| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/07/13 07:33 | flow | patch-triage |
0mArgs:null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch is a pure refactoring that introduces a helper function `mm_slot_remove` to replace repeated code for removing an `mm_slot` from a hash table and a list. It also renames macro arguments in `mm_slot.h`. There are no functional changes to the execution flow.",
"WorthFuzzing": false
} |
| 1/1 | 2026/07/13 07:33 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit fd4309459e65de6089fa0d8d63e13c6791ad63c6\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Jul 13 07:33:36 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/mm/khugepaged.c b/mm/khugepaged.c\nindex 45e8245d80dadf..27e8f3077e80fe 100644\n--- a/mm/khugepaged.c\n+++ b/mm/khugepaged.c\n@@ -606,8 +606,7 @@ void __khugepaged_exit(struct mm_struct *mm)\n \tspin_lock(\u0026khugepaged_mm_lock);\n \tslot = mm_slot_lookup(mm_slots_hash, mm);\n \tif (slot \u0026\u0026 khugepaged_scan.mm_slot != slot) {\n-\t\thash_del(\u0026slot-\u003ehash);\n-\t\tlist_del(\u0026slot-\u003emm_node);\n+\t\tmm_slot_remove(slot);\n \t\tfree = 1;\n \t}\n \tspin_unlock(\u0026khugepaged_mm_lock);\n@@ -1802,8 +1801,7 @@ static void collect_mm_slot(struct mm_slot *slot)\n \n \tif (collapse_test_exit(mm)) {\n \t\t/* free mm_slot */\n-\t\thash_del(\u0026slot-\u003ehash);\n-\t\tlist_del(\u0026slot-\u003emm_node);\n+\t\tmm_slot_remove(slot);\n \n \t\t/*\n \t\t * Not strictly needed because the mm exited already.\ndiff --git a/mm/ksm.c b/mm/ksm.c\nindex 14550f69cf020c..47006f494fcb1b 100644\n--- a/mm/ksm.c\n+++ b/mm/ksm.c\n@@ -1257,8 +1257,7 @@ static int unmerge_and_remove_all_rmap_items(void)\n \t\t\t\t struct mm_slot, mm_node);\n \t\tksm_scan.mm_slot = mm_slot_entry(slot, struct ksm_mm_slot, slot);\n \t\tif (ksm_test_exit(mm)) {\n-\t\t\thash_del(\u0026mm_slot-\u003eslot.hash);\n-\t\t\tlist_del(\u0026mm_slot-\u003eslot.mm_node);\n+\t\t\tmm_slot_remove(\u0026mm_slot-\u003eslot);\n \t\t\tspin_unlock(\u0026ksm_mmlist_lock);\n \n \t\t\tmm_slot_free(mm_slot_cache, mm_slot);\n@@ -2772,8 +2771,7 @@ static struct ksm_rmap_item *scan_get_next_rmap_item(struct page **page)\n \t\t * or when all VM_MERGEABLE areas have been unmapped (and\n \t\t * mmap_lock then protects against race with MADV_MERGEABLE).\n \t\t */\n-\t\thash_del(\u0026mm_slot-\u003eslot.hash);\n-\t\tlist_del(\u0026mm_slot-\u003eslot.mm_node);\n+\t\tmm_slot_remove(\u0026mm_slot-\u003eslot);\n \t\tspin_unlock(\u0026ksm_mmlist_lock);\n \n \t\tmm_slot_free(mm_slot_cache, mm_slot);\n@@ -3116,8 +3114,7 @@ void __ksm_exit(struct mm_struct *mm)\n \tif (ksm_scan.mm_slot == mm_slot)\n \t\tgoto unlock;\n \tif (!mm_slot-\u003ermap_list) {\n-\t\thash_del(\u0026slot-\u003ehash);\n-\t\tlist_del(\u0026slot-\u003emm_node);\n+\t\tmm_slot_remove(slot);\n \t\teasy_to_free = 1;\n \t} else {\n \t\tlist_move(\u0026slot-\u003emm_node,\ndiff --git a/mm/mm_slot.h b/mm/mm_slot.h\nindex 83f18ed1c4bde7..710c70166c7937 100644\n--- a/mm/mm_slot.h\n+++ b/mm/mm_slot.h\n@@ -33,12 +33,17 @@ static inline void mm_slot_free(struct kmem_cache *cache, void *objp)\n \tkmem_cache_free(cache, objp);\n }\n \n-#define mm_slot_lookup(_hashtable, _mm) \t\t\t\t \\\n+/*\n+ * Note: mm_slot_lookup and mm_slot_insert cannot be converted to static inline\n+ * functions because hash_for_each_possible relys on the actual array argument\n+ * 'hashtable' for sizeof() instead of pointers.\n+ */\n+#define mm_slot_lookup(hashtable, mm)\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n \tstruct mm_slot *tmp_slot, *mm_slot = NULL;\t\t\t \\\n \t\t\t\t\t\t\t\t\t \\\n-\thash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \\\n-\t\tif (_mm == tmp_slot-\u003emm) {\t\t\t\t \\\n+\thash_for_each_possible(hashtable, tmp_slot, hash, (unsigned long)mm) \\\n+\t\tif (mm == tmp_slot-\u003emm) {\t\t\t\t \\\n \t\t\tmm_slot = tmp_slot;\t\t\t\t \\\n \t\t\tbreak;\t\t\t\t\t\t \\\n \t\t}\t\t\t\t\t\t\t \\\n@@ -46,10 +51,15 @@ static inline void mm_slot_free(struct kmem_cache *cache, void *objp)\n \tmm_slot;\t\t\t\t\t\t\t \\\n })\n \n-#define mm_slot_insert(_hashtable, _mm, _mm_slot)\t\t\t \\\n+#define mm_slot_insert(hashtable, mm, mm_slot)\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n-\t_mm_slot-\u003emm = _mm;\t\t\t\t\t\t \\\n-\thash_add(_hashtable, \u0026_mm_slot-\u003ehash, (unsigned long)_mm);\t \\\n+\tmm_slot-\u003emm = mm;\t\t\t\t\t\t \\\n+\thash_add(hashtable, \u0026mm_slot-\u003ehash, (unsigned long)mm);\t\t \\\n })\n \n+static inline void mm_slot_remove(struct mm_slot *slot)\n+{\n+\thash_del(\u0026slot-\u003ehash);\n+\tlist_del(\u0026slot-\u003emm_node);\n+}\n #endif /* _LINUX_MM_SLOT_H */\n"
} |
| 2/1 | 2026/07/13 07:33 | agent | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch is a pure refactoring that introduces a helper function `mm_slot_remove` to replace repeated code for removing an `mm_slot` from a hash table and a list. It also renames macro arguments in `mm_slot.h`. There are no functional changes to the execution flow.",
"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). 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. 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. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. 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 fd4309459e65de6089fa0d8d63e13c6791ad63c6
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Jul 13 07:33:36 2026 +0000
syz-cluster: applied patch under review
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 45e8245d80dadf..27e8f3077e80fe 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -606,8 +606,7 @@ void __khugepaged_exit(struct mm_struct *mm)
spin_lock(&khugepaged_mm_lock);
slot = mm_slot_lookup(mm_slots_hash, mm);
if (slot && khugepaged_scan.mm_slot != slot) {
- hash_del(&slot->hash);
- list_del(&slot->mm_node);
+ mm_slot_remove(slot);
free = 1;
}
spin_unlock(&khugepaged_mm_lock);
@@ -1802,8 +1801,7 @@ static void collect_mm_slot(struct mm_slot *slot)
if (collapse_test_exit(mm)) {
/* free mm_slot */
- hash_del(&slot->hash);
- list_del(&slot->mm_node);
+ mm_slot_remove(slot);
/*
* Not strictly needed because the mm exited already.
diff --git a/mm/ksm.c b/mm/ksm.c
index 14550f69cf020c..47006f494fcb1b 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1257,8 +1257,7 @@ static int unmerge_and_remove_all_rmap_items(void)
struct mm_slot, mm_node);
ksm_scan.mm_slot = mm_slot_entry(slot, struct ksm_mm_slot, slot);
if (ksm_test_exit(mm)) {
- hash_del(&mm_slot->slot.hash);
- list_del(&mm_slot->slot.mm_node);
+ mm_slot_remove(&mm_slot->slot);
spin_unlock(&ksm_mmlist_lock);
mm_slot_free(mm_slot_cache, mm_slot);
@@ -2772,8 +2771,7 @@ static struct ksm_rmap_item *scan_get_next_rmap_item(struct page **page)
* or when all VM_MERGEABLE areas have been unmapped (and
* mmap_lock then protects against race with MADV_MERGEABLE).
*/
- hash_del(&mm_slot->slot.hash);
- list_del(&mm_slot->slot.mm_node);
+ mm_slot_remove(&mm_slot->slot);
spin_unlock(&ksm_mmlist_lock);
mm_slot_free(mm_slot_cache, mm_slot);
@@ -3116,8 +3114,7 @@ void __ksm_exit(struct mm_struct *mm)
if (ksm_scan.mm_slot == mm_slot)
goto unlock;
if (!mm_slot->rmap_list) {
- hash_del(&slot->hash);
- list_del(&slot->mm_node);
+ mm_slot_remove(slot);
easy_to_free = 1;
} else {
list_move(&slot->mm_node,
diff --git a/mm/mm_slot.h b/mm/mm_slot.h
index 83f18ed1c4bde7..710c70166c7937 100644
--- a/mm/mm_slot.h
+++ b/mm/mm_slot.h
@@ -33,12 +33,17 @@ static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
kmem_cache_free(cache, objp);
}
-#define mm_slot_lookup(_hashtable, _mm) \
+/*
+ * Note: mm_slot_lookup and mm_slot_insert cannot be converted to static inline
+ * functions because hash_for_each_possible relys on the actual array argument
+ * 'hashtable' for sizeof() instead of pointers.
+ */
+#define mm_slot_lookup(hashtable, mm) \
({ \
struct mm_slot *tmp_slot, *mm_slot = NULL; \
\
- hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \
- if (_mm == tmp_slot->mm) { \
+ hash_for_each_possible(hashtable, tmp_slot, hash, (unsigned long)mm) \
+ if (mm == tmp_slot->mm) { \
mm_slot = tmp_slot; \
break; \
} \
@@ -46,10 +51,15 @@ static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
mm_slot; \
})
-#define mm_slot_insert(_hashtable, _mm, _mm_slot) \
+#define mm_slot_insert(hashtable, mm, mm_slot) \
({ \
- _mm_slot->mm = _mm; \
- hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm); \
+ mm_slot->mm = mm; \
+ hash_add(hashtable, &mm_slot->hash, (unsigned long)mm); \
})
+static inline void mm_slot_remove(struct mm_slot *slot)
+{
+ hash_del(&slot->hash);
+ list_del(&slot->mm_node);
+}
#endif /* _LINUX_MM_SLOT_H */
|
| 3/2 | 2026/07/13 07:33 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3153 output: 94 thoughts: 302 Thoughts: **Refactoring Review: mm_slot Helper Function**
Okay, so I'm looking at this patch. It seems like a pretty straightforward refactoring exercise. They've introduced a new helper function, `mm_slot_remove`, in `mm/mm_slot.h`. And the primary change involves replacing those two lines of code – the `hash_del` and `list_del` calls for the `mm_slot` – with a call to this new helper function. This replacement happens in both `mm/khugepaged.c` and `mm/ksm.c`. Additionally, they've renamed a few arguments in the `mm_slot_lookup` and `mm_slot_insert` macros in the same header file, removing the leading underscores.
My first thought is always, "Is this worth fuzzing?" Let's analyze. There are no changes to the execution flow; it's purely about code organization and readability. The introduced function simply encapsulates two repeated lines. Functionally, the system behaves exactly the same. No new vulnerabilities are likely to arise from this.
I'll double-check the actual code changes. Yep, it's just as I expected. They've essentially replaced the inline `hash_del` and `list_del` with the helper. I can see the exact code in the diff:
```c
static inline void mm_slot_remove(struct mm_slot *slot)
{
hash_del(&slot->hash);
list_del(&slot->mm_node);
}
```
Then in both `khugepaged.c` and `ksm.c`:
```c
- hash_del(&slot->hash);
- list_del(&slot->mm_node);
+ mm_slot_remove(slot);
```
This is purely a refactoring operation. It isn't going to have any impact on functional behavior or introduce any security vulnerabilities. Thus, I'm confident in setting `WorthFuzzing=false`.
|
| 4/2 | 2026/07/13 07:33 | tool | set-results |
0mArgs:{
"EnableConfigs": [],
"FocusSymbols": [],
"Reasoning": "The patch is a pure refactoring that introduces a helper function `mm_slot_remove` to replace repeated code for removing an `mm_slot` from a hash table and a list. It also renames macro arguments in `mm_slot.h`. There are no functional changes to the execution flow.",
"WorthFuzzing": false
}Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch is a pure refactoring that introduces a helper function `mm_slot_remove` to replace repeated code for removing an `mm_slot` from a hash table and a list. It also renames macro arguments in `mm_slot.h`. There are no functional changes to the execution flow.",
"WorthFuzzing": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|