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KCSAN: data-race in atime_needs_update / touch_atime (2)

Status: moderation: reported on 2024/02/02 01:17
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+22e9f4940fef7f9a657a@syzkaller.appspotmail.com
First crash: 853d, last: 7h44m
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision Error
76f368c1-71f0-4622-9bbf-9161f71b68bd assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KCSAN: data-race in atime_needs_update / touch_atime (2) 2026/05/16 16:05 2026/05/16 17:16 2026/05/16 17:40 de5aae85e5f28e2fa1c7deefcc24fe286abe5140
0279f0b4-4e82-4b07-9805-a1e13df8f9cd repro ❓ KCSAN: data-race in atime_needs_update / touch_atime (2) 2026/03/07 22:24 2026/03/07 22:24 2026/03/07 22:31 31e9c887f7dc24e04b3ca70d0d54fc34141844b0
7171d4d8-42ef-4fd5-a999-5aa18ef5eb74 assessment-kcsan Benign: ✅ Confident: ✅ ❓ KCSAN: data-race in atime_needs_update / touch_atime (2) 2026/02/24 21:08 2026/02/24 21:08 2026/02/24 21:11 305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
ec112e07-5373-4eb0-b039-94f19981efb8 assessment-kcsan 💥 KCSAN: data-race in atime_needs_update / touch_atime (2) 2026/01/10 03:13 2026/01/10 03:13 2026/01/10 03:13 7519916073b761ced56a7b15fdeeb4674e8dc125 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. * Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0, Status: RESOURCE_EXHAUSTED, Details: [map[@type:type.googleapis.com/google.rpc.Help links:[map[description:Learn more about Gemini API quotas url:https://ai.google.dev/gemini-api/docs/rate-limits]]] map[@type:type.googleapis.com/google.rpc.QuotaFailure violations:[map[quotaId:GenerateRequestsPerDayPerProjectPerModel quotaMetric:generativelanguage.googleapis.com/generate_requests_per_model_per_day]]] map[@type:type.googleapis.com/google.rpc.DebugInfo detail:[ORIGINAL ERROR] generic::resource_exhausted: 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. * Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0 [google.rpc.error_details_ext] { 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. \n* Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0" details { type_url: "type.googleapis.com/language_labs.genai.debug.GeminiApiDebugInfo" value: "RM\nK\nEgenerativelanguage.googleapis.com/generate_requests_per_model_per_day\030\000\"\000" } details { [type.googleapis.com/google.rpc.Help] { links { description: "Learn more about Gemini API quotas" url: "https://ai.google.dev/gemini-api/docs/rate-limits" } } } details { [type.googleapis.com/google.rpc.QuotaFailure] { violations { quota_metric: "generativelanguage.googleapis.com/generate_requests_per_model_per_day" quota_id: "GenerateRequestsPerDayPerProjectPerModel" } } } }]]
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in atime_needs_update / touch_atime ext4 6 19 989d 1010d 0/29 auto-obsoleted due to no activity on 2023/10/17 00:18

Sample crash report:
==================================================================
BUG: KCSAN: data-race in atime_needs_update / touch_atime

read to 0xffff88811bb0d3b8 of 4 bytes by task 3292 on cpu 1:
 atime_needs_update+0x25f/0x3e0 fs/inode.c:-1
 touch_atime+0x4a/0x330 fs/inode.c:2253
 file_accessed include/linux/fs.h:2264 [inline]
 shmem_file_read_iter+0x3f4/0x4b0 mm/shmem.c:3458
 new_sync_read fs/read_write.c:493 [inline]
 vfs_read+0x6c0/0x7f0 fs/read_write.c:574
 ksys_read+0xdc/0x1a0 fs/read_write.c:717
 __do_sys_read fs/read_write.c:726 [inline]
 __se_sys_read fs/read_write.c:724 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:724
 x64_sys_call+0x2886/0x3020 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88811bb0d3b8 of 4 bytes by task 3289 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1626 [inline]
 inode_update_atime fs/inode.c:2098 [inline]
 inode_update_time fs/inode.c:2162 [inline]
 generic_update_time fs/inode.c:2195 [inline]
 touch_atime+0x1d7/0x330 fs/inode.c:2273
 file_accessed include/linux/fs.h:2264 [inline]
 shmem_file_read_iter+0x3f4/0x4b0 mm/shmem.c:3458
 new_sync_read fs/read_write.c:493 [inline]
 vfs_read+0x6c0/0x7f0 fs/read_write.c:574
 ksys_read+0xdc/0x1a0 fs/read_write.c:717
 __do_sys_read fs/read_write.c:726 [inline]
 __se_sys_read fs/read_write.c:724 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:724
 x64_sys_call+0x2886/0x3020 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0f584de9 -> 0x15316d05

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3289 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================

Crashes (648):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/03 17:48 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/06/01 23:46 upstream e43ffb69e043 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/27 23:19 upstream eb3f4b7426cf 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/26 07:24 upstream e8c2f9fdadee c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/24 07:00 upstream 4cbfe4502e3d c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/23 21:03 upstream eed108edc117 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/22 18:04 upstream 45255ea1ca09 5f091fcc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/20 20:46 upstream df685633c3db 62fb93a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/16 10:10 upstream d458a240344c a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/16 03:08 upstream d458a240344c 81fb92f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/15 01:59 upstream 66182ca873a4 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/13 11:38 upstream 1d5dcaa3bd65 fec2a7ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/12 08:35 upstream 50897c955902 07aeade5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/11 10:05 upstream 5d6919055dec 845acb1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/10 10:32 upstream 1bfaee9d3351 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/08 18:36 upstream 917719c412c4 b2988c17 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/08 03:04 upstream fcee7d82f27d 5633175a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/07 17:55 upstream 8ab992f815d6 cbf9e0fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/05 15:05 upstream a293ec25d59d 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/05 02:25 upstream c7e4e4d5f7dc a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/03 20:36 upstream f377d0025eb0 a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/02 20:45 upstream f1a5e78a55eb a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/05/01 03:39 upstream 26fd6bff2c05 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/30 14:44 upstream e75a43c7cec4 a7464baf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/30 12:36 upstream e75a43c7cec4 a7464baf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/30 03:59 upstream 57b8e2d666a3 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/29 14:26 upstream dca922e019dd 7ca9e4d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/28 10:56 upstream 3b3bea6d4b9c ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/28 06:04 upstream 3b3bea6d4b9c ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/27 20:59 upstream 254f49634ee1 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/26 14:04 upstream 897d54018cc9 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/25 01:17 upstream 27d128c1cff6 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/24 00:57 upstream 45dcf5e28813 9cfb3ca7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/20 07:35 upstream c1f49dea2b8f 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/19 00:05 upstream eb5249b12507 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/16 14:24 upstream 1d51b370a0f8 4743f87d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/13 20:55 upstream 26ff969926a0 9530ccf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/13 13:34 upstream 028ef9c96e96 9530ccf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/12 01:48 upstream e753c16cb3dd 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/10 20:52 upstream 7c6c4ed80b87 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/09 16:27 upstream 8b02520ec5f7 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/09 04:53 upstream 7f87a5ea75f0 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/08 01:39 upstream 3036cd0d3328 2c961e87 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/07 20:49 upstream 3036cd0d3328 628666c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/07 08:55 upstream bfe62a454542 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/05 22:06 upstream 1791c390149f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/05 03:45 upstream 3aae9383f42f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/03 23:56 upstream d8a9a4b11a13 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/03 07:13 upstream 5619b098e2fb 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/04/02 21:49 upstream 5619b098e2fb 91bc79b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/03/07 19:50 upstream 4ae12d8bd9a8 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/02/24 11:31 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2026/01/09 20:34 upstream 372800cb95a3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
2024/02/02 01:16 upstream 5c24e4e9e708 d61103fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in atime_needs_update / touch_atime
* Struck through repros no longer work on HEAD.