AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/07/26 11:41 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the ext4 logging functions (__ext4_msg and ext4_msg) to change how the log level is passed and printed. This is a purely decorative/logging change that does not alter any functional execution flow.",
  "WorthFuzzing": false
}
1/1 2026/07/26 11:41 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 2e963a836149b4e412178c381093c73b73042a78\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sun Jul 26 11:41:49 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex b37c136ea3ab33..981918f32067a1 100644\n--- a/fs/ext4/ext4.h\n+++ b/fs/ext4/ext4.h\n@@ -3309,8 +3309,8 @@ void __ext4_warning(struct super_block *, const char *, unsigned int,\n extern __printf(4, 5)\n void __ext4_warning_inode(const struct inode *inode, const char *function,\n \t\t\t  unsigned int line, const char *fmt, ...);\n-extern __printf(3, 4)\n-void __ext4_msg(struct super_block *, const char *, const char *, ...);\n+extern __printf(2, 3)\n+void __ext4_msg(struct super_block *, const char *fmt, ...);\n extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,\n \t\t\t   const char *, unsigned int, const char *);\n extern __printf(7, 8)\n@@ -3354,8 +3354,8 @@ void __ext4_grp_locked_error(const char *, unsigned int,\n \t__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)\n #define ext4_warning_inode(inode, fmt, ...)\t\t\t\t\\\n \t__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)\n-#define ext4_msg(sb, level, fmt, ...)\t\t\t\t\\\n-\t__ext4_msg(sb, level, fmt, ##__VA_ARGS__)\n+#define ext4_msg(sb, level, fmt, ...)\t\t\t\t\t\\\n+\t__ext4_msg(sb, level fmt, ##__VA_ARGS__)\n #define dump_mmp_msg(sb, mmp, msg)\t\t\t\t\t\\\n \t__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)\n #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)\t\t\\\n@@ -3401,8 +3401,8 @@ do {\t\t\t\t\t\t\t\t\t\\\n } while (0)\n #define ext4_msg(sb, level, fmt, ...)\t\t\t\t\t\\\n do {\t\t\t\t\t\t\t\t\t\\\n-\tno_printk(fmt, ##__VA_ARGS__);\t\t\t\t\t\\\n-\t__ext4_msg(sb, \"\", \" \");\t\t\t\t\t\\\n+\tno_printk(level fmt, ##__VA_ARGS__);\t\t\t\t\\\n+\t__ext4_msg(sb, \"\" \" \");\t\t\t\t\t\t\\\n } while (0)\n #define dump_mmp_msg(sb, mmp, msg)\t\t\t\t\t\\\n \t__dump_mmp_msg(sb, mmp, \"\", 0, \"\")\ndiff --git a/fs/ext4/super.c b/fs/ext4/super.c\nindex 245f67d10ded34..72d6f6353a270a 100644\n--- a/fs/ext4/super.c\n+++ b/fs/ext4/super.c\n@@ -981,11 +981,11 @@ void __ext4_std_error(struct super_block *sb, const char *function,\n \text4_handle_error(sb, false, -errno, 0, 0, function, line);\n }\n \n-void __ext4_msg(struct super_block *sb,\n-\t\tconst char *prefix, const char *fmt, ...)\n+void __ext4_msg(struct super_block *sb, const char *fmt, ...)\n {\n \tstruct va_format vaf;\n \tva_list args;\n+\tint level;\n \n \tif (sb) {\n \t\tatomic_inc(\u0026EXT4_SB(sb)-\u003es_msg_count);\n@@ -995,12 +995,16 @@ void __ext4_msg(struct super_block *sb,\n \t}\n \n \tva_start(args, fmt);\n-\tvaf.fmt = fmt;\n+\n+\tlevel = printk_get_level(fmt);\n+\tvaf.fmt = printk_skip_level(fmt);\n \tvaf.va = \u0026args;\n \tif (sb)\n-\t\tprintk(\"%sEXT4-fs (%s): %pV\\n\", prefix, sb-\u003es_id, \u0026vaf);\n+\t\tprintk(\"%c%cEXT4-fs (%s): %pV\\n\",\n+\t\t       KERN_SOH_ASCII, level, sb-\u003es_id, \u0026vaf);\n \telse\n-\t\tprintk(\"%sEXT4-fs: %pV\\n\", prefix, \u0026vaf);\n+\t\tprintk(\"%c%cEXT4-fs: %pV\\n\",\n+\t\t       KERN_SOH_ASCII, level, \u0026vaf);\n \tva_end(args);\n }\n \n"
}
2/1 2026/07/26 11:41 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the ext4 logging functions (__ext4_msg and ext4_msg) to change how the log level is passed and printed. This is a purely decorative/logging change that does not alter any functional 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).
- 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 2e963a836149b4e412178c381093c73b73042a78
Author: syz-cluster <triage@syzkaller.com>
Date:   Sun Jul 26 11:41:49 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b37c136ea3ab33..981918f32067a1 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3309,8 +3309,8 @@ void __ext4_warning(struct super_block *, const char *, unsigned int,
 extern __printf(4, 5)
 void __ext4_warning_inode(const struct inode *inode, const char *function,
 			  unsigned int line, const char *fmt, ...);
-extern __printf(3, 4)
-void __ext4_msg(struct super_block *, const char *, const char *, ...);
+extern __printf(2, 3)
+void __ext4_msg(struct super_block *, const char *fmt, ...);
 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
 			   const char *, unsigned int, const char *);
 extern __printf(7, 8)
@@ -3354,8 +3354,8 @@ void __ext4_grp_locked_error(const char *, unsigned int,
 	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
 #define ext4_warning_inode(inode, fmt, ...)				\
 	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
-#define ext4_msg(sb, level, fmt, ...)				\
-	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)
+#define ext4_msg(sb, level, fmt, ...)					\
+	__ext4_msg(sb, level fmt, ##__VA_ARGS__)
 #define dump_mmp_msg(sb, mmp, msg)					\
 	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\
@@ -3401,8 +3401,8 @@ do {									\
 } while (0)
 #define ext4_msg(sb, level, fmt, ...)					\
 do {									\
-	no_printk(fmt, ##__VA_ARGS__);					\
-	__ext4_msg(sb, "", " ");					\
+	no_printk(level fmt, ##__VA_ARGS__);				\
+	__ext4_msg(sb, "" " ");						\
 } while (0)
 #define dump_mmp_msg(sb, mmp, msg)					\
 	__dump_mmp_msg(sb, mmp, "", 0, "")
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 245f67d10ded34..72d6f6353a270a 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -981,11 +981,11 @@ void __ext4_std_error(struct super_block *sb, const char *function,
 	ext4_handle_error(sb, false, -errno, 0, 0, function, line);
 }
 
-void __ext4_msg(struct super_block *sb,
-		const char *prefix, const char *fmt, ...)
+void __ext4_msg(struct super_block *sb, const char *fmt, ...)
 {
 	struct va_format vaf;
 	va_list args;
+	int level;
 
 	if (sb) {
 		atomic_inc(&EXT4_SB(sb)->s_msg_count);
@@ -995,12 +995,16 @@ void __ext4_msg(struct super_block *sb,
 	}
 
 	va_start(args, fmt);
-	vaf.fmt = fmt;
+
+	level = printk_get_level(fmt);
+	vaf.fmt = printk_skip_level(fmt);
 	vaf.va = &args;
 	if (sb)
-		printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+		printk("%c%cEXT4-fs (%s): %pV\n",
+		       KERN_SOH_ASCII, level, sb->s_id, &vaf);
 	else
-		printk("%sEXT4-fs: %pV\n", prefix, &vaf);
+		printk("%c%cEXT4-fs: %pV\n",
+		       KERN_SOH_ASCII, level, &vaf);
 	va_end(args);
 }

3/2 2026/07/26 11:41 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3053
							output: 79
							thoughts: 219

Thoughts: 
**Analyzing the EXT4 Logging Changes**

Okay, so this patch is focused solely on the messaging system within the EXT4 filesystem code. It's targeting the `__ext4_msg` and `ext4_msg` macros, specifically within `fs/ext4/ext4.h` and `fs/ext4/super.c`. My initial assessment is that this is purely cosmetic, but I need to be thorough.

It looks like the `__ext4_msg` macro is getting its signature tweaked. Instead of passing the log level as a distinct argument, it's now being incorporated directly into the format string (`fmt`). And the `ext4_msg` macro is being updated to handle the concatenation of `level` and `fmt`. So, the way messages are *printed* is changing, but the underlying execution flow – the functional aspects of the filesystem – remains untouched. This is purely about how things are logged and presented.

Let me confirm my hypothesis. Yup, `__ext4_msg` is indeed used for logging. The change essentially streamlines how the log level is handled, moving it into the format string itself. Given this is purely a logging modification, a simple conclusion presents itself. This patch does not alter the fundamental execution path, and therefore, fuzzing it isn't necessary. `WorthFuzzing = false`.

4/2 2026/07/26 11:41 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the ext4 logging functions (__ext4_msg and ext4_msg) to change how the log level is passed and printed. This is a purely decorative/logging change that does not alter any functional execution flow.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the ext4 logging functions (__ext4_msg and ext4_msg) to change how the log level is passed and printed. This is a purely decorative/logging change that does not alter any functional execution flow.",
  "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)