| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/21 08:42 | flow | patch-triage |
2mArgs:null Results: {
"EnableConfigs": [
"SMC",
"SMC_DIAG",
"INFINIBAND",
"DIBS"
],
"FocusSymbols": [
"smc_release",
"smc_clcsock_release",
"smc_unhash_sk"
],
"KMSANReasoning": "The patch fixes a race condition during socket destruction where `smc_diag` dumps could dereference `smc-\u003eclcsock` while it is being released. This is a use-after-free or NULL pointer dereference bug, which is effectively caught by KASAN. The patch does not introduce any new allocations, does not copy data to user space, and does not alter bounds checking or data length calculations. There is no risk of uninitialized memory usage or info-leaks introduced by these changes.",
"NeedsKMSAN": false,
"Reasoning": "The patch fixes a race condition during SMC socket destruction where smc_diag dumps could dereference a released clcsock. It modifies the socket teardown flow by adding a .destroy callback to smc_inet_prot and smc_inet6_prot, which unhashes the socket before releasing the clcsock. This is a functional change in core networking code that is reachable and should be fuzzed.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/21 08:42 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 262a5dd0f8b41a88f92671fd5525ce7faa38a11e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Aug 21 08:42:28 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c\nindex a94084b4a498e..520b666fdd8fa 100644\n--- a/net/smc/smc_inet.c\n+++ b/net/smc/smc_inet.c\n@@ -15,13 +15,16 @@\n \n #include \"smc_inet.h\"\n #include \"smc.h\"\n+#include \"smc_close.h\"\n \n static int smc_inet_init_sock(struct sock *sk);\n+static void smc_inet_destroy_sock(struct sock *sk);\n \n static struct proto smc_inet_prot = {\n \t.name\t\t= \"INET_SMC\",\n \t.owner\t\t= THIS_MODULE,\n \t.init\t\t= smc_inet_init_sock,\n+\t.destroy\t= smc_inet_destroy_sock,\n \t.hash\t\t= smc_hash_sk,\n \t.unhash\t\t= smc_unhash_sk,\n \t.release_cb\t= smc_release_cb,\n@@ -68,6 +71,7 @@ static struct proto smc_inet6_prot = {\n \t.name\t\t= \"INET6_SMC\",\n \t.owner\t\t= THIS_MODULE,\n \t.init\t\t= smc_inet_init_sock,\n+\t.destroy\t= smc_inet_destroy_sock,\n \t.hash\t\t= smc_hash_sk,\n \t.unhash\t\t= smc_unhash_sk,\n \t.release_cb\t= smc_release_cb,\n@@ -116,6 +120,18 @@ static int smc_inet_init_sock(struct sock *sk)\n \treturn smc_create_clcsk(net, sk, sk-\u003esk_family);\n }\n \n+static void smc_inet_destroy_sock(struct sock *sk)\n+{\n+\t/* The sock is hashed and smc_diag dumps dereference smc-\u003eclcsock\n+\t * without clcsock_release_lock, while sk_common_release() calls\n+\t * .destroy before .unhash. Unhash first, as __smc_release() does,\n+\t * so no dump can observe the clcsock being released; the second\n+\t * unhash is a no-op.\n+\t */\n+\tsk-\u003esk_prot-\u003eunhash(sk);\n+\tsmc_clcsock_release(smc_sk(sk));\n+}\n+\n int __init smc_inet_init(void)\n {\n \tint rc;\n"
} |
| 2/1 | 2026/08/21 08:42 | agent | patch-evaluator |
2mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"SMC",
"SMC_DIAG",
"INFINIBAND",
"DIBS"
],
"FocusSymbols": [
"smc_release",
"smc_clcsock_release",
"smc_unhash_sk"
],
"Reasoning": "The patch fixes a race condition during SMC socket destruction where smc_diag dumps could dereference a released clcsock. It modifies the socket teardown flow by adding a .destroy callback to smc_inet_prot and smc_inet6_prot, which unhashes the socket before releasing the clcsock. This is a functional change in core networking code that is reachable and should be fuzzed.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a '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: For your convenience, here is the diff of the changes:
commit 262a5dd0f8b41a88f92671fd5525ce7faa38a11e
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Aug 21 08:42:28 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
index a94084b4a498e..520b666fdd8fa 100644
--- a/net/smc/smc_inet.c
+++ b/net/smc/smc_inet.c
@@ -15,13 +15,16 @@
#include "smc_inet.h"
#include "smc.h"
+#include "smc_close.h"
static int smc_inet_init_sock(struct sock *sk);
+static void smc_inet_destroy_sock(struct sock *sk);
static struct proto smc_inet_prot = {
.name = "INET_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
+ .destroy = smc_inet_destroy_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
@@ -68,6 +71,7 @@ static struct proto smc_inet6_prot = {
.name = "INET6_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
+ .destroy = smc_inet_destroy_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
@@ -116,6 +120,18 @@ static int smc_inet_init_sock(struct sock *sk)
return smc_create_clcsk(net, sk, sk->sk_family);
}
+static void smc_inet_destroy_sock(struct sock *sk)
+{
+ /* The sock is hashed and smc_diag dumps dereference smc->clcsock
+ * without clcsock_release_lock, while sk_common_release() calls
+ * .destroy before .unhash. Unhash first, as __smc_release() does,
+ * so no dump can observe the clcsock being released; the second
+ * unhash is a no-op.
+ */
+ sk->sk_prot->unhash(sk);
+ smc_clcsock_release(smc_sk(sk));
+}
+
int __init smc_inet_init(void)
{
int rc;
|
| 3/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2440 output: 22 thoughts: 154 Thoughts: **Analyzing the SMC Inet Patch** Okay, so I'm looking at this patch for `net/smc/smc_inet.c`. It looks like we're adding a `.destroy` callback to both `smc_inet_prot` and `smc_inet6_prot`. That's interesting, and the callback itself is `smc_inet_destroy_sock`. I know that function – it's responsible for unhashing the socket and then calling `smc_clcsock_release`. Makes sense; cleanup is crucial, especially in this area. Now, before I sign off on this, I need to understand the implications better. I'll need to dig into `net/smc/smc_inet.c` and also check `net/smc/smc.h` to see if there are any new configuration dependencies or potential conflicts. Time to fire up `grepper` and search for instances of `smc_inet_prot`, `smc_inet6_prot`, and that destruction function, `smc_inet_destroy_sock`. I need to ensure this change integrates cleanly and doesn't introduce any unexpected behavior. I'll be looking for cross-references, any potential locking issues, and how these changes impact the overall lifecycle of these sockets. Let's see what the grep reveals. |
| 4/2 | 2026/08/21 08:42 | tool | grepper |
0mArgs:{
"Expression": "smc_inet_destroy_sock"
}Results: {
"Output": "net/smc/smc_inet.c=20=static int smc_inet_init_sock(struct sock *sk);\nnet/smc/smc_inet.c:21:static void smc_inet_destroy_sock(struct sock *sk);\nnet/smc/smc_inet.c-22-\nnet/smc/smc_inet.c=23=static struct proto smc_inet_prot = {\n--\nnet/smc/smc_inet.c-26-\t.init\t\t= smc_inet_init_sock,\nnet/smc/smc_inet.c:27:\t.destroy\t= smc_inet_destroy_sock,\nnet/smc/smc_inet.c-28-\t.hash\t\t= smc_hash_sk,\n--\nnet/smc/smc_inet.c=70=static struct proto smc_inet6_prot = {\n--\nnet/smc/smc_inet.c-73-\t.init\t\t= smc_inet_init_sock,\nnet/smc/smc_inet.c:74:\t.destroy\t= smc_inet_destroy_sock,\nnet/smc/smc_inet.c-75-\t.hash\t\t= smc_hash_sk,\n--\nnet/smc/smc_inet.c=113=static int smc_inet_init_sock(struct sock *sk)\n--\nnet/smc/smc_inet.c-122-\nnet/smc/smc_inet.c:123:static void smc_inet_destroy_sock(struct sock *sk)\nnet/smc/smc_inet.c-124-{\n"
} |
| 5/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3337 output: 29 thoughts: 10 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience: **Hunting Down the SMC Kconfig** Alright, so the task at hand is definitely centered around the SMC. My immediate thought is, "Where's the Kconfig for it?" I know the architecture, the kernel build system and its configuration options are key, especially when dealing with something as specific as an SMC, or System Management Controller. It's almost guaranteed to have its own Kconfig fragment to control compilation and configuration. So, my mental checklist begins: I need to locate this file to understand the available options, dependencies, and ultimately, how to enable or disable the SMC support within the build. Time to track that down. |
| 6/2 | 2026/08/21 08:42 | tool | grepper |
0mArgs:{
"Expression": "config SMC",
"PathPrefix": "net/smc/Kconfig"
}Results: {
"Output": "net/smc/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/smc/Kconfig:2:config SMC\nnet/smc/Kconfig-3-\ttristate \"SMC socket protocol family\"\n--\nnet/smc/Kconfig-13-\nnet/smc/Kconfig:14:config SMC_DIAG\nnet/smc/Kconfig-15-\ttristate \"SMC: socket monitoring interface\"\n--\nnet/smc/Kconfig-22-\nnet/smc/Kconfig:23:config SMC_HS_CTRL_BPF\nnet/smc/Kconfig-24-\tbool \"Generic eBPF hook for SMC handshake flow\"\n"
} |
| 7/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3713 output: 22 thoughts: 238 Thoughts: **Analyzing a Kernel Socket Patch** Okay, so the configuration is `SMC`, which immediately narrows the scope a bit. This patch addresses a race condition. Specifically, `smc_diag` was dereferencing `smc->clcsock` without first obtaining the `clcsock_release_lock`. That's a classic concurrency bug, definitely something to address. The fix introduces `smc_inet_destroy_sock`, which, if I understand this correctly, essentially cleans up the socket by calling `sk->sk_prot->unhash(sk)` and then `smc_clcsock_release(smc_sk(sk))`. Interesting, a functional change in socket teardown, which screams "fuzz this area!" to me. Now, `smc_inet_destroy_sock` is declared `static`, which is frustrating. Can't directly target it. Let me see... I could fuzz `smc_release`, `smc_clcsock_release` or `smc_inet_init_sock`. No, wait... `smc_inet_destroy_sock` is called from `sk_common_release`. Hang on, `sk_common_release` is called by `smc_release`, which is the entry point. But `smc_inet_prot.destroy` is called by `sk_common_release`. Got it. That means I need to focus on `smc_clcsock_release`. Let's dig deeper into that one... |
| 8/2 | 2026/08/21 08:42 | tool | grepper |
0mArgs:{
"Expression": "smc_clcsock_release"
}Results: {
"Output": "net/smc/af_smc.c=288=static int __smc_release(struct smc_sock *smc)\n--\nnet/smc/af_smc.c-317-\t\t\trelease_sock(sk);\nnet/smc/af_smc.c:318:\t\t\tsmc_clcsock_release(smc);\nnet/smc/af_smc.c-319-\t\t\tlock_sock(sk);\n--\nnet/smc/af_smc.c=3353=int smc_create_clcsk(struct net *net, struct sock *sk, int family)\n--\nnet/smc/af_smc.c-3362-\nnet/smc/af_smc.c:3363:\t/* smc_clcsock_release() does not wait smc-\u003eclcsock-\u003esk's\nnet/smc/af_smc.c-3364-\t * destruction; its sk_state might not be TCP_CLOSE after\n--\nnet/smc/smc_close.c-23-/* release the clcsock that is assigned to the smc_sock */\nnet/smc/smc_close.c:24:void smc_clcsock_release(struct smc_sock *smc)\nnet/smc/smc_close.c-25-{\n--\nnet/smc/smc_close.c=128=void smc_close_active_abort(struct smc_sock *smc)\n--\nnet/smc/smc_close.c-181-\t\trelease_sock(sk);\nnet/smc/smc_close.c:182:\t\tsmc_clcsock_release(smc);\nnet/smc/smc_close.c-183-\t\tlock_sock(sk);\n--\nnet/smc/smc_close.c=356=static void smc_close_passive_work(struct work_struct *work)\n--\nnet/smc/smc_close.c-442-\tif (release_clcsock)\nnet/smc/smc_close.c:443:\t\tsmc_clcsock_release(smc);\nnet/smc/smc_close.c-444-\tsock_put(sk); /* sock_hold done by schedulers of close_work */\n--\nnet/smc/smc_close.h=25=void smc_close_init(struct smc_sock *smc);\nnet/smc/smc_close.h:26:void smc_clcsock_release(struct smc_sock *smc);\nnet/smc/smc_close.h-27-int smc_close_abort(struct smc_connection *conn);\n--\nnet/smc/smc_inet.c=123=static void smc_inet_destroy_sock(struct sock *sk)\n--\nnet/smc/smc_inet.c-131-\tsk-\u003esk_prot-\u003eunhash(sk);\nnet/smc/smc_inet.c:132:\tsmc_clcsock_release(smc_sk(sk));\nnet/smc/smc_inet.c-133-}\n"
} |
| 9/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5115 output: 18 thoughts: 82 Thoughts: Okay, here's my take on those thoughts, framed as my own reasoning: **Analyzing the SMC Socket Release Flow** Right, this patch is digging into the SMC socket implementation, specifically the release mechanisms. The core configuration parameter here is obviously `SMC`. My immediate focus needs to be on the `smc_clcsock_release` and `smc_release` functions. Those are clearly the critical points for socket cleanup. Wait a second… I see `smc_inet_destroy_sock` is called from `sk_common_release` which *itself* is called from `smc_release`. That's important. It suggests a more complex chain of events than I initially assumed. It's not just a direct call; we're dealing with a common socket release path that's being leveraged. I need to understand that. So, let me get a clear picture by examining `smc_release` more closely and trace the execution path from there. This nested function call could explain some of the issues raised in this patch. |
| 10/2 | 2026/08/21 08:42 | tool | grepper |
0mArgs:{
"Expression": "smc_release"
}Results: {
"Output": "drivers/hwmon/applesmc.c=1054=static int applesmc_create_accelerometer(void)\n--\ndrivers/hwmon/applesmc.c-1106-/* Release all resources used by the accelerometer */\ndrivers/hwmon/applesmc.c:1107:static void applesmc_release_accelerometer(void)\ndrivers/hwmon/applesmc.c-1108-{\n--\ndrivers/hwmon/applesmc.c=1115=static int applesmc_create_light_sensor(void)\n--\ndrivers/hwmon/applesmc.c-1121-\ndrivers/hwmon/applesmc.c:1122:static void applesmc_release_light_sensor(void)\ndrivers/hwmon/applesmc.c-1123-{\n--\ndrivers/hwmon/applesmc.c=1129=static int applesmc_create_key_backlight(void)\n--\ndrivers/hwmon/applesmc.c-1138-\ndrivers/hwmon/applesmc.c:1139:static void applesmc_release_key_backlight(void)\ndrivers/hwmon/applesmc.c-1140-{\n--\ndrivers/hwmon/applesmc.c=1418=static int __init applesmc_init(void)\n--\ndrivers/hwmon/applesmc.c-1564-out_light_ledclass:\ndrivers/hwmon/applesmc.c:1565:\tapplesmc_release_key_backlight();\ndrivers/hwmon/applesmc.c-1566-out_light_sysfs:\ndrivers/hwmon/applesmc.c:1567:\tapplesmc_release_light_sensor();\ndrivers/hwmon/applesmc.c-1568-out_accelerometer:\ndrivers/hwmon/applesmc.c:1569:\tapplesmc_release_accelerometer();\ndrivers/hwmon/applesmc.c-1570-out_info:\n--\ndrivers/hwmon/applesmc.c=1586=static void __exit applesmc_exit(void)\n--\ndrivers/hwmon/applesmc.c-1588-\thwmon_device_unregister(hwmon_dev);\ndrivers/hwmon/applesmc.c:1589:\tapplesmc_release_key_backlight();\ndrivers/hwmon/applesmc.c:1590:\tapplesmc_release_light_sensor();\ndrivers/hwmon/applesmc.c:1591:\tapplesmc_release_accelerometer();\ndrivers/hwmon/applesmc.c-1592-\tapplesmc_destroy_nodes(info_group);\n--\ndrivers/net/ethernet/smsc/smc91x.c=2110=static int smc_request_attrib(struct platform_device *pdev,\n--\ndrivers/net/ethernet/smsc/smc91x.c-2124-\ndrivers/net/ethernet/smsc/smc91x.c:2125:static void smc_release_attrib(struct platform_device *pdev,\ndrivers/net/ethernet/smsc/smc91x.c-2126-\t\t\t struct net_device *ndev)\n--\ndrivers/net/ethernet/smsc/smc91x.c=2135=static inline void smc_request_datacs(struct platform_device *pdev, struct net_device *ndev)\n--\ndrivers/net/ethernet/smsc/smc91x.c-2153-\ndrivers/net/ethernet/smsc/smc91x.c:2154:static void smc_release_datacs(struct platform_device *pdev, struct net_device *ndev)\ndrivers/net/ethernet/smsc/smc91x.c-2155-{\n--\ndrivers/net/ethernet/smsc/smc91x.c=2227=static int smc_drv_probe(struct platform_device *pdev)\n--\ndrivers/net/ethernet/smsc/smc91x.c-2391- out_release_attrib:\ndrivers/net/ethernet/smsc/smc91x.c:2392:\tsmc_release_attrib(pdev, ndev);\ndrivers/net/ethernet/smsc/smc91x.c-2393- out_release_io:\n--\ndrivers/net/ethernet/smsc/smc91x.c=2403=static void smc_drv_remove(struct platform_device *pdev)\n--\ndrivers/net/ethernet/smsc/smc91x.c-2418-\ndrivers/net/ethernet/smsc/smc91x.c:2419:\tsmc_release_datacs(pdev,ndev);\ndrivers/net/ethernet/smsc/smc91x.c:2420:\tsmc_release_attrib(pdev,ndev);\ndrivers/net/ethernet/smsc/smc91x.c-2421-\n--\nnet/smc/af_smc.c=214=void smc_unhash_sk(struct sock *sk)\n--\nnet/smc/af_smc.c-227- */\nnet/smc/af_smc.c:228:void smc_release_cb(struct sock *sk)\nnet/smc/af_smc.c-229-{\n--\nnet/smc/af_smc.c=238=struct proto smc_proto = {\n--\nnet/smc/af_smc.c-243-\t.unhash\t\t= smc_unhash_sk,\nnet/smc/af_smc.c:244:\t.release_cb\t= smc_release_cb,\nnet/smc/af_smc.c-245-\t.obj_size\t= sizeof(struct smc_sock),\n--\nnet/smc/af_smc.c=251=struct proto smc_proto6 = {\n--\nnet/smc/af_smc.c-256-\t.unhash\t\t= smc_unhash_sk,\nnet/smc/af_smc.c:257:\t.release_cb\t= smc_release_cb,\nnet/smc/af_smc.c-258-\t.obj_size\t= sizeof(struct smc_sock),\n--\nnet/smc/af_smc.c=279=static void smc_restore_fallback_changes(struct smc_sock *smc)\n--\nnet/smc/af_smc.c-287-\nnet/smc/af_smc.c:288:static int __smc_release(struct smc_sock *smc)\nnet/smc/af_smc.c-289-{\n--\nnet/smc/af_smc.c-327-\nnet/smc/af_smc.c:328:int smc_release(struct socket *sock)\nnet/smc/af_smc.c-329-{\n--\nnet/smc/af_smc.c-360-\nnet/smc/af_smc.c:361:\trc = __smc_release(smc);\nnet/smc/af_smc.c-362-\n--\nnet/smc/af_smc.c=700=static void smc_conn_save_peer_info_fce(struct smc_sock *smc,\n--\nnet/smc/af_smc.c-720-\tsmc-\u003econn.lgr-\u003epeer_os = fce-\u003eos_type;\nnet/smc/af_smc.c:721:\tsmc-\u003econn.lgr-\u003epeer_smc_release = fce-\u003erelease;\nnet/smc/af_smc.c-722-\tif (smc_isascii(fce-\u003ehostname))\n--\nnet/smc/af_smc.c=1857=void smc_close_non_accepted(struct sock *sk)\n--\nnet/smc/af_smc.c-1865-\t\tWRITE_ONCE(sk-\u003esk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);\nnet/smc/af_smc.c:1866:\t__smc_release(smc);\nnet/smc/af_smc.c-1867-\trelease_sock(sk);\n--\nnet/smc/af_smc.c=3332=static const struct proto_ops smc_sock_ops = {\n--\nnet/smc/af_smc.c-3334-\t.owner\t\t= THIS_MODULE,\nnet/smc/af_smc.c:3335:\t.release\t= smc_release,\nnet/smc/af_smc.c-3336-\t.bind\t\t= smc_bind,\n--\nnet/smc/smc.h=41=void smc_unhash_sk(struct sock *sk);\nnet/smc/smc.h:42:void smc_release_cb(struct sock *sk);\nnet/smc/smc.h-43-\nnet/smc/smc.h:44:int smc_release(struct socket *sock);\nnet/smc/smc.h-45-int smc_bind(struct socket *sock, struct sockaddr_unsized *uaddr,\n--\nnet/smc/smc_cdc.c=26=static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,\n--\nnet/smc/smc_cdc.c-56-\t\t * User context will later try to send when it release sock_lock\nnet/smc/smc_cdc.c:57:\t\t * in smc_release_cb()\nnet/smc/smc_cdc.c-58-\t\t */\n--\nnet/smc/smc_close.c=356=static void smc_close_passive_work(struct work_struct *work)\n--\nnet/smc/smc_close.c-399-\t\t smc_close_sent_any_close(conn)) {\nnet/smc/smc_close.c:400:\t\t\t/* smc_release has already been called locally */\nnet/smc/smc_close.c-401-\t\t\tsk-\u003esk_state = SMC_CLOSED;\n--\nnet/smc/smc_core.c=309=static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr,\n--\nnet/smc/smc_core.c-318-\t\tgoto errv2attr;\nnet/smc/smc_core.c:319:\tif (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr-\u003epeer_smc_release))\nnet/smc/smc_core.c-320-\t\tgoto errv2attr;\n--\nnet/smc/smc_core.h=286=struct smc_link_group {\n--\nnet/smc/smc_core.h-312-\tu8\t\t\tpeer_os;\t/* peer operating system */\nnet/smc/smc_core.h:313:\tu8\t\t\tpeer_smc_release;\nnet/smc/smc_core.h-314-\tu8\t\t\tpeer_hostname[SMC_MAX_HOSTNAME_LEN];\n--\nnet/smc/smc_inet.c=23=static struct proto smc_inet_prot = {\n--\nnet/smc/smc_inet.c-29-\t.unhash\t\t= smc_unhash_sk,\nnet/smc/smc_inet.c:30:\t.release_cb\t= smc_release_cb,\nnet/smc/smc_inet.c-31-\t.obj_size\t= sizeof(struct smc_sock),\n--\nnet/smc/smc_inet.c=36=static const struct proto_ops smc_inet_stream_ops = {\n--\nnet/smc/smc_inet.c-38-\t.owner\t\t= THIS_MODULE,\nnet/smc/smc_inet.c:39:\t.release\t= smc_release,\nnet/smc/smc_inet.c-40-\t.bind\t\t= smc_bind,\n--\nnet/smc/smc_inet.c=70=static struct proto smc_inet6_prot = {\n--\nnet/smc/smc_inet.c-76-\t.unhash\t\t= smc_unhash_sk,\nnet/smc/smc_inet.c:77:\t.release_cb\t= smc_release_cb,\nnet/smc/smc_inet.c-78-\t.obj_size\t= sizeof(struct smc6_sock),\n--\nnet/smc/smc_inet.c=84=static const struct proto_ops smc_inet6_stream_ops = {\n--\nnet/smc/smc_inet.c-86-\t.owner\t\t= THIS_MODULE,\nnet/smc/smc_inet.c:87:\t.release\t= smc_release,\nnet/smc/smc_inet.c-88-\t.bind\t\t= smc_bind,\n--\nnet/smc/smc_inet.c=123=static void smc_inet_destroy_sock(struct sock *sk)\n--\nnet/smc/smc_inet.c-126-\t * without clcsock_release_lock, while sk_common_release() calls\nnet/smc/smc_inet.c:127:\t * .destroy before .unhash. Unhash first, as __smc_release() does,\nnet/smc/smc_inet.c-128-\t * so no dump can observe the clcsock being released; the second\n--\nnet/smc/smc_llc.c=447=int smc_llc_send_confirm_link(struct smc_link *link,\n--\nnet/smc/smc_llc.c-474-\tif (link-\u003elgr-\u003esmc_version == SMC_V2 \u0026\u0026\nnet/smc/smc_llc.c:475:\t link-\u003elgr-\u003epeer_smc_release \u003e= SMC_RELEASE_1) {\nnet/smc/smc_llc.c-476-\t\tconfllc-\u003emax_conns = link-\u003elgr-\u003emax_conns;\n--\ntools/testing/selftests/bpf/progs/bpf_smc.c=40=int fallback_cnt = 0;\ntools/testing/selftests/bpf/progs/bpf_smc.c-41-\ntools/testing/selftests/bpf/progs/bpf_smc.c:42:SEC(\"fentry/smc_release\")\ntools/testing/selftests/bpf/progs/bpf_smc.c:43:int BPF_PROG(bpf_smc_release, struct socket *sock)\ntools/testing/selftests/bpf/progs/bpf_smc.c-44-{\n"
} |
| 11/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9298 output: 20 thoughts: 116 Thoughts: **Focusing on SMC Socket Lifecycle** Okay, so I need to zero in on these functions: `smc_release`, `smc_clcsock_release`, and `smc_inet_init_sock`. These seem to be the critical pieces related to managing the SMC socket lifecycle. Hmm, but I should pause. I need to clarify something about the destruction process. I recall `smc_inet_destroy_sock` being called from `sk_common_release`. Now, is *that* called from `inet_release` or `inet6_release`? It's easy to get lost in these layers...No wait a minute, I need to remember the context. `smc_inet_prot` is the structure used for `AF_INET` sockets created with `IPPROTO_SMC`. Let me double-check `smc_inet_prot`, to make sure my understanding is correct and that it's handling the teardown as expected. I need to make sure that's how it is all connected. |
| 12/2 | 2026/08/21 08:42 | tool | grepper |
0mArgs:{
"Expression": "smc_inet_prot"
}Results: {
"Output": "net/smc/smc_inet.c=21=static void smc_inet_destroy_sock(struct sock *sk);\nnet/smc/smc_inet.c-22-\nnet/smc/smc_inet.c:23:static struct proto smc_inet_prot = {\nnet/smc/smc_inet.c-24-\t.name\t\t= \"INET_SMC\",\n--\nnet/smc/smc_inet.c=36=static const struct proto_ops smc_inet_stream_ops = {\n--\nnet/smc/smc_inet.c-56-\nnet/smc/smc_inet.c:57:static struct inet_protosw smc_inet_protosw = {\nnet/smc/smc_inet.c-58-\t.type\t\t= SOCK_STREAM,\nnet/smc/smc_inet.c-59-\t.protocol\t= IPPROTO_SMC,\nnet/smc/smc_inet.c:60:\t.prot\t\t= \u0026smc_inet_prot,\nnet/smc/smc_inet.c-61-\t.ops\t\t= \u0026smc_inet_stream_ops,\n--\nnet/smc/smc_inet.c=135=int __init smc_inet_init(void)\n--\nnet/smc/smc_inet.c-138-\nnet/smc/smc_inet.c:139:\trc = proto_register(\u0026smc_inet_prot, 1);\nnet/smc/smc_inet.c-140-\tif (rc) {\nnet/smc/smc_inet.c:141:\t\tpr_err(\"%s: proto_register smc_inet_prot fails with %d\\n\",\nnet/smc/smc_inet.c-142-\t\t __func__, rc);\n--\nnet/smc/smc_inet.c-145-\t/* no return value */\nnet/smc/smc_inet.c:146:\tinet_register_protosw(\u0026smc_inet_protosw);\nnet/smc/smc_inet.c-147-\n--\nnet/smc/smc_inet.c-164-out_inet6_prot:\nnet/smc/smc_inet.c:165:\tinet_unregister_protosw(\u0026smc_inet_protosw);\nnet/smc/smc_inet.c:166:\tproto_unregister(\u0026smc_inet_prot);\nnet/smc/smc_inet.c-167-#endif /* CONFIG_IPV6 */\n--\nnet/smc/smc_inet.c=171=void smc_inet_exit(void)\n--\nnet/smc/smc_inet.c-176-#endif /* CONFIG_IPV6 */\nnet/smc/smc_inet.c:177:\tinet_unregister_protosw(\u0026smc_inet_protosw);\nnet/smc/smc_inet.c:178:\tproto_unregister(\u0026smc_inet_prot);\nnet/smc/smc_inet.c-179-}\n"
} |
| 13/2 | 2026/08/21 08:42 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10456 output: 25 thoughts: 82 Thoughts: **Analyzing the SMC Socket Implementation** Okay, so I'm confirming that `smc_inet_prot` is indeed the protocol structure used for sockets employing `IPPROTO_SMC`. That's the first piece of the puzzle. Now, let's see... the `smc_inet_stream_ops` structure has a `.release` function pointer set to `smc_release`. That looks right, that's the expected structure. Hmm, but where is `smc_release` defined? Ah, yes, it’s in `af_smc.c`. Okay, good. It's time to dive into `af_smc.c` and take a closer look at the actual implementation of `smc_release`. Let's see what that function is doing. |
| 14/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "int smc_release\\(struct socket \\*sock\\)"
}Results: {
"Output": "net/smc/af_smc.c=288=static int __smc_release(struct smc_sock *smc)\n--\nnet/smc/af_smc.c-327-\nnet/smc/af_smc.c:328:int smc_release(struct socket *sock)\nnet/smc/af_smc.c-329-{\n--\nnet/smc/smc.h=42=void smc_release_cb(struct sock *sk);\nnet/smc/smc.h-43-\nnet/smc/smc.h:44:int smc_release(struct socket *sock);\nnet/smc/smc.h-45-int smc_bind(struct socket *sock, struct sockaddr_unsized *uaddr,\n"
} |
| 15/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10945 output: 36 thoughts: 76 Thoughts: Here's my summary, as though I'm thinking through this process: **Diving into the SMC Socket Release Mechanism** Okay, so `smc_release` is, as I recall, the function responsible for releasing a socket in the SMC (Shared Memory Communications) framework. The patch notes tell me it's adding a `.destroy` function pointer to both `smc_inet_prot` and `smc_inet6_prot`. My initial thought is, "Ah, right, a cleanup function." Now, the crucial question is *how* is this `.destroy` callback actually invoked? The patch references `sk_common_release`. My memory's fuzzy, but I'm pretty sure `sk_common_release` is part of the standard Linux networking stack, and it's used for releasing the common socket elements. And if I'm understanding this correctly, it's called by the general socket release function, which here is `smc_release`. But let's verify that. I'm going to quickly check the code for `smc_release` to confirm this sequence and ensure there isn't some other indirect path. I need to understand the exact point at which `.destroy` is called within the release process to fully grasp the patch's impact. |
| 16/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "sk_common_release",
"PathPrefix": "net/smc/af_smc.c"
}Results: {
"Output": "net/smc/af_smc.c=3373=static int smc_create(struct net *net, struct socket *sock, int protocol,\n--\nnet/smc/af_smc.c-3396-\tif (rc) {\nnet/smc/af_smc.c:3397:\t\tsk_common_release(sk);\nnet/smc/af_smc.c-3398-\t\tsock-\u003esk = NULL;\n"
} |
| 17/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11460 output: 36 thoughts: 31 Thoughts: Here's my thought process, as if I were the one thinking it: **Digging into Release Procedures** Okay, hold on a second. I was under the impression that `sk_common_release` was directly called by `smc_release`, but something feels off. I need to verify that connection. Let's not assume anything here, let's go straight to the source. Time to dig into the definition of `__smc_release` and see how the functions interact. I need to know the call stack. Let's see what's actually going on under the hood before making any assumptions about the release procedure. There might be some subtle differences from what I initially understood. |
| 18/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "__smc_release",
"PathPrefix": "net/smc/af_smc.c"
}Results: {
"Output": "net/smc/af_smc.c=279=static void smc_restore_fallback_changes(struct smc_sock *smc)\n--\nnet/smc/af_smc.c-287-\nnet/smc/af_smc.c:288:static int __smc_release(struct smc_sock *smc)\nnet/smc/af_smc.c-289-{\n--\nnet/smc/af_smc.c=328=int smc_release(struct socket *sock)\n--\nnet/smc/af_smc.c-360-\nnet/smc/af_smc.c:361:\trc = __smc_release(smc);\nnet/smc/af_smc.c-362-\n--\nnet/smc/af_smc.c=1857=void smc_close_non_accepted(struct sock *sk)\n--\nnet/smc/af_smc.c-1865-\t\tWRITE_ONCE(sk-\u003esk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);\nnet/smc/af_smc.c:1866:\t__smc_release(smc);\nnet/smc/af_smc.c-1867-\trelease_sock(sk);\n"
} |
| 19/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12020 output: 39 thoughts: 19 Thoughts: Here's your summary: **Deconstructing Socket Destruction: A Deep Dive into `__smc_release`** Alright, let's dive into this. The objective is clear: I need to understand exactly how the socket is being demolished. This means cracking open the `__smc_release` function and getting down to the nitty-gritty of its inner workings. I need to observe its precise steps in tearing down the connection. I'll be looking for things like memory deallocation, connection termination sequences, state resets, resource cleanup, and anything else that might contribute to a complete and clean shutdown. I'll look for how the kernel handles the potential for orphaned data or pending operations. I expect this will be where the magic happens, and a thorough analysis of this function will clarify the socket's lifecycle during its final moments. I need a clear mental picture of this process. |
| 20/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/smc/af_smc.c",
"FirstLine": 288,
"LineCount": 50
}Results: {
"Contents": " 288:\tstatic int __smc_release(struct smc_sock *smc)\n 289:\t{\n 290:\t\tstruct sock *sk = \u0026smc-\u003esk;\n 291:\t\tint rc = 0;\n 292:\t\n 293:\t\tif (!smc-\u003euse_fallback) {\n 294:\t\t\trc = smc_close_active(smc);\n 295:\t\t\tsmc_sock_set_flag(sk, SOCK_DEAD);\n 296:\t\t\tsk-\u003esk_shutdown |= SHUTDOWN_MASK;\n 297:\t\t} else {\n 298:\t\t\tif (sk-\u003esk_state != SMC_CLOSED) {\n 299:\t\t\t\tif (sk-\u003esk_state != SMC_LISTEN \u0026\u0026\n 300:\t\t\t\t sk-\u003esk_state != SMC_INIT)\n 301:\t\t\t\t\tsock_put(sk); /* passive closing */\n 302:\t\t\t\tif (sk-\u003esk_state == SMC_LISTEN) {\n 303:\t\t\t\t\t/* wake up clcsock accept */\n 304:\t\t\t\t\trc = kernel_sock_shutdown(smc-\u003eclcsock,\n 305:\t\t\t\t\t\t\t\t SHUT_RDWR);\n 306:\t\t\t\t}\n 307:\t\t\t\tsk-\u003esk_state = SMC_CLOSED;\n 308:\t\t\t\tsk-\u003esk_state_change(sk);\n 309:\t\t\t}\n 310:\t\t\tsmc_restore_fallback_changes(smc);\n 311:\t\t}\n 312:\t\n 313:\t\tsk-\u003esk_prot-\u003eunhash(sk);\n 314:\t\n 315:\t\tif (sk-\u003esk_state == SMC_CLOSED) {\n 316:\t\t\tif (smc-\u003eclcsock) {\n 317:\t\t\t\trelease_sock(sk);\n 318:\t\t\t\tsmc_clcsock_release(smc);\n 319:\t\t\t\tlock_sock(sk);\n 320:\t\t\t}\n 321:\t\t\tif (!smc-\u003euse_fallback)\n 322:\t\t\t\tsmc_conn_free(\u0026smc-\u003econn);\n 323:\t\t}\n 324:\t\n 325:\t\treturn rc;\n 326:\t}\n 327:\t\n 328:\tint smc_release(struct socket *sock)\n 329:\t{\n 330:\t\tstruct sock *sk = sock-\u003esk;\n 331:\t\tstruct smc_sock *smc;\n 332:\t\tint old_state, rc = 0;\n 333:\t\n 334:\t\tif (!sk)\n 335:\t\t\tgoto out;\n 336:\t\n 337:\t\tsock_hold(sk); /* sock_put below */\n"
} |
| 21/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12982 output: 38 thoughts: 183 Thoughts: **Analyzing the SMC Socket Release Mechanism** Okay, so I'm looking at this `__smc_release` function and it's calling `sk->sk_prot->unhash(sk)` and also `smc_clcsock_release(smc)`. My initial thought is to understand the context. The patch introduces a `.destroy` method into `smc_inet_prot` and `smc_inet6_prot`. I need to figure out if `__smc_release` even *uses* those inet protocols. Hang on. `__smc_release` is actually used for `smc_proto` and `smc_proto6`, which are for `AF_SMC` sockets. That makes sense. But the `smc_inet_prot` protocols are used for `IPPROTO_SMC` within `AF_INET` and `AF_INET6`. Okay, so `__smc_release` isn't directly related to what this patch is doing with those specific inet protocols. To clarify the relationships between the protocols and how they're released I'll check `smc_inet_prot` in `net/smc/smc_inet.c`. |
| 22/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/smc/smc_inet.c",
"FirstLine": 23,
"LineCount": 50
}Results: {
"Contents": " 23:\tstatic struct proto smc_inet_prot = {\n 24:\t\t.name\t\t= \"INET_SMC\",\n 25:\t\t.owner\t\t= THIS_MODULE,\n 26:\t\t.init\t\t= smc_inet_init_sock,\n 27:\t\t.destroy\t= smc_inet_destroy_sock,\n 28:\t\t.hash\t\t= smc_hash_sk,\n 29:\t\t.unhash\t\t= smc_unhash_sk,\n 30:\t\t.release_cb\t= smc_release_cb,\n 31:\t\t.obj_size\t= sizeof(struct smc_sock),\n 32:\t\t.h.smc_hash\t= \u0026smc_v4_hashinfo,\n 33:\t\t.slab_flags\t= SLAB_TYPESAFE_BY_RCU,\n 34:\t};\n 35:\t\n 36:\tstatic const struct proto_ops smc_inet_stream_ops = {\n 37:\t\t.family\t\t= PF_INET,\n 38:\t\t.owner\t\t= THIS_MODULE,\n 39:\t\t.release\t= smc_release,\n 40:\t\t.bind\t\t= smc_bind,\n 41:\t\t.connect\t= smc_connect,\n 42:\t\t.socketpair\t= sock_no_socketpair,\n 43:\t\t.accept\t\t= smc_accept,\n 44:\t\t.getname\t= smc_getname,\n 45:\t\t.poll\t\t= smc_poll,\n 46:\t\t.ioctl\t\t= smc_ioctl,\n 47:\t\t.listen\t\t= smc_listen,\n 48:\t\t.shutdown\t= smc_shutdown,\n 49:\t\t.setsockopt\t= smc_setsockopt,\n 50:\t\t.getsockopt\t= smc_getsockopt,\n 51:\t\t.sendmsg\t= smc_sendmsg,\n 52:\t\t.recvmsg\t= smc_recvmsg,\n 53:\t\t.mmap\t\t= sock_no_mmap,\n 54:\t\t.splice_read\t= smc_splice_read,\n 55:\t};\n 56:\t\n 57:\tstatic struct inet_protosw smc_inet_protosw = {\n 58:\t\t.type\t\t= SOCK_STREAM,\n 59:\t\t.protocol\t= IPPROTO_SMC,\n 60:\t\t.prot\t\t= \u0026smc_inet_prot,\n 61:\t\t.ops\t\t= \u0026smc_inet_stream_ops,\n 62:\t};\n 63:\t\n 64:\t#if IS_ENABLED(CONFIG_IPV6)\n 65:\tstruct smc6_sock {\n 66:\t\tstruct smc_sock\t\tsmc;\n 67:\t\tstruct ipv6_pinfo\tinet6;\n 68:\t};\n 69:\t\n 70:\tstatic struct proto smc_inet6_prot = {\n 71:\t\t.name\t\t= \"INET6_SMC\",\n 72:\t\t.owner\t\t= THIS_MODULE,\n"
} |
| 23/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14252 output: 32 thoughts: 166 Thoughts: **My Analysis of the SMC Socket Release Process** Okay, let me trace this `smc_inet_stream_ops.release` function. Ah, it's just a pointer to `smc_release`. That's good; keeps it clean. So, `smc_release` is the heart of the socket closure. It means this is what gets called when a connection is terminated. I need to understand what happens here. Right, `smc_release` calls `__smc_release`, which is where the real work begins. Within `__smc_release` I see `sk->sk_prot->unhash(sk)` – that's expected, unlinking the socket from the network hash table – and `smc_clcsock_release(smc)`, which I'll have to investigate more thoroughly. But hold on, `smc_release` *also* calls `sock_put(sk)`. That's where the reference counting comes in. When the reference count on the socket, `sk`, drops to zero, `sk_free` is triggered. I need to make sure I am on the right path. Now, I thought it was `sk_common_release` calling `sk_prot->destroy(sk)` but `sk_destruct` calls `sk_prot->destroy`. It's all connected. Let me just confirm exactly how `sk_common_release` functions to provide a firm understanding. I'll need to dig into that function now to be sure I am tracing this properly. |
| 24/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "sk_common_release",
"PathPrefix": "net/core/sock.c"
}Results: {
"Output": "net/core/sock.c=4035=EXPORT_SYMBOL(sock_common_setsockopt);\nnet/core/sock.c-4036-\nnet/core/sock.c:4037:void sk_common_release(struct sock *sk)\nnet/core/sock.c-4038-{\n--\nnet/core/sock.c-4042-\t/*\nnet/core/sock.c:4043:\t * Observation: when sk_common_release is called, processes have\nnet/core/sock.c-4044-\t * no access to socket. But net still has.\n--\nnet/core/sock.c-4069-}\nnet/core/sock.c:4070:EXPORT_SYMBOL(sk_common_release);\nnet/core/sock.c-4071-\n"
} |
| 25/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14999 output: 36 thoughts: 11 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm deep in my domain of expertise: **Diving into `sk_common_release`** Alright, time to dive into `sk_common_release`. I need to get a handle on what's changed and what's included here. Given its name, "common release," I'm expecting a collection of foundational or shared components. This could be anything from core libraries and utility functions to crucial configuration files or even some essential testing infrastructure. Knowing this release is "common" it is likely a source of dependency for multiple other projects, making understanding the scope and impact of changes critical. I need to figure out the target audience and what areas it is affecting so I am not missing any potential issues. Let's dig in and see exactly what's under the hood. |
| 26/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/core/sock.c",
"FirstLine": 4037,
"LineCount": 50
}Results: {
"Contents": "4037:\tvoid sk_common_release(struct sock *sk)\n4038:\t{\n4039:\t\tif (sk-\u003esk_prot-\u003edestroy)\n4040:\t\t\tsk-\u003esk_prot-\u003edestroy(sk);\n4041:\t\n4042:\t\t/*\n4043:\t\t * Observation: when sk_common_release is called, processes have\n4044:\t\t * no access to socket. But net still has.\n4045:\t\t * Step one, detach it from networking:\n4046:\t\t *\n4047:\t\t * A. Remove from hash tables.\n4048:\t\t */\n4049:\t\n4050:\t\tsk-\u003esk_prot-\u003eunhash(sk);\n4051:\t\n4052:\t\t/*\n4053:\t\t * In this point socket cannot receive new packets, but it is possible\n4054:\t\t * that some packets are in flight because some CPU runs receiver and\n4055:\t\t * did hash table lookup before we unhashed socket. They will achieve\n4056:\t\t * receive queue and will be purged by socket destructor.\n4057:\t\t *\n4058:\t\t * Also we still have packets pending on receive queue and probably,\n4059:\t\t * our own packets waiting in device queues. sock_destroy will drain\n4060:\t\t * receive queue, but transmitted packets will delay socket destruction\n4061:\t\t * until the last reference will be released.\n4062:\t\t */\n4063:\t\n4064:\t\tsock_orphan(sk);\n4065:\t\n4066:\t\txfrm_sk_free_policy(sk);\n4067:\t\n4068:\t\tsock_put(sk);\n4069:\t}\n4070:\tEXPORT_SYMBOL(sk_common_release);\n4071:\t\n4072:\tvoid sk_get_meminfo(const struct sock *sk, u32 *mem)\n4073:\t{\n4074:\t\tmemset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);\n4075:\t\n4076:\t\tmem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);\n4077:\t\tmem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk-\u003esk_rcvbuf);\n4078:\t\tmem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);\n4079:\t\tmem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk-\u003esk_sndbuf);\n4080:\t\tmem[SK_MEMINFO_FWD_ALLOC] = READ_ONCE(sk-\u003esk_forward_alloc);\n4081:\t\tmem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk-\u003esk_wmem_queued);\n4082:\t\tmem[SK_MEMINFO_OPTMEM] = atomic_read(\u0026sk-\u003esk_omem_alloc);\n4083:\t\tmem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk-\u003esk_backlog.len);\n4084:\t\tmem[SK_MEMINFO_DROPS] = sk_drops_read(sk);\n4085:\t}\n4086:\t\n"
} |
| 27/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16073 output: 37 thoughts: 312 Thoughts: **Analyzing a Race Condition Fix in SMC Socket Handling** Okay, so I'm looking at this patch and immediately, my brain goes to the sequence of events. `sk_common_release` calls `sk->sk_prot->destroy(sk)` then `sk->sk_prot->unhash(sk)`. This patch adds `smc_inet_destroy_sock`, which, crucially, calls `sk->sk_prot->unhash(sk)` *before* `smc_clcsock_release(smc_sk(sk))`. The comment is key here. It's highlighting a potential race. `smc_diag` can dump data that dereferences `smc->clcsock` without the `clcsock_release_lock`, while the standard `sk_common_release()` destroys things in the wrong order (.destroy before .unhash). This new ordering, unhashing *before* any teardown, is designed to prevent a dump from observing the socket being freed. The second unhash is, of course, a no-op, but it's the first one that matters. So, it's a race condition fix. I see it now. Because `smc_inet_destroy_sock` is static, I can't really dig into that directly, but it makes me consider the related functions: `smc_release`, `smc_clcsock_release`, `smc_inet_init_sock`, and, especially, `smc_diag_dump`. Where is that? Ah, yes, `net/smc/smc_diag.c`. I'm going to take a closer look at `smc_diag_dump` now to fully understand the vulnerability this patch is addressing. |
| 28/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "smc_diag_dump",
"PathPrefix": "net/smc/smc_diag.c"
}Results: {
"Output": "net/smc/smc_diag.c-25-\nnet/smc/smc_diag.c:26:struct smc_diag_dump_ctx {\nnet/smc/smc_diag.c-27-\tint pos[2];\n--\nnet/smc/smc_diag.c-29-\nnet/smc/smc_diag.c:30:static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)\nnet/smc/smc_diag.c-31-{\nnet/smc/smc_diag.c:32:\treturn (struct smc_diag_dump_ctx *)cb-\u003ectx;\nnet/smc/smc_diag.c-33-}\n--\nnet/smc/smc_diag.c=60=static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,\n--\nnet/smc/smc_diag.c-71-\nnet/smc/smc_diag.c:72:static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,\nnet/smc/smc_diag.c-73-\t\t\t struct netlink_callback *cb,\n--\nnet/smc/smc_diag.c-195-\nnet/smc/smc_diag.c:196:static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,\nnet/smc/smc_diag.c-197-\t\t\t struct netlink_callback *cb, int p_type)\nnet/smc/smc_diag.c-198-{\nnet/smc/smc_diag.c:199:\tstruct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);\nnet/smc/smc_diag.c-200-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/smc/smc_diag.c-216-\t\t\tgoto next;\nnet/smc/smc_diag.c:217:\t\trc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb-\u003enlh), bc);\nnet/smc/smc_diag.c-218-\t\tif (rc \u003c 0)\n--\nnet/smc/smc_diag.c-229-\nnet/smc/smc_diag.c:230:static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)\nnet/smc/smc_diag.c-231-{\n--\nnet/smc/smc_diag.c-233-\nnet/smc/smc_diag.c:234:\trc = smc_diag_dump_proto(\u0026smc_proto, skb, cb, SMCPROTO_SMC);\nnet/smc/smc_diag.c-235-\tif (!rc)\nnet/smc/smc_diag.c:236:\t\tsmc_diag_dump_proto(\u0026smc_proto6, skb, cb, SMCPROTO_SMC6);\nnet/smc/smc_diag.c-237-\treturn skb-\u003elen;\n--\nnet/smc/smc_diag.c=240=static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)\n--\nnet/smc/smc_diag.c-247-\t\t\tstruct netlink_dump_control c = {\nnet/smc/smc_diag.c:248:\t\t\t\t.dump = smc_diag_dump,\nnet/smc/smc_diag.c-249-\t\t\t\t.min_dump_alloc = SKB_WITH_OVERHEAD(32768),\n"
} |
| 29/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17779 output: 39 thoughts: 68 Thoughts: **My Configuration Checklist** Okay, so I need to make sure I have the right configs enabled. It looks like I'm definitely going to need both `SMC` and `SMC_DIAG`. But hang on a second... when I look at what `smc_diag_dump` actually *dumps*, it's listing `smc_proto` and `smc_proto6`. Where's `smc_inet_prot` in that mix? I need to double-check that `smc_diag_dump` process again to ensure I'm capturing everything relevant. Something feels off, so better to be thorough. |
| 30/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/smc/smc_diag.c",
"FirstLine": 230,
"LineCount": 50
}Results: {
"Contents": " 230:\tstatic int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)\n 231:\t{\n 232:\t\tint rc = 0;\n 233:\t\n 234:\t\trc = smc_diag_dump_proto(\u0026smc_proto, skb, cb, SMCPROTO_SMC);\n 235:\t\tif (!rc)\n 236:\t\t\tsmc_diag_dump_proto(\u0026smc_proto6, skb, cb, SMCPROTO_SMC6);\n 237:\t\treturn skb-\u003elen;\n 238:\t}\n 239:\t\n 240:\tstatic int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)\n 241:\t{\n 242:\t\tstruct net *net = sock_net(skb-\u003esk);\n 243:\t\n 244:\t\tif (h-\u003enlmsg_type == SOCK_DIAG_BY_FAMILY \u0026\u0026\n 245:\t\t h-\u003enlmsg_flags \u0026 NLM_F_DUMP) {\n 246:\t\t\t{\n 247:\t\t\t\tstruct netlink_dump_control c = {\n 248:\t\t\t\t\t.dump = smc_diag_dump,\n 249:\t\t\t\t\t.min_dump_alloc = SKB_WITH_OVERHEAD(32768),\n 250:\t\t\t\t};\n 251:\t\t\t\treturn netlink_dump_start(net-\u003ediag_nlsk, skb, h, \u0026c);\n 252:\t\t\t}\n 253:\t\t}\n 254:\t\treturn 0;\n 255:\t}\n 256:\t\n 257:\tstatic const struct sock_diag_handler smc_diag_handler = {\n 258:\t\t.owner = THIS_MODULE,\n 259:\t\t.family = AF_SMC,\n 260:\t\t.dump = smc_diag_handler_dump,\n 261:\t};\n 262:\t\n 263:\tstatic int __init smc_diag_init(void)\n 264:\t{\n 265:\t\treturn sock_diag_register(\u0026smc_diag_handler);\n 266:\t}\n 267:\t\n 268:\tstatic void __exit smc_diag_exit(void)\n 269:\t{\n 270:\t\tsock_diag_unregister(\u0026smc_diag_handler);\n 271:\t}\n 272:\t\n 273:\tmodule_init(smc_diag_init);\n 274:\tmodule_exit(smc_diag_exit);\n 275:\tMODULE_LICENSE(\"GPL\");\n 276:\tMODULE_DESCRIPTION(\"SMC socket monitoring via SOCK_DIAG\");\n 277:\tMODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);\n 278:\tMODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);\n"
} |
| 31/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 18824 output: 39 thoughts: 109 Thoughts: **My Line of Inquiry Regarding SMC Diagnostics** Okay, so I'm digging into how we're diagnosing SMC connections and I need to make sure I understand the scope of what we're dumping. The `smc_diag_dump` tool… right, it clearly captures data from `smc_proto` and `smc_proto6`. Good. But wait… what about `smc_inet_prot`? Does `smc_diag_dump` actually include that information? No, it doesn't seem to, which is a key point of clarification. Thinking it through, `smc_inet_prot` is specific to `IPPROTO_SMC` sockets, and I need to know if we are getting a complete picture with `smc_diag_dump`. So, to be thorough and correct, I should check the implementation details, specifically `smc_diag_dump_proto`. That seems like the logical next step to confirm my initial thoughts about the function. |
| 32/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/smc/smc_diag.c",
"FirstLine": 196,
"LineCount": 30
}Results: {
"Contents": " 196:\tstatic int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,\n 197:\t\t\t\t struct netlink_callback *cb, int p_type)\n 198:\t{\n 199:\t\tstruct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);\n 200:\t\tstruct net *net = sock_net(skb-\u003esk);\n 201:\t\tint snum = cb_ctx-\u003epos[p_type];\n 202:\t\tstruct nlattr *bc = NULL;\n 203:\t\tstruct hlist_head *head;\n 204:\t\tint rc = 0, num = 0;\n 205:\t\tstruct sock *sk;\n 206:\t\n 207:\t\tread_lock(\u0026prot-\u003eh.smc_hash-\u003elock);\n 208:\t\thead = \u0026prot-\u003eh.smc_hash-\u003eht;\n 209:\t\tif (hlist_empty(head))\n 210:\t\t\tgoto out;\n 211:\t\n 212:\t\tsk_for_each(sk, head) {\n 213:\t\t\tif (!net_eq(sock_net(sk), net))\n 214:\t\t\t\tcontinue;\n 215:\t\t\tif (num \u003c snum)\n 216:\t\t\t\tgoto next;\n 217:\t\t\trc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb-\u003enlh), bc);\n 218:\t\t\tif (rc \u003c 0)\n 219:\t\t\t\tgoto out;\n 220:\tnext:\n 221:\t\t\tnum++;\n 222:\t\t}\n 223:\t\n 224:\tout:\n 225:\t\tread_unlock(\u0026prot-\u003eh.smc_hash-\u003elock);\n"
} |
| 33/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 19666 output: 39 thoughts: 56 Thoughts: Okay, here's my interpretation of those thoughts, presented as my own mental process, given my expertise: **Checking SMC Protocol Hash Table Usage** Right, so I'm seeing that `smc_proto` and `smc_proto6` are likely sharing a hash table with `smc_inet_prot`. That's an interesting architectural choice. I need to confirm that relationship, especially given the potential performance implications and contention issues that might arise. My gut feeling is it's probably best to verify the code directly. Time to dive into the kernel, specifically `net/smc/af_smc.c`. I need to understand how the connection and socket management for SMC, and SMCv6 are structured and verify if my intuition is right. This will give me the best view on if the implementation makes logical sense. |
| 34/2 | 2026/08/21 08:43 | tool | read-file |
0mArgs:{
"File": "net/smc/af_smc.c",
"FirstLine": 238,
"LineCount": 30
}Results: {
"Contents": " 238:\tstruct proto smc_proto = {\n 239:\t\t.name\t\t= \"SMC\",\n 240:\t\t.owner\t\t= THIS_MODULE,\n 241:\t\t.keepalive\t= smc_set_keepalive,\n 242:\t\t.hash\t\t= smc_hash_sk,\n 243:\t\t.unhash\t\t= smc_unhash_sk,\n 244:\t\t.release_cb\t= smc_release_cb,\n 245:\t\t.obj_size\t= sizeof(struct smc_sock),\n 246:\t\t.h.smc_hash\t= \u0026smc_v4_hashinfo,\n 247:\t\t.slab_flags\t= SLAB_TYPESAFE_BY_RCU,\n 248:\t};\n 249:\tEXPORT_SYMBOL_GPL(smc_proto);\n 250:\t\n 251:\tstruct proto smc_proto6 = {\n 252:\t\t.name\t\t= \"SMC6\",\n 253:\t\t.owner\t\t= THIS_MODULE,\n 254:\t\t.keepalive\t= smc_set_keepalive,\n 255:\t\t.hash\t\t= smc_hash_sk,\n 256:\t\t.unhash\t\t= smc_unhash_sk,\n 257:\t\t.release_cb\t= smc_release_cb,\n 258:\t\t.obj_size\t= sizeof(struct smc_sock),\n 259:\t\t.h.smc_hash\t= \u0026smc_v6_hashinfo,\n 260:\t\t.slab_flags\t= SLAB_TYPESAFE_BY_RCU,\n 261:\t};\n 262:\tEXPORT_SYMBOL_GPL(smc_proto6);\n 263:\t\n 264:\tstatic void smc_fback_restore_callbacks(struct smc_sock *smc)\n 265:\t{\n 266:\t\tstruct sock *clcsk = smc-\u003eclcsock-\u003esk;\n 267:\t\n"
} |
| 35/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 20477 output: 40 thoughts: 458 Thoughts: **Analyzing a Concurrency Bug in SMC Diagnostic Dumps** Okay, let's break this down. It looks like the `smc_proto` code utilizes `smc_v4_hashinfo`, while `smc_proto6` uses `smc_v6_hashinfo`. Similarly, `smc_inet_prot` uses `smc_v4_hashinfo` and `smc_inet6_prot` uses `smc_v6_hashinfo`. And, `smc_diag_dump_proto` covers all of these. The critical issue is a race condition within the diagnostic dump process. Specifically, `smc_diag_dump` is dereferencing `smc->clcsock` without the necessary `clcsock_release_lock`, right? This is happening while `sk_common_release` is going through its steps, calling the `.destroy` method *before* `.unhash`. So, we've got a situation where the socket is still in the hash table when `.destroy` gets called. The `.destroy` function in this context is `smc_inet_destroy_sock`, which itself calls `smc_clcsock_release(smc_sk(sk))`. This `smc_clcsock_release` function is where the problem is most likely coming from, as it either sets `smc->clcsock` to NULL or frees it completely. The race is that if `smc_diag_dump` runs concurrently, it could potentially see `smc->clcsock` being released right out from under it. The immediate fix is clear: unhash the socket *before* destroying it in `smc_inet_destroy_sock`. This is a pretty significant functional change related to socket teardown, so it's a prime target for fuzzing. The necessary configurations are `SMC` and `SMC_DIAG`. My focus now will be on the relevant functions, namely `smc_release`, `smc_clcsock_release`, `smc_diag_dump`, and `smc_diag_dump_proto`. Wait... I need to double-check something. Hang on, `smc_diag_dump` and `smc_diag_handler_dump` are both static, right? If that's the case, should I still focus on them? The more likely candidate seems to be `smc_release` and `smc_clcsock_release`. Yep, `smc_release` and `smc_clcsock_release` are the key functions to watch. Hang on, wait a second. `smc_clcsock_release` is not static! Perfect! Now, time to just check if `smc_clcsock_release` is exported or just global. |
| 36/2 | 2026/08/21 08:43 | tool | grepper |
0mArgs:{
"Expression": "void smc_clcsock_release",
"PathPrefix": "net/smc/smc_close.c"
}Results: {
"Output": "net/smc/smc_close.c-23-/* release the clcsock that is assigned to the smc_sock */\nnet/smc/smc_close.c:24:void smc_clcsock_release(struct smc_sock *smc)\nnet/smc/smc_close.c-25-{\n"
} |
| 37/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21676 output: 34 thoughts: 37 Thoughts: **Analyzing the SMC Diagnostic Context** Okay, so this is a global issue, got it. My immediate thought is to start digging into the `smc_diag_dump` function. It seems to be static, which is a good starting point for narrowing down the scope, but I need to understand its relationship to the rest of the system. I need to know the origin and use. Next step: I need to quickly identify if there are any exported functions within `smc_diag.c`. I need to figure out what functionality this file offers to the system as a whole. Knowing what's available for other components to call into here will be key to understanding the control flow and impact of `smc_diag_dump`. I need to see if there's an interface I can leverage. |
| 38/2 | 2026/08/21 08:43 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL",
"PathPrefix": "net/smc/smc_diag.c"
}Results: {
"error": "no matches"
} |
| 39/2 | 2026/08/21 08:43 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21928 output: 39 thoughts: 67 Thoughts: Okay, let's see... **Analyzing SMC Socket Initialization and Release Functions** Hmm, no, that's not quite right. My mind immediately jumps to `smc_inet_init_sock`. Now, *that* one is static, isn't it? Let's keep that in mind. Okay, what about `smc_inet_init`? Ah, yes, `__init`. That's a different beast entirely. We'll need to remember how that impacts lifecycle. Now the big picture... `smc_release`. That's a global function. Now, a lightbulb...is `smc_release` exported, or is it hidden? That's what I need to dig into. We need to be able to use it, to work with it. Let's see if that's the key. |
| 40/2 | 2026/08/21 08:44 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL.*smc_release",
"PathPrefix": "net/smc/af_smc.c"
}Results: {
"error": "no matches"
} |
| 41/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22228 output: 37 thoughts: 23 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: **Navigating Scope and Functionality** Alright, so the variable in question, whatever it is, isn't *explicitly* exported, meaning it likely isn't part of a direct API exposed to other modules or components in the traditional sense. However, the use of the term "global" suggests it's accessible and potentially modifiable from different parts of the system. This implies a scope concern, likely needing special consideration to protect against unintended side effects or conflicts. My next immediate thought is to examine `smc_close_active`. It's a key piece of contextual information. This likely a function or a macro which could be used to discover how to manage this specific component. I need to understand its relationship to the "global" variable. Is it used to *set*, *read*, or *manage* this "global" value? Knowing the interaction will be the key to understanding how it is set and cleared, as well as if there are any race conditions on its use, that may cause a malfunction. That will shed light on how the variable's scope and access are *intended* to work, and if it's playing nicely with the rest of the application. |
| 42/2 | 2026/08/21 08:44 | tool | grepper |
0mArgs:{
"Expression": "smc_close_active",
"PathPrefix": "net/smc/smc_close.c"
}Results: {
"Output": "net/smc/smc_close.c=114=static void smc_close_cancel_work(struct smc_sock *smc)\n--\nnet/smc/smc_close.c-127- */\nnet/smc/smc_close.c:128:void smc_close_active_abort(struct smc_sock *smc)\nnet/smc/smc_close.c-129-{\n--\nnet/smc/smc_close.c=187=static inline bool smc_close_sent_any_close(struct smc_connection *conn)\n--\nnet/smc/smc_close.c-192-\nnet/smc/smc_close.c:193:int smc_close_active(struct smc_sock *smc)\nnet/smc/smc_close.c-194-{\n"
} |
| 43/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22791 output: 68 thoughts: 56 Thoughts: **My Initial Assessment of the SMC Diagnostic Code** Okay, so I'm looking at this `smc_diag` code and the first thing that jumps out is that `smc_close_active` is a global variable. That's a potential area for contention and needs careful consideration. I need to understand its scope and how it's used across the system. My next step is to see what the diagnostic handlers actually *do*. I'll check `smc_diag_handler_dump` and `smc_diag_dump`. I believe they're static functions, which should limit their visibility and potential for conflicts, but I need to confirm that. I need to understand the relationship between these handler functions. Finally, just to be thorough and to build a good mental model of the module, I'll scan through `smc_diag.c` for any *other* global functions. It's good practice to identify all entry points and potential side effects in a code block early on to avoid unpleasant surprises down the line. We need to be able to reason about this code effectively. |
| 44/2 | 2026/08/21 08:44 | tool | grepper |
0mError:no matches Args: {
"Expression": "^[a-zA-Z_][a-zA-Z0-9_]* [a-zA-Z_][a-zA-Z0-9_]*\\(",
"PathPrefix": "net/smc/smc_diag.c"
}Results: {
"error": "no matches"
} |
| 45/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23161 output: 33 thoughts: 377 Thoughts: **My Analysis of SMC Socket Release and Diagnostic Functions** Okay, so I'm trying to figure out the key functions related to releasing and managing SMC sockets and associated diagnostics. Initially, I thought focusing on `smc_release` and `smc_clcsock_release` would be a good starting point, and that seems correct, given the context of the patch. The patch is about `smc_inet_destroy_sock`, but how do we trigger that? Ah, right, create an `AF_INET` socket using `IPPROTO_SMC` and then simply close it. That should trigger it. The socket creation itself uses `smc_inet_init_sock`, which is static, so not an interesting entry point. But looking further, `smc_inet_stream_ops` has `.release = smc_release`, which means when the socket is closed, `smc_release` gets called, and then `sk_common_release` when the socket itself is freed. `smc_release` definitely looks like a solid focus symbol. Also, `smc_clcsock_release` is called from `smc_inet_destroy_sock`, which is also important. So `smc_clcsock_release` is a key function to examine as well. I looked at other functions involved with SMC. `smc_diag_dump` is invoked by netlink `SOCK_DIAG_BY_FAMILY` for `AF_SMC`. Ah, but `smc_diag_handler_dump` is registered for `AF_SMC`, so `sock_diag_rcv_msg` calls `smc_diag_handler_dump`. However, that one is static, so it's not useful as a focus symbol. My main focus will be on the `smc_release` and `smc_clcsock_release` functions. Now I need to check the `net/smc/Kconfig` file to see how `SMC` and `SMC_DIAG` depend on each other. |
| 46/2 | 2026/08/21 08:44 | tool | read-file |
0mArgs:{
"File": "net/smc/Kconfig",
"FirstLine": 1,
"LineCount": 30
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tconfig SMC\n 3:\t\ttristate \"SMC socket protocol family\"\n 4:\t\tdepends on INET \u0026\u0026 INFINIBAND \u0026\u0026 DIBS\n 5:\t\thelp\n 6:\t\t SMC-R provides a \"sockets over RDMA\" solution making use of\n 7:\t\t RDMA over Converged Ethernet (RoCE) technology to upgrade\n 8:\t\t AF_INET TCP connections transparently.\n 9:\t\t The Linux implementation of the SMC-R solution is designed as\n 10:\t\t a separate socket family SMC.\n 11:\t\n 12:\t\t Select this option if you want to run SMC socket applications\n 13:\t\n 14:\tconfig SMC_DIAG\n 15:\t\ttristate \"SMC: socket monitoring interface\"\n 16:\t\tdepends on SMC\n 17:\t\thelp\n 18:\t\t Support for SMC socket monitoring interface used by tools such as\n 19:\t\t smcss.\n 20:\t\n 21:\t\t if unsure, say Y.\n 22:\t\n 23:\tconfig SMC_HS_CTRL_BPF\n 24:\t\tbool \"Generic eBPF hook for SMC handshake flow\"\n 25:\t\tdepends on SMC \u0026\u0026 BPF_JIT \u0026\u0026 BPF_SYSCALL\n 26:\t\tdefault y\n 27:\t\thelp\n 28:\t\t SMC_HS_CTRL_BPF enables support to register generic eBPF hook for SMC\n 29:\t\t handshake flow, which offer much greater flexibility in modifying the behavior\n 30:\t\t of the SMC protocol stack compared to a complete kernel-based approach. Select\n"
} |
| 47/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24443 output: 29 thoughts: 112 Thoughts: **My SMC Dependency Confusion** Okay, so I was looking at the dependency tree for `SMC`. Initially, I thought it was reliant on `INET`, `INFINIBAND`, *and* `DIBS`. But, wait, `DIBS`? That doesn't sound right at all. It's not a standard requirement. Let me double-check the output. Nope, it says `INET`, `INFINIBAND`, and… `DIBS`? This is throwing me off! Okay, I must have misread something. Let me go back and re-read the relevant documentation again. Ah, finally! It's `INET` and `INFINIBAND`. Wait… Why am I seeing `DIBS`? Time to go back and check the `net/smc/Kconfig` file again to see if I am missing something. |
| 48/2 | 2026/08/21 08:44 | tool | grepper |
0mArgs:{
"Expression": "depends on",
"PathPrefix": "net/smc/Kconfig"
}Results: {
"Output": "net/smc/Kconfig=2=config SMC\nnet/smc/Kconfig-3-\ttristate \"SMC socket protocol family\"\nnet/smc/Kconfig:4:\tdepends on INET \u0026\u0026 INFINIBAND \u0026\u0026 DIBS\nnet/smc/Kconfig-5-\thelp\n--\nnet/smc/Kconfig=14=config SMC_DIAG\nnet/smc/Kconfig-15-\ttristate \"SMC: socket monitoring interface\"\nnet/smc/Kconfig:16:\tdepends on SMC\nnet/smc/Kconfig-17-\thelp\n--\nnet/smc/Kconfig=23=config SMC_HS_CTRL_BPF\nnet/smc/Kconfig-24-\tbool \"Generic eBPF hook for SMC handshake flow\"\nnet/smc/Kconfig:25:\tdepends on SMC \u0026\u0026 BPF_JIT \u0026\u0026 BPF_SYSCALL\nnet/smc/Kconfig-26-\tdefault y\n"
} |
| 49/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25013 output: 17 thoughts: 26 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Investigating a Mysterious DIBS** Okay, hold on a second... "DIBS"? I haven't seen that term thrown around in a while. What exactly are we talking about here? I have to understand the context. It's time to fire up the mental machinery. My first instinct is to dig directly into the Kconfig files. This sounds like it could be a configuration option, a macro, or potentially something else entirely defined within the kernel's configuration system. Let's see what Kconfig has to say about `DIBS`. Time to go hunting. |
| 50/2 | 2026/08/21 08:44 | tool | grepper |
0mArgs:{
"Expression": "config DIBS"
}Results: {
"Output": "drivers/dibs/Kconfig-1-# SPDX-License-Identifier: GPL-2.0\ndrivers/dibs/Kconfig:2:config DIBS\ndrivers/dibs/Kconfig-3-\ttristate \"Direct Internal Buffer Sharing support\"\n--\ndrivers/dibs/Kconfig-13-\ndrivers/dibs/Kconfig:14:config DIBS_LO\ndrivers/dibs/Kconfig-15-\tbool \"Intra-OS shortcut with dibs loopback\"\n"
} |
| 51/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25321 output: 38 thoughts: 255 Thoughts: **Kernel Configuration and Fuzzing Strategy for SMC** Okay, so I'm looking at this patch and it seems like `DIBS` is a custom configuration specific to this kernel tree. That's good to know. Now, `SMC` appears to be dependent on `INET`, `INFINIBAND`, and `DIBS`. Alright, I need to make sure those are all enabled for fuzzing this. Therefore, I'll add `SMC`, `SMC_DIAG`, `INET`, `INFINIBAND`, and `DIBS` to the `EnableConfigs` list. Hold on, though. `INET` is generally a given, and `INFINIBAND` is pretty standard. No need to explicitly specify those. Let's make sure `SMC` and `SMC_DIAG` are enabled, though. Right, the patch itself targets a race condition in `smc_inet_destroy_sock`, and that happens during socket destruction. Sounds like a textbook race condition, so this definitely warrants fuzzing attention. Okay, let's consolidate this: `WorthFuzzing: true`. Absolutely. `FocusSymbols: smc_release, smc_clcsock_release`. Those two functions sound like prime targets, considering the race condition. `EnableConfigs: SMC, SMC_DIAG, INFINIBAND, DIBS`. Making sure those dependencies are met. Now, let me just quickly run through the other related functions. `smc_inet_init` is marked as `__init`, so probably not as interesting for this. And `smc_inet_exit` is similar. How about `smc_hash_sk` and `smc_unhash_sk`? I'll keep those in mind, but they're not the *primary* focus right now. Good enough for now. |
| 52/2 | 2026/08/21 08:44 | tool | grepper |
0mArgs:{
"Expression": "smc_unhash_sk",
"PathPrefix": "net/smc/af_smc.c"
}Results: {
"Output": "net/smc/af_smc.c=199=int smc_hash_sk(struct sock *sk)\n--\nnet/smc/af_smc.c-213-\nnet/smc/af_smc.c:214:void smc_unhash_sk(struct sock *sk)\nnet/smc/af_smc.c-215-{\n--\nnet/smc/af_smc.c=238=struct proto smc_proto = {\n--\nnet/smc/af_smc.c-242-\t.hash\t\t= smc_hash_sk,\nnet/smc/af_smc.c:243:\t.unhash\t\t= smc_unhash_sk,\nnet/smc/af_smc.c-244-\t.release_cb\t= smc_release_cb,\n--\nnet/smc/af_smc.c=251=struct proto smc_proto6 = {\n--\nnet/smc/af_smc.c-255-\t.hash\t\t= smc_hash_sk,\nnet/smc/af_smc.c:256:\t.unhash\t\t= smc_unhash_sk,\nnet/smc/af_smc.c-257-\t.release_cb\t= smc_release_cb,\n"
} |
| 53/2 | 2026/08/21 08:44 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26360 output: 166 thoughts: 251 Thoughts: **My Analysis of the SMC Module's Symbol and Configuration Dependencies** Okay, here's what I've got so far. I'm focusing on cleaning up and understanding the dependencies within the SMC module. It looks like `smc_unhash_sk` is a global variable and I see that it's called within `smc_inet_destroy_sock`, specifically through `sk->sk_prot->unhash(sk)`. This makes it a prime candidate for inclusion in my `FocusSymbols` list, that's definitely a point of interaction. I quickly confirmed that `smc_inet_destroy_sock` is indeed a static function; this confirms my understanding of its scope. Then, I checked that both `smc_clcsock_release` and `smc_release` are globally accessible. So my final `FocusSymbols` list is looking like: - `smc_release` - `smc_clcsock_release` - `smc_unhash_sk` Next, I've got to ensure the configuration options are correct. My `EnableConfigs` list is currently: - `SMC` - `SMC_DIAG` - `INFINIBAND` - `DIBS` I need to confirm the need for `DIBS`. The dependency is shown as: `depends on INET && INFINIBAND && DIBS`. Yes, given the context, `DIBS` is absolutely required. Alright, I'm satisfied with this. Time to execute `set-results`. |
| 54/2 | 2026/08/21 08:44 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"SMC",
"SMC_DIAG",
"INFINIBAND",
"DIBS"
],
"FocusSymbols": [
"smc_release",
"smc_clcsock_release",
"smc_unhash_sk"
],
"Reasoning": "The patch fixes a race condition during SMC socket destruction where smc_diag dumps could dereference a released clcsock. It modifies the socket teardown flow by adding a .destroy callback to smc_inet_prot and smc_inet6_prot, which unhashes the socket before releasing the clcsock. This is a functional change in core networking code that is reachable and should be fuzzed.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"SMC",
"SMC_DIAG",
"INFINIBAND",
"DIBS"
],
"FocusSymbols": [
"smc_release",
"smc_clcsock_release",
"smc_unhash_sk"
],
"Reasoning": "The patch fixes a race condition during SMC socket destruction where smc_diag dumps could dereference a released clcsock. It modifies the socket teardown flow by adding a .destroy callback to smc_inet_prot and smc_inet6_prot, which unhashes the socket before releasing the clcsock. This is a functional change in core networking code that is reachable and should be fuzzed.",
"WorthFuzzing": true
} |
| 55/1 | 2026/08/21 08:44 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 56/2 | 2026/08/21 08:44 | agent | kmsan-evaluator |
0mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch fixes a race condition during socket destruction where `smc_diag` dumps could dereference `smc-\u003eclcsock` while it is being released. This is a use-after-free or NULL pointer dereference bug, which is effectively caught by KASAN. The patch does not introduce any new allocations, does not copy data to user space, and does not alter bounds checking or data length calculations. There is no risk of uninitialized memory usage or info-leaks introduced by these changes.",
"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: For your convenience, here is the diff of the changes:
commit 262a5dd0f8b41a88f92671fd5525ce7faa38a11e
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Aug 21 08:42:28 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
index a94084b4a498e..520b666fdd8fa 100644
--- a/net/smc/smc_inet.c
+++ b/net/smc/smc_inet.c
@@ -15,13 +15,16 @@
#include "smc_inet.h"
#include "smc.h"
+#include "smc_close.h"
static int smc_inet_init_sock(struct sock *sk);
+static void smc_inet_destroy_sock(struct sock *sk);
static struct proto smc_inet_prot = {
.name = "INET_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
+ .destroy = smc_inet_destroy_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
@@ -68,6 +71,7 @@ static struct proto smc_inet6_prot = {
.name = "INET6_SMC",
.owner = THIS_MODULE,
.init = smc_inet_init_sock,
+ .destroy = smc_inet_destroy_sock,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.release_cb = smc_release_cb,
@@ -116,6 +120,18 @@ static int smc_inet_init_sock(struct sock *sk)
return smc_create_clcsk(net, sk, sk->sk_family);
}
+static void smc_inet_destroy_sock(struct sock *sk)
+{
+ /* The sock is hashed and smc_diag dumps dereference smc->clcsock
+ * without clcsock_release_lock, while sk_common_release() calls
+ * .destroy before .unhash. Unhash first, as __smc_release() does,
+ * so no dump can observe the clcsock being released; the second
+ * unhash is a no-op.
+ */
+ sk->sk_prot->unhash(sk);
+ smc_clcsock_release(smc_sk(sk));
+}
+
int __init smc_inet_init(void)
{
int rc;
|
| 57/3 | 2026/08/21 08:44 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2437 output: 131 thoughts: 308 Thoughts: **My Assessment of the SMC Socket Destruction Patch** Okay, so this patch is addressing a pretty classic concurrency issue in the SMC networking code. It's adding a `destroy` callback to `smc_inet_prot` and `smc_inet6_prot`, which is going to call `smc_inet_destroy_sock`. That function then does the crucial step of unhashing the socket before calling `smc_clcsock_release`. The comments explicitly point out that this order change is to prevent a use-after-free or, even worse, a null-pointer dereference. Essentially, `smc_diag` was trying to access `smc->clcsock` during a debug dump *while* `clcsock` was in the process of being released. The KASAN has already caught this, which is great. The core of the fix is to make sure the socket is unhashed *before* `smc_clcsock_release` is called, ensuring that debug dumps can't observe the `clcsock` being released. It's a race condition fix – exactly the kind of thing you'd expect to see. The patch is simply re-ordering existing operations, no new allocations, bounds checks, or data copies to user space. It is a straightforward fix for a concurrency issue. I will double-check, but I don't see any risk of introducing uninitialized memory exposure here. This is purely about protecting against a race during socket teardown. Given the straightforward nature of the fix and the fact that it resolves a detected concurrency bug, I'll set NeedsKMSAN to false. |
| 58/3 | 2026/08/21 08:44 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch fixes a race condition during socket destruction where `smc_diag` dumps could dereference `smc-\u003eclcsock` while it is being released. This is a use-after-free or NULL pointer dereference bug, which is effectively caught by KASAN. The patch does not introduce any new allocations, does not copy data to user space, and does not alter bounds checking or data length calculations. There is no risk of uninitialized memory usage or info-leaks introduced by these changes.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch fixes a race condition during socket destruction where `smc_diag` dumps could dereference `smc-\u003eclcsock` while it is being released. This is a use-after-free or NULL pointer dereference bug, which is effectively caught by KASAN. The patch does not introduce any new allocations, does not copy data to user space, and does not alter bounds checking or data length calculations. There is no risk of uninitialized memory usage or info-leaks introduced by these changes.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|