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KCSAN: data-race in fifo_open / wait_for_partner (6)

Status: moderation: reported on 2025/07/15 11:21
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+4cec0207aa959dfb97a4@syzkaller.appspotmail.com
First crash: 334d, last: 1d22h
▶ ▼ ✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision Error
004b7686-5a40-442e-8288-09eb789c821c assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KCSAN: data-race in fifo_open / wait_for_partner (6) 2026/06/01 09:00 2026/06/01 09:00 2026/06/01 10:04 6b4a844333e83556da95d61d7f207e7ef5cd4bc6
cd0bde89-ac55-4f4f-9dcf-999fb8edc148 assessment-security 💥 KCSAN: data-race in fifo_open / wait_for_partner (6) 2026/05/15 10:49 2026/05/15 10:49 2026/05/15 10:50 9cd3beaadf14b3a22d15fd97a0bf081ee41ebe01 failed to run ["git" "-c" "core.hooksPath=/dev/null" "checkout" "70eda68668d1476b459b64e69b8f36659fa9dfa8"]: exit status 128 fatal: sha1 file '/app/workdir/repo/linux/.git/index.lock' write error. Out of diskspace
d777c1d4-c216-457b-8430-5c65a6a546ef repro ❓ KCSAN: data-race in fifo_open / wait_for_partner (6) 2026/03/07 13:26 2026/03/07 13:26 2026/03/07 13:28 31e9c887f7dc24e04b3ca70d0d54fc34141844b0
d60c3131-531b-437f-95e3-2b11f5abd866 assessment-kcsan Benign: ✅ Confident: ✅ ❓ KCSAN: data-race in fifo_open / wait_for_partner (6) 2026/02/24 19:35 2026/02/24 19:35 2026/02/24 19:38 305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
317659bc-c5e1-434c-9978-056831b18af7 assessment-kcsan 💥 KCSAN: data-race in fifo_open / wait_for_partner (6) 2026/01/10 00:59 2026/01/10 00:59 2026/01/10 00:59 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 (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in fifo_open / wait_for_partner (5) fs 6 5 741d 805d 0/29 auto-obsoleted due to no activity on 2024/07/08 17:39
upstream KCSAN: data-race in fifo_open / wait_for_partner (3) fs 6 3 1025d 1071d 0/29 auto-obsoleted due to no activity on 2023/09/28 09:43
upstream KCSAN: data-race in fifo_open / wait_for_partner (4) fs 6 8 858d 918d 0/29 auto-obsoleted due to no activity on 2024/03/13 09:11
upstream KCSAN: data-race in fifo_open / wait_for_partner (2) fs 6 54 1109d 1507d 0/29 auto-obsoleted due to no activity on 2023/07/06 11:38
upstream KCSAN: data-race in fifo_open / wait_for_partner fs 6 66 1553d 2015d 0/29 auto-closed as invalid on 2022/04/18 09:31

Sample crash report:
==================================================================
BUG: KCSAN: data-race in fifo_open / wait_for_partner

read-write to 0xffff88810019bde4 of 4 bytes by task 9495 on cpu 0:
 fifo_open+0x89/0x5b0 fs/pipe.c:1132
 do_dentry_open+0x49f/0xa60 fs/open.c:947
 vfs_open+0x37/0x1e0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x1b51/0x2020 fs/namei.c:4858
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1381
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810019bde4 of 4 bytes by task 9490 on cpu 1:
 pipe_unlock fs/pipe.c:97 [inline]
 wait_for_partner+0xc9/0x1d0 fs/pipe.c:1106
 fifo_open+0x443/0x5b0 fs/pipe.c:1176
 do_dentry_open+0x49f/0xa60 fs/open.c:947
 vfs_open+0x37/0x1e0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x1b51/0x2020 fs/namei.c:4858
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 __do_sys_openat2 fs/open.c:1413 [inline]
 __se_sys_openat2+0x193/0x1f0 fs/open.c:1389
 __x64_sys_openat2+0x55/0x70 fs/open.c:1389
 x64_sys_call+0x2170/0x3020 arch/x86/include/generated/asm/syscalls_64.h:438
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 9490 Comm: syz.0.2132 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================

Crashes (291):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/13 07:55 upstream 062871f1371b 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/13 06:44 upstream 062871f1371b 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/12 17:11 upstream 1dadb7e7eb5a 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/11 02:16 upstream 9716c086c8e8 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/10 19:36 upstream acb7500801e9 f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/10 01:50 upstream 685441a6d3f1 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/09 11:45 upstream 2d3090a8aeb5 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/08 17:14 upstream 2d3090a8aeb5 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/07 17:44 upstream 33d8d8ec31b5 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/05 10:01 upstream ddd664bbff63 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/04 20:41 upstream 9154c4af7829 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/03 19:07 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/06/01 02:01 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/28 11:55 upstream eb3f4b7426cf 681715f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/27 23:39 upstream eb3f4b7426cf 4c36e7e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/26 21:31 upstream d60ec36cab33 2b01f00e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/26 17:44 upstream d60ec36cab33 a3e47276 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/26 09:02 upstream e8c2f9fdadee a3e47276 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/26 00:24 upstream e8c2f9fdadee c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/25 11:00 upstream e7ae89a0c97c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/24 03:14 upstream eed108edc117 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/22 06:23 upstream 6779b50faa56 70ae9b03 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/20 16:58 upstream df685633c3db 62fb93a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/19 01:20 upstream 4d3a2a466b8d 9f74d399 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/18 11:04 upstream 5200f5f493f7 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/18 01:14 upstream e5d505e3664b de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/16 19:42 upstream d458a240344c a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/15 07:44 upstream 70eda68668d1 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/14 14:38 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/13 09:58 upstream 1d5dcaa3bd65 fec2a7ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/12 23:13 upstream c21b90f77687 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/12 18:44 upstream c21b90f77687 07aeade5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/10 09:17 upstream 1bfaee9d3351 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/08 15:08 upstream 917719c412c4 b2988c17 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/08 00:07 upstream 8ab992f815d6 cbf9e0fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/05 23:35 upstream 9207d47f966b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/04 08:15 upstream 6d35786de281 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/02 22:04 upstream 66edb901bf87 a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/02 08:51 upstream f1a5e78a55eb a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/05/01 19:55 upstream 6fe0be6dc7fa 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/27 21:36 upstream 254f49634ee1 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/27 10:24 upstream 254f49634ee1 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/25 17:05 upstream 897d54018cc9 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/24 14:13 upstream dd6c438c3e64 1c2b9291 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/22 23:39 upstream 2a4c0c11c019 b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/21 05:27 upstream b4e07588e743 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/18 04:57 upstream 8541d8f725c6 5be7a9de .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/16 19:12 upstream 1d51b370a0f8 4743f87d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/15 15:14 upstream 1f5ffc672165 c441f497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/14 15:22 upstream d60bc1401583 362d1323 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/13 20:30 upstream 26ff969926a0 9530ccf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/12 02:12 upstream e753c16cb3dd 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/04/10 06:16 upstream 9a9c8ce300cd 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/03/06 04:44 upstream 5ee8dbf54602 31e9c887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/02/23 21:00 upstream 7dff99b35460 6beca497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2026/01/09 20:08 upstream 372800cb95a3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/07/15 11:20 upstream 155a3c003e55 03fcfc4b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
* Struck through repros no longer work on HEAD.