syzbot

unknown

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unknown

map[KernelSrc:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/src/106a61212524ca678ddd314a6d8486c315d17d41]

unknown

map[KernelObj:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/build/3f62dd304c077286b05fe707ac1660b9646a0c11]

unknown

map[Index:codesearch-index]

unknown

Error 429, Message: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. 
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You are an experienced Linux kernel developer tasked with determining if the given kernel
data race is benign or not. The data race report is from KCSAN tool.
It contains 2 stack traces of the memory accesses that constitute a data race.

The report would be non-actionable, if the underlysing data race is "benign".
That is, the race is on a simple int/bool or similar field, and the accesses
are not supposed to be protected by any mutual exclusion primitives.
Common examples of such "benign" data races are accesses to various flags fields,
statistics counters, and similar.
An actionable race is "harmful", that is can lead to corruption/crash even with
a conservative compiler that compiles memory accesses to primitive types
effectively as atomic. A common example of a "harmful" data races is race on
a complex container (list/hashmap/etc), where accesses are supposed to be protected
by a mutual exclusion primitive.
In the final reply explain why you think the report is consistent and the data race is harmful.

Use the provided tools to confirm any assumptions, what variables/fields being accessed, etc.
In particular, don't make assumptions about the kernel source code,
use codesearch tools to read the actual source code.


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.

The data race report is:

==================================================================
BUG: KCSAN: data-race in wb_wait_for_completion / writeback_sb_inodes

write to 0xffffc900113f7de8 of 8 bytes by task 7058 on cpu 1:
 wb_wait_for_completion_cb fs/fs-writeback.c:203 [inline]
 wb_wait_for_completion+0x1b9/0x360 fs/fs-writeback.c:226
 sync_inodes_sb+0x120/0x460 fs/fs-writeback.c:2894
 sync_inodes_one_sb+0x3d/0x50 fs/sync.c:77
 __iterate_supers+0x110/0x220 fs/super.c:924
 iterate_supers+0x1f/0x30 fs/super.c:939
 ksys_sync+0x5c/0xe0 fs/sync.c:102
 __ia32_sys_sync+0xe/0x20 fs/sync.c:113
 x64_sys_call+0x29b2/0x3000 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc900113f7de8 of 8 bytes by task 4150 on cpu 0:
 writeback_sb_inodes+0x4ce/0xb20 fs/fs-writeback.c:2033
 wb_writeback+0x252/0x5c0 fs/fs-writeback.c:2216
 wb_do_writeback fs/fs-writeback.c:2363 [inline]
 wb_workfn+0x194/0x910 fs/fs-writeback.c:2403
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x00000000ffffb295 -> 0x00000000ffffb29a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4150 Comm: kworker/u8:21 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-8:0)
==================================================================

unknown

Error 429, Message: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. 
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