syzbot


KCSAN: data-race in pollwake / pollwake (5)

Status: moderation: reported on 2024/06/24 22:58
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+4c7af974f816af4ede2a@syzkaller.appspotmail.com
First crash: 276d, last: 10h17m
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in pollwake / pollwake (2) fs 2 1894d 1936d 0/28 auto-closed as invalid on 2020/03/29 13:20
upstream KCSAN: data-race in pollwake / pollwake (4) ext4 200 354d 476d 0/28 auto-obsoleted due to no activity on 2024/05/12 07:09
upstream KCSAN: data-race in pollwake / pollwake (3) fs 4 1603d 1571d 0/28 auto-closed as invalid on 2020/12/21 11:54
upstream KCSAN: data-race in pollwake / pollwake fs 1 1981d 1981d 0/28 closed as invalid on 2019/11/19 13:44

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

write to 0xffffc900014bf9d0 of 4 bytes by task 3675 on cpu 0:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xc1/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 anon_pipe_write+0x9df/0xb10 fs/pipe.c:595
 io_write+0x527/0xc90 io_uring/rw.c:1103
 __io_issue_sqe io_uring/io_uring.c:1737 [inline]
 io_issue_sqe+0x15f/0xb40 io_uring/io_uring.c:1756
 io_queue_sqe io_uring/io_uring.c:1975 [inline]
 io_submit_sqe io_uring/io_uring.c:2231 [inline]
 io_submit_sqes+0x67f/0x1050 io_uring/io_uring.c:2348
 __do_sys_io_uring_enter io_uring/io_uring.c:3400 [inline]
 __se_sys_io_uring_enter+0x1dc/0x1b50 io_uring/io_uring.c:3334
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3334
 x64_sys_call+0x26cb/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffffc900014bf9d0 of 4 bytes by task 3687 on cpu 1:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xc1/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 anon_pipe_write+0x9df/0xb10 fs/pipe.c:595
 io_write+0x527/0xc90 io_uring/rw.c:1103
 __io_issue_sqe io_uring/io_uring.c:1737 [inline]
 io_issue_sqe+0x15f/0xb40 io_uring/io_uring.c:1756
 io_queue_sqe io_uring/io_uring.c:1975 [inline]
 io_submit_sqe io_uring/io_uring.c:2231 [inline]
 io_submit_sqes+0x67f/0x1050 io_uring/io_uring.c:2348
 __do_sys_io_uring_enter io_uring/io_uring.c:3400 [inline]
 __se_sys_io_uring_enter+0x1dc/0x1b50 io_uring/io_uring.c:3334
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3334
 x64_sys_call+0x26cb/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3687 Comm: syz.7.11257 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================

Crashes (354):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/27 20:18 upstream 1a9239bb4253 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/27 07:26 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/26 17:26 upstream 2df0c02dab82 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/25 19:53 upstream 2df0c02dab82 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/25 04:46 upstream 3ba7dfb8da62 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/24 18:05 upstream 38fec10eb60d 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/24 06:41 upstream 586de92313fc 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/23 07:21 upstream 183601b78a9b 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/23 01:29 upstream 183601b78a9b c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/22 10:43 upstream 88d324e69ea9 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/20 16:24 upstream a7f2e10ecd8f 9209bc22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/19 21:33 upstream a7f2e10ecd8f e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/18 14:53 upstream 76b6905c11fd 22a6c2b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/18 12:18 upstream fc444ada1310 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/18 01:30 upstream 4701f33a1070 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/17 06:19 upstream 4701f33a1070 948c34e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/15 21:53 upstream 3571e8b091f4 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/15 03:16 upstream a29967be967e e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/14 13:51 upstream 695caca9345a e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/14 00:02 upstream 4003c9e78778 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/13 08:53 upstream b7f94fcf5546 44be8b44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/12 19:47 upstream 0fed89a961ea 1a5d9317 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/12 13:33 upstream 0fed89a961ea ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/11 12:15 upstream 4d872d51bc9d 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/10 04:19 upstream 80e54e84911a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/09 21:20 upstream 1110ce6a1e34 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/09 06:03 upstream b7c90e3e717a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/08 23:18 upstream 2a520073e74f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/08 03:38 upstream 21e4543a2e2f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/07 13:59 upstream 00a7d39898c8 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/06 15:36 upstream 848e07631744 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/05 22:11 upstream bb2281fb05e5 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/05 18:32 upstream bb2281fb05e5 60f5d8d9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/05 16:39 upstream 48a5eed9ad58 60f5d8d9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/04 18:44 upstream 99fa936e8e4f c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/03 11:50 upstream 7eb172143d55 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/02 19:19 upstream b91872c56940 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/02 06:42 upstream ece144f151ac c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/01 16:42 upstream 03d38806a902 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/03/01 14:32 upstream 7a5668899f54 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/02/28 04:02 upstream 1e15510b71c9 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/02/27 13:45 upstream dd83757f6e68 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/02/27 00:49 upstream 5394eea10651 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/02/26 07:13 upstream ac9c34d1e45a d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2025/02/25 18:06 upstream 2a1944bff549 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
2024/06/24 22:57 upstream 626737a5791b 215eef4a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in pollwake / pollwake
* Struck through repros no longer work on HEAD.