AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/02 22:46 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the initialization of `rhashtable` and `rhltable` to accept an additional `bucket_key` parameter for lockdep tracking. It updates the BPF hash table implementation to use `__lockdep_no_track__` to avoid lockdep warnings. These changes are purely related to lockdep debugging metadata and do not functionally alter the execution flow of the kernel. Therefore, it does not require fuzzing.",
  "WorthFuzzing": false
}
1/1 2026/08/02 22:46 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit e6f4c87cc71f0b6333706307efca3ffb40114576\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sun Aug 2 22:46:41 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/linux/rhashtable-types.h b/include/linux/rhashtable-types.h\nindex 57c11ec9dc645..059f21e37f777 100644\n--- a/include/linux/rhashtable-types.h\n+++ b/include/linux/rhashtable-types.h\n@@ -94,6 +94,9 @@ struct rhashtable {\n \tstruct mutex                    mutex;\n \tspinlock_t\t\t\tlock;\n \tatomic_t\t\t\tnelems;\n+#ifdef CONFIG_LOCKDEP\n+\tstruct lock_class_key\t*dep_key;\n+#endif\n #ifdef CONFIG_MEM_ALLOC_PROFILING\n \tstruct alloc_tag\t\t*alloc_tag;\n #endif\n@@ -138,23 +141,27 @@ struct rhashtable_iter {\n \n int __rhashtable_init_noprof(struct rhashtable *ht,\n \t\t    const struct rhashtable_params *params,\n-\t\t    struct lock_class_key *key);\n+\t\t    struct lock_class_key *key,\n+\t\t    struct lock_class_key *bucket_key);\n #define rhashtable_init_noprof(ht, params)\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \tstatic struct lock_class_key __key;\t\t\t\t\\\n+\tstatic struct lock_class_key __bucket_key;\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n-\t__rhashtable_init_noprof(ht, params, \u0026__key);\t\t\t\\\n+\t__rhashtable_init_noprof(ht, params, \u0026__key, \u0026__bucket_key);\t\\\n })\n #define rhashtable_init(...)\talloc_hooks(rhashtable_init_noprof(__VA_ARGS__))\n \n int __rhltable_init_noprof(struct rhltable *hlt,\n \t\t  const struct rhashtable_params *params,\n-\t\t  struct lock_class_key *key);\n+\t\t  struct lock_class_key *key,\n+\t\t  struct lock_class_key *bucket_key);\n #define rhltable_init_noprof(hlt, params)\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \tstatic struct lock_class_key __key;\t\t\t\t\\\n+\tstatic struct lock_class_key __bucket_key;\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n-\t__rhltable_init_noprof(hlt, params, \u0026__key);\t\t\t\\\n+\t__rhltable_init_noprof(hlt, params, \u0026__key, \u0026__bucket_key);\t\\\n })\n #define rhltable_init(...)\talloc_hooks(rhltable_init_noprof(__VA_ARGS__))\n \ndiff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c\nindex 9f394e1aa2e85..d7e2a601c5c06 100644\n--- a/kernel/bpf/hashtab.c\n+++ b/kernel/bpf/hashtab.c\n@@ -2822,7 +2822,19 @@ static struct bpf_map *rhtab_map_alloc(union bpf_attr *attr)\n \t\tparams.obj_cmpfn = rhtab_key_cmp_long;\n \t}\n \n-\terr = rhashtable_init(\u0026rhtab-\u003eht, \u0026params);\n+#ifdef CONFIG_LOCKDEP\n+#define bpf_rhashtable_init(ht, params)\t\t\t\t\t\\\n+\t({\t\t\t\t\t\t\t\t\\\n+\t\tstatic struct lock_class_key __key;\t\t\t\\\n+\t\t\t\t\t\t\t\t\t\\\n+\t\t__rhashtable_init_noprof(ht, params, \u0026__key,\t\t\\\n+\t\t\t\t\t \u0026__lockdep_no_track__);\t\\\n+\t})\n+#else\n+#define bpf_rhashtable_init(ht, params) rhashtable_init_noprof(ht, params)\n+#endif\n+\terr = alloc_hooks(bpf_rhashtable_init(\u0026rhtab-\u003eht, \u0026params));\n+#undef bpf_rhashtable_init\n \tif (err)\n \t\tgoto free_rhtab;\n \ndiff --git a/lib/rhashtable.c b/lib/rhashtable.c\nindex d459bef245f4a..f872136ca03c2 100644\n--- a/lib/rhashtable.c\n+++ b/lib/rhashtable.c\n@@ -205,7 +205,12 @@ static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,\n \tif (tbl == NULL)\n \t\treturn NULL;\n \n-\tlockdep_init_map(\u0026tbl-\u003edep_map, \"rhashtable_bucket\", \u0026__key, 0);\n+#ifdef CONFIG_LOCKDEP\n+\tif (ht-\u003edep_key)\n+\t\tlockdep_init_map(\u0026tbl-\u003edep_map, \"rhashtable_bucket\", ht-\u003edep_key, 0);\n+\telse\n+#endif\n+\t\tlockdep_init_map(\u0026tbl-\u003edep_map, \"rhashtable_bucket\", \u0026__key, 0);\n \n \ttbl-\u003esize = size;\n \n@@ -1162,7 +1167,8 @@ static u32 rhashtable_jhash2(const void *key, u32 length, u32 seed)\n  */\n int __rhashtable_init_noprof(struct rhashtable *ht,\n \t\t    const struct rhashtable_params *params,\n-\t\t    struct lock_class_key *key)\n+\t\t    struct lock_class_key *key,\n+\t\t    struct lock_class_key *bucket_key)\n {\n \tstruct bucket_table *tbl;\n \tsize_t size;\n@@ -1176,6 +1182,10 @@ int __rhashtable_init_noprof(struct rhashtable *ht,\n \tspin_lock_init(\u0026ht-\u003elock);\n \tmemcpy(\u0026ht-\u003ep, params, sizeof(*params));\n \n+#ifdef CONFIG_LOCKDEP\n+\tht-\u003edep_key = bucket_key;\n+#endif\n+\n \talloc_tag_record(ht-\u003ealloc_tag);\n \n \tif (params-\u003emin_size)\n@@ -1237,11 +1247,12 @@ EXPORT_SYMBOL_GPL(__rhashtable_init_noprof);\n  */\n int __rhltable_init_noprof(struct rhltable *hlt,\n \t\t\t   const struct rhashtable_params *params,\n-\t\t\t   struct lock_class_key *key)\n+\t\t\t   struct lock_class_key *key,\n+\t\t\t   struct lock_class_key *bucket_key)\n {\n \tint err;\n \n-\terr = __rhashtable_init_noprof(\u0026hlt-\u003eht, params, key);\n+\terr = __rhashtable_init_noprof(\u0026hlt-\u003eht, params, key, bucket_key);\n \thlt-\u003eht.rhlist = true;\n \treturn err;\n }\n"
}
2/1 2026/08/02 22:46 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the initialization of `rhashtable` and `rhltable` to accept an additional `bucket_key` parameter for lockdep tracking. It updates the BPF hash table implementation to use `__lockdep_no_track__` to avoid lockdep warnings. These changes are purely related to lockdep debugging metadata and do not functionally alter the execution flow of the kernel. Therefore, it does not require fuzzing.",
  "WorthFuzzing": false
}

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 e6f4c87cc71f0b6333706307efca3ffb40114576
Author: syz-cluster <triage@syzkaller.com>
Date:   Sun Aug 2 22:46:41 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/linux/rhashtable-types.h b/include/linux/rhashtable-types.h
index 57c11ec9dc645..059f21e37f777 100644
--- a/include/linux/rhashtable-types.h
+++ b/include/linux/rhashtable-types.h
@@ -94,6 +94,9 @@ struct rhashtable {
 	struct mutex                    mutex;
 	spinlock_t			lock;
 	atomic_t			nelems;
+#ifdef CONFIG_LOCKDEP
+	struct lock_class_key	*dep_key;
+#endif
 #ifdef CONFIG_MEM_ALLOC_PROFILING
 	struct alloc_tag		*alloc_tag;
 #endif
@@ -138,23 +141,27 @@ struct rhashtable_iter {
 
 int __rhashtable_init_noprof(struct rhashtable *ht,
 		    const struct rhashtable_params *params,
-		    struct lock_class_key *key);
+		    struct lock_class_key *key,
+		    struct lock_class_key *bucket_key);
 #define rhashtable_init_noprof(ht, params)				\
 ({									\
 	static struct lock_class_key __key;				\
+	static struct lock_class_key __bucket_key;			\
 									\
-	__rhashtable_init_noprof(ht, params, &__key);			\
+	__rhashtable_init_noprof(ht, params, &__key, &__bucket_key);	\
 })
 #define rhashtable_init(...)	alloc_hooks(rhashtable_init_noprof(__VA_ARGS__))
 
 int __rhltable_init_noprof(struct rhltable *hlt,
 		  const struct rhashtable_params *params,
-		  struct lock_class_key *key);
+		  struct lock_class_key *key,
+		  struct lock_class_key *bucket_key);
 #define rhltable_init_noprof(hlt, params)				\
 ({									\
 	static struct lock_class_key __key;				\
+	static struct lock_class_key __bucket_key;			\
 									\
-	__rhltable_init_noprof(hlt, params, &__key);			\
+	__rhltable_init_noprof(hlt, params, &__key, &__bucket_key);	\
 })
 #define rhltable_init(...)	alloc_hooks(rhltable_init_noprof(__VA_ARGS__))
 
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 9f394e1aa2e85..d7e2a601c5c06 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -2822,7 +2822,19 @@ static struct bpf_map *rhtab_map_alloc(union bpf_attr *attr)
 		params.obj_cmpfn = rhtab_key_cmp_long;
 	}
 
-	err = rhashtable_init(&rhtab->ht, &params);
+#ifdef CONFIG_LOCKDEP
+#define bpf_rhashtable_init(ht, params)					\
+	({								\
+		static struct lock_class_key __key;			\
+									\
+		__rhashtable_init_noprof(ht, params, &__key,		\
+					 &__lockdep_no_track__);	\
+	})
+#else
+#define bpf_rhashtable_init(ht, params) rhashtable_init_noprof(ht, params)
+#endif
+	err = alloc_hooks(bpf_rhashtable_init(&rhtab->ht, &params));
+#undef bpf_rhashtable_init
 	if (err)
 		goto free_rhtab;
 
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index d459bef245f4a..f872136ca03c2 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -205,7 +205,12 @@ static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,
 	if (tbl == NULL)
 		return NULL;
 
-	lockdep_init_map(&tbl->dep_map, "rhashtable_bucket", &__key, 0);
+#ifdef CONFIG_LOCKDEP
+	if (ht->dep_key)
+		lockdep_init_map(&tbl->dep_map, "rhashtable_bucket", ht->dep_key, 0);
+	else
+#endif
+		lockdep_init_map(&tbl->dep_map, "rhashtable_bucket", &__key, 0);
 
 	tbl->size = size;
 
@@ -1162,7 +1167,8 @@ static u32 rhashtable_jhash2(const void *key, u32 length, u32 seed)
  */
 int __rhashtable_init_noprof(struct rhashtable *ht,
 		    const struct rhashtable_params *params,
-		    struct lock_class_key *key)
+		    struct lock_class_key *key,
+		    struct lock_class_key *bucket_key)
 {
 	struct bucket_table *tbl;
 	size_t size;
@@ -1176,6 +1182,10 @@ int __rhashtable_init_noprof(struct rhashtable *ht,
 	spin_lock_init(&ht->lock);
 	memcpy(&ht->p, params, sizeof(*params));
 
+#ifdef CONFIG_LOCKDEP
+	ht->dep_key = bucket_key;
+#endif
+
 	alloc_tag_record(ht->alloc_tag);
 
 	if (params->min_size)
@@ -1237,11 +1247,12 @@ EXPORT_SYMBOL_GPL(__rhashtable_init_noprof);
  */
 int __rhltable_init_noprof(struct rhltable *hlt,
 			   const struct rhashtable_params *params,
-			   struct lock_class_key *key)
+			   struct lock_class_key *key,
+			   struct lock_class_key *bucket_key)
 {
 	int err;
 
-	err = __rhashtable_init_noprof(&hlt->ht, params, key);
+	err = __rhashtable_init_noprof(&hlt->ht, params, key, bucket_key);
 	hlt->ht.rhlist = true;
 	return err;
 }

3/2 2026/08/02 22:46 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3571
							output: 120
							thoughts: 1622

Thoughts: 
**Lockdep Tracking for rhashtable Buckets**

Okay, so this patch is all about enhancing lockdep within the `rhashtable` implementation. My initial read confirms this: we're passing an extra `bucket_key` to the initialization functions `__rhashtable_init_noprof` and `__rhltable_init_noprof`, and their macros. It also modifies the BPF hash table implementation (`kernel/bpf/hashtab.c`) to use `__lockdep_no_track__`, which is clearly a lockdep construct, given my familiarity with the kernel.

Digging in, the core of the change lies in adding this `bucket_key` parameter. This key is then used with `lockdep_init_map` when `CONFIG_LOCKDEP` is enabled, and stored in the `ht->dep_key` field, also only present when lockdep is active. So, without lockdep, the extra parameter is passed, but effectively ignored.

Looking closely at `kernel/bpf/hashtab.c`, this macro just calls `__rhashtable_init_noprof` with `__lockdep_no_track__`, which signals that the bucket locks should not be tracked by lockdep. This is the only functional change.

Now, the crucial question is whether this merits fuzzing. Given the nature of these modifications—purely lockdep annotations, debugging metadata essentially—I can confidently say no. These changes don't alter the program's execution flow. They're about how lockdep *tracks* things, not what the program *does*. According to my understanding of the fuzzing scope, it is not worth fuzzing since it does not functionally alter the execution flow. I am certain that WorthFuzzing=false.

So, in summary, this patch is a lockdep-focused change, and doesn't warrant further fuzzing efforts.

4/2 2026/08/02 22:46 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the initialization of `rhashtable` and `rhltable` to accept an additional `bucket_key` parameter for lockdep tracking. It updates the BPF hash table implementation to use `__lockdep_no_track__` to avoid lockdep warnings. These changes are purely related to lockdep debugging metadata and do not functionally alter the execution flow of the kernel. Therefore, it does not require fuzzing.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the initialization of `rhashtable` and `rhltable` to accept an additional `bucket_key` parameter for lockdep tracking. It updates the BPF hash table implementation to use `__lockdep_no_track__` to avoid lockdep warnings. These changes are purely related to lockdep debugging metadata and do not functionally alter the execution flow of the kernel. Therefore, it does not require fuzzing.",
  "WorthFuzzing": false
}
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)