)\n"
} |
| 49/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7416 output: 36 thoughts: 44 Thoughts: Okay, let's dive into this. **Investigating the CAN Statistics Display** Alright, to truly grasp how the system is presenting `pkg_stats` through the proc filesystem, and more importantly, where the initialization of `can_init_stats` is taking place, I need to get my hands dirty. I'm going to start by examining the code in `net/can/proc.c`, specifically focusing on lines 70 through 320. That seems like a reasonable range to get a good overview of the relevant logic. I'm looking to understand the mechanics of the proc interface for CAN statistics, how data is formatted and presented, and crucially, trace back the initialization pathway of the stat counters themselves. This should give me a solid understanding of the entire data lifecycle related to `pkg_stats` and will help me evaluate its structure and function. |
| 50/3 | 2026/10/16 18:14 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 100,
"LineCount": 100
}Results: {
"Contents": " 100:\t}\n 101:\t\n 102:\tstatic void can_init_stats(struct net *net)\n 103:\t{\n 104:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 105:\t\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n 106:\t\t/*\n 107:\t\t * This stats reset is called from a timer context (when\n 108:\t\t * can_stattimer is active which is the default) OR in a process\n 109:\t\t * context (reading the proc_fs when can_stattimer is disabled).\n 110:\t\t */\n 111:\t\tcan_reset_pkg_stats(pkg_stats);\n 112:\t\tpkg_stats-\u003ejiffies_init = jiffies;\n 113:\t\n 114:\t\trcv_lists_stats-\u003estats_reset++;\n 115:\t\n 116:\t\tif (user_reset) {\n 117:\t\t\tuser_reset = 0;\n 118:\t\t\trcv_lists_stats-\u003euser_reset++;\n 119:\t\t}\n 120:\t}\n 121:\t\n 122:\tstatic unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,\n 123:\t\t\t\t unsigned long count)\n 124:\t{\n 125:\t\tif (oldjif == newjif)\n 126:\t\t\treturn 0;\n 127:\t\n 128:\t\t/* see can_stat_update() - this should NEVER happen! */\n 129:\t\tif (count \u003e (ULONG_MAX / HZ)) {\n 130:\t\t\tprintk(KERN_ERR \"can: calc_rate: count exceeded! %ld\\n\",\n 131:\t\t\t count);\n 132:\t\t\treturn 99999999;\n 133:\t\t}\n 134:\t\n 135:\t\treturn (count * HZ) / (newjif - oldjif);\n 136:\t}\n 137:\t\n 138:\tvoid can_stat_update(struct timer_list *t)\n 139:\t{\n 140:\t\tstruct net *net = timer_container_of(net, t, can.stattimer);\n 141:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 142:\t\tunsigned long j = jiffies; /* snapshot */\n 143:\t\n 144:\t\tlong rx_frames = atomic_long_read(\u0026pkg_stats-\u003erx_frames);\n 145:\t\tlong tx_frames = atomic_long_read(\u0026pkg_stats-\u003etx_frames);\n 146:\t\tlong matches = atomic_long_read(\u0026pkg_stats-\u003ematches);\n 147:\t\t/* fetch and clear values for 'current rate' calculation */\n 148:\t\tlong rx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003erx_frames_delta, 0);\n 149:\t\tlong tx_frames_delta = atomic_long_xchg(\u0026pkg_stats-\u003etx_frames_delta, 0);\n 150:\t\tlong matches_delta = atomic_long_xchg(\u0026pkg_stats-\u003ematches_delta, 0);\n 151:\t\n 152:\t\t/* restart counting in timer context on user request */\n 153:\t\tif (user_reset)\n 154:\t\t\tcan_init_stats(net);\n 155:\t\n 156:\t\t/* restart counting on jiffies overflow */\n 157:\t\tif (j \u003c pkg_stats-\u003ejiffies_init)\n 158:\t\t\tcan_init_stats(net);\n 159:\t\n 160:\t\t/* prevent overflow in calc_rate() */\n 161:\t\tif (rx_frames \u003e (LONG_MAX / HZ))\n 162:\t\t\tcan_init_stats(net);\n 163:\t\n 164:\t\t/* prevent overflow in calc_rate() */\n 165:\t\tif (tx_frames \u003e (LONG_MAX / HZ))\n 166:\t\t\tcan_init_stats(net);\n 167:\t\n 168:\t\t/* matches overflow - very improbable */\n 169:\t\tif (matches \u003e (LONG_MAX / 100))\n 170:\t\t\tcan_init_stats(net);\n 171:\t\n 172:\t\t/* calc total values */\n 173:\t\tif (rx_frames)\n 174:\t\t\tpkg_stats-\u003etotal_rx_match_ratio = (matches * 100) / rx_frames;\n 175:\t\n 176:\t\tpkg_stats-\u003etotal_tx_rate = calc_rate(pkg_stats-\u003ejiffies_init, j,\n 177:\t\t\t\t\t\t tx_frames);\n 178:\t\tpkg_stats-\u003etotal_rx_rate = calc_rate(pkg_stats-\u003ejiffies_init, j,\n 179:\t\t\t\t\t\t rx_frames);\n 180:\t\n 181:\t\t/* calc current values */\n 182:\t\tif (rx_frames_delta)\n 183:\t\t\tpkg_stats-\u003ecurrent_rx_match_ratio =\n 184:\t\t\t\t(matches_delta * 100) /\trx_frames_delta;\n 185:\t\n 186:\t\tpkg_stats-\u003ecurrent_tx_rate = calc_rate(0, HZ, tx_frames_delta);\n 187:\t\tpkg_stats-\u003ecurrent_rx_rate = calc_rate(0, HZ, rx_frames_delta);\n 188:\t\n 189:\t\t/* check / update maximum values */\n 190:\t\tif (pkg_stats-\u003emax_tx_rate \u003c pkg_stats-\u003ecurrent_tx_rate)\n 191:\t\t\tpkg_stats-\u003emax_tx_rate = pkg_stats-\u003ecurrent_tx_rate;\n 192:\t\n 193:\t\tif (pkg_stats-\u003emax_rx_rate \u003c pkg_stats-\u003ecurrent_rx_rate)\n 194:\t\t\tpkg_stats-\u003emax_rx_rate = pkg_stats-\u003ecurrent_rx_rate;\n 195:\t\n 196:\t\tif (pkg_stats-\u003emax_rx_match_ratio \u003c pkg_stats-\u003ecurrent_rx_match_ratio)\n 197:\t\t\tpkg_stats-\u003emax_rx_match_ratio = pkg_stats-\u003ecurrent_rx_match_ratio;\n 198:\t\n 199:\t\t/* restart timer (one second) */\n"
} |
| 51/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9379 output: 35 thoughts: 25 Thoughts: Here's my take on the next step: **Diving into `net/can/proc.c`** Okay, so we've got a handle on the broader architecture. Now, to really understand the CAN subsystem's data collection and how it presents information, I need to get into the nitty-gritty. Let's dig into the details by reading lines 230 to 320 of `net/can/proc.c`. This section likely contains the core logic for the `/proc` interface specific to CAN. I'm hoping to find how the CAN data is formatted and exposed. This should provide some important context and help tie this back into the overall system design. |
| 52/3 | 2026/10/16 18:14 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 230,
"LineCount": 80
}Results: {
"Contents": " 230:\t\t\tseq_puts(m, \" device can_id can_mask function userdata matches ident\\n\");\n 231:\t\telse\n 232:\t\t\tseq_puts(m, \" device can_id can_mask function userdata matches ident\\n\");\n 233:\t}\n 234:\t\n 235:\tstatic int can_stats_proc_show(struct seq_file *m, void *v)\n 236:\t{\n 237:\t\tstruct net *net = m-\u003eprivate;\n 238:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 239:\t\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n 240:\t\n 241:\t\tseq_putc(m, '\\n');\n 242:\t\tseq_printf(m, \" %8ld transmitted frames (TXF)\\n\",\n 243:\t\t\t atomic_long_read(\u0026pkg_stats-\u003etx_frames));\n 244:\t\tseq_printf(m, \" %8ld received frames (RXF)\\n\",\n 245:\t\t\t atomic_long_read(\u0026pkg_stats-\u003erx_frames));\n 246:\t\tseq_printf(m, \" %8ld matched frames (RXMF)\\n\",\n 247:\t\t\t atomic_long_read(\u0026pkg_stats-\u003ematches));\n 248:\t\n 249:\t\tseq_putc(m, '\\n');\n 250:\t\n 251:\t\tif (net-\u003ecan.stattimer.function == can_stat_update) {\n 252:\t\t\tseq_printf(m, \" %8ld %% total match ratio (RXMR)\\n\",\n 253:\t\t\t\t\tpkg_stats-\u003etotal_rx_match_ratio);\n 254:\t\n 255:\t\t\tseq_printf(m, \" %8ld frames/s total tx rate (TXR)\\n\",\n 256:\t\t\t\t\tpkg_stats-\u003etotal_tx_rate);\n 257:\t\t\tseq_printf(m, \" %8ld frames/s total rx rate (RXR)\\n\",\n 258:\t\t\t\t\tpkg_stats-\u003etotal_rx_rate);\n 259:\t\n 260:\t\t\tseq_putc(m, '\\n');\n 261:\t\n 262:\t\t\tseq_printf(m, \" %8ld %% current match ratio (CRXMR)\\n\",\n 263:\t\t\t\t\tpkg_stats-\u003ecurrent_rx_match_ratio);\n 264:\t\n 265:\t\t\tseq_printf(m, \" %8ld frames/s current tx rate (CTXR)\\n\",\n 266:\t\t\t\t\tpkg_stats-\u003ecurrent_tx_rate);\n 267:\t\t\tseq_printf(m, \" %8ld frames/s current rx rate (CRXR)\\n\",\n 268:\t\t\t\t\tpkg_stats-\u003ecurrent_rx_rate);\n 269:\t\n 270:\t\t\tseq_putc(m, '\\n');\n 271:\t\n 272:\t\t\tseq_printf(m, \" %8ld %% max match ratio (MRXMR)\\n\",\n 273:\t\t\t\t\tpkg_stats-\u003emax_rx_match_ratio);\n 274:\t\n 275:\t\t\tseq_printf(m, \" %8ld frames/s max tx rate (MTXR)\\n\",\n 276:\t\t\t\t\tpkg_stats-\u003emax_tx_rate);\n 277:\t\t\tseq_printf(m, \" %8ld frames/s max rx rate (MRXR)\\n\",\n 278:\t\t\t\t\tpkg_stats-\u003emax_rx_rate);\n 279:\t\n 280:\t\t\tseq_putc(m, '\\n');\n 281:\t\t}\n 282:\t\n 283:\t\tseq_printf(m, \" %8ld current receive list entries (CRCV)\\n\",\n 284:\t\t\t\trcv_lists_stats-\u003ercv_entries);\n 285:\t\tseq_printf(m, \" %8ld maximum receive list entries (MRCV)\\n\",\n 286:\t\t\t\trcv_lists_stats-\u003ercv_entries_max);\n 287:\t\n 288:\t\tif (rcv_lists_stats-\u003estats_reset)\n 289:\t\t\tseq_printf(m, \"\\n %8ld statistic resets (STR)\\n\",\n 290:\t\t\t\t\trcv_lists_stats-\u003estats_reset);\n 291:\t\n 292:\t\tif (rcv_lists_stats-\u003euser_reset)\n 293:\t\t\tseq_printf(m, \" %8ld user statistic resets (USTR)\\n\",\n 294:\t\t\t\t\trcv_lists_stats-\u003euser_reset);\n 295:\t\n 296:\t\tseq_putc(m, '\\n');\n 297:\t\treturn 0;\n 298:\t}\n 299:\t\n 300:\tstatic int can_reset_stats_proc_show(struct seq_file *m, void *v)\n 301:\t{\n 302:\t\tstruct net *net = m-\u003eprivate;\n 303:\t\tstruct can_rcv_lists_stats *rcv_lists_stats = net-\u003ecan.rcv_lists_stats;\n 304:\t\tstruct can_pkg_stats *pkg_stats = net-\u003ecan.pkg_stats;\n 305:\t\n 306:\t\tuser_reset = 1;\n 307:\t\n 308:\t\tif (net-\u003ecan.stattimer.function == can_stat_update) {\n 309:\t\t\tseq_printf(m, \"Scheduled statistic reset #%ld.\\n\",\n"
} |
| 53/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11039 output: 35 thoughts: 35 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Investigating a Potential Bug Condition** Okay, so I'm digging into `can_reset_stats_proc_show` here. My thinking is, let's explore this conditional: `net->can.stattimer.function != can_stat_update`. It seems like we're looking for a specific state in the CAN interface, a state where the statistics update mechanism isn't what we expect it to be. The implication is that if this condition *isn't* met, then we potentially have a scenario where we can accurately reset the stats. But this implies that we need to examine where else `can_stat_update` is being handled in the codebase. My immediate thought is, if it's not the case then it's a good candidate for triggering a reset. I'll need to remember to check if any interrupts are causing this behavior. Understanding *why* this inequality holds is key; is it a race condition, an initialization issue, or something else entirely? A logical step will be to explore the surrounding code in this function to assess the logic here. I need to be sure that the subsequent function can handle the potential issues. I'll need to remember to keep in mind the potential implications of a stats reset under various operational conditions. |
| 54/3 | 2026/10/16 18:14 | tool | read-file |
0mArgs:{
"File": "net/can/proc.c",
"FirstLine": 310,
"LineCount": 30
}Results: {
"Contents": " 310:\t\t\t\t\trcv_lists_stats-\u003estats_reset + 1);\n 311:\t\t} else {\n 312:\t\t\tif (pkg_stats-\u003ejiffies_init != jiffies)\n 313:\t\t\t\tcan_init_stats(net);\n 314:\t\n 315:\t\t\tseq_printf(m, \"Performed statistic reset #%ld.\\n\",\n 316:\t\t\t\t\trcv_lists_stats-\u003estats_reset);\n 317:\t\t}\n 318:\t\treturn 0;\n 319:\t}\n 320:\t\n 321:\tstatic inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,\n 322:\t\t\t\t\t\t struct net_device *dev,\n 323:\t\t\t\t\t\t struct can_dev_rcv_lists *dev_rcv_lists)\n 324:\t{\n 325:\t\tif (!hlist_empty(\u0026dev_rcv_lists-\u003erx[idx])) {\n 326:\t\t\tcan_print_recv_banner(m);\n 327:\t\t\tcan_print_rcvlist(m, \u0026dev_rcv_lists-\u003erx[idx], dev);\n 328:\t\t} else\n 329:\t\t\tseq_printf(m, \" (%s: no entry)\\n\", DNAME(dev));\n 330:\t\n 331:\t}\n 332:\t\n 333:\tstatic int can_rcvlist_proc_show(struct seq_file *m, void *v)\n 334:\t{\n 335:\t\t/* double cast to prevent GCC warning */\n 336:\t\tint idx = (int)(long)pde_data(m-\u003efile-\u003ef_inode);\n 337:\t\tstruct net_device *dev;\n 338:\t\tstruct can_dev_rcv_lists *dev_rcv_lists;\n 339:\t\tstruct net *net = m-\u003eprivate;\n"
} |
| 55/3 | 2026/10/16 18:14 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11903 output: 176 thoughts: 1793 Thoughts: **Analyzing the CAN Packet Statistics Reset** Okay, let's break this down. This commit replaces a `memset` on `can_pkg_stats` with a dedicated `can_reset_pkg_stats` function. The rationale immediately jumps out: `memset` on a structure containing `atomic_long_t` members is inherently problematic. It can lead to races or violate the atomic abstraction, potentially corrupting concurrent atomic increments. The patch itself is straightforward. `can_reset_pkg_stats` explicitly sets all the statistical fields to zero: the atomic frame counters, the rate variables, and the delta values. Examining the `can_pkg_stats` struct definition in `af_can.h` confirms that *every* field is now properly initialized to zero or explicitly assigned a zero value. This includes the delta values which now use `atomic_long_xchg` to atomically read and clear them, solving a data loss issue that existed previously between the read and zeroing of these deltas. Now, to assess whether this introduces any uninitialized memory risks, I need to thoroughly consider the usage of `pkg_stats`. The struct is allocated via `kzalloc_obj`, so it's initially zeroed. Subsequent resets with `can_reset_pkg_stats` maintain this initial state. Crucially, the data is *only* formatted into procfs text using `seq_printf`. There are no raw byte copies, `copy_to_user` operations, or transmission of the structure directly to userspace. No uninitialized variables or struct fields are read or exposed. Based on this analysis, and considering the KMSAN rules: 1. There are no structures sent to user space where uninitialized fields could be a problem. 2. No conditional logic depends on potentially uninitialized variables. 3. The data structure is fully initialized and zeroed. 4. There's no risk of reading uninitialized bytes from existing buffers. This is fundamentally a concurrency fix, specifically addressing data races on atomic types. This patch *does not* introduce any risk of uninitialized memory usage or information leaks. Thus, `NeedsKMSAN = false`. I'm confident in setting this flag. I'll proceed to use the `set-results` tool now. |
| 56/3 | 2026/10/16 18:15 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch refactors the statistics reset in net/can/proc.c by replacing memset with an explicit can_reset_pkg_stats() helper and uses atomic_long_xchg() to atomically fetch and clear the delta statistics. The underlying structure (net-\u003ecan.pkg_stats) is initially allocated using kzalloc_obj(), and can_reset_pkg_stats() explicitly zeros every member of struct can_pkg_stats (with jiffies_init initialized immediately afterward). Furthermore, these statistics are only formatted as ASCII text for procfs via seq_printf, and no raw structs are copied to user space. There is no risk of uninitialized memory reads or information leaks, making a dedicated KMSAN session unnecessary.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch refactors the statistics reset in net/can/proc.c by replacing memset with an explicit can_reset_pkg_stats() helper and uses atomic_long_xchg() to atomically fetch and clear the delta statistics. The underlying structure (net-\u003ecan.pkg_stats) is initially allocated using kzalloc_obj(), and can_reset_pkg_stats() explicitly zeros every member of struct can_pkg_stats (with jiffies_init initialized immediately afterward). Furthermore, these statistics are only formatted as ASCII text for procfs via seq_printf, and no raw structs are copied to user space. There is no risk of uninitialized memory reads or information leaks, making a dedicated KMSAN session unnecessary.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|