syzbot


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

Status: moderation: reported on 2025/07/15 11:21
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+4cec0207aa959dfb97a4@syzkaller.appspotmail.com
First crash: 143d, last: 34m
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 550d 614d 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 835d 880d 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 668d 727d 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 918d 1316d 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 1363d 1824d 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 0xffff88813f8f842c of 4 bytes by task 9746 on cpu 0:
 fifo_open+0x86/0x5d0 fs/pipe.c:1132
 do_dentry_open+0x54b/0xa60 fs/open.c:962
 vfs_open+0x37/0x1e0 fs/open.c:1094
 do_open fs/namei.c:4628 [inline]
 path_openat+0x1ddd/0x23b0 fs/namei.c:4787
 do_file_open_root+0x1d0/0x400 fs/namei.c:4839
 file_open_root+0xfd/0x130 fs/open.c:1411
 file_open_handle fs/fhandle.c:415 [inline]
 do_handle_open+0x630/0x710 fs/fhandle.c:428
 __do_sys_open_by_handle_at fs/fhandle.c:451 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:442 [inline]
 __x64_sys_open_by_handle_at+0x44/0x50 fs/fhandle.c:442
 x64_sys_call+0x2b6a/0x3000 arch/x86/include/generated/asm/syscalls_64.h:305
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88813f8f842c of 4 bytes by task 9769 on cpu 1:
 pipe_unlock fs/pipe.c:97 [inline]
 wait_for_partner+0xb5/0x1c0 fs/pipe.c:1106
 fifo_open+0x462/0x5d0 fs/pipe.c:1176
 do_dentry_open+0x54b/0xa60 fs/open.c:962
 vfs_open+0x37/0x1e0 fs/open.c:1094
 do_open fs/namei.c:4628 [inline]
 path_openat+0x1ddd/0x23b0 fs/namei.c:4787
 do_filp_open+0x109/0x230 fs/namei.c:4814
 do_sys_openat2+0xa6/0x150 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1447
 x64_sys_call+0x2b07/0x3000 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 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: 9769 Comm: syz.0.2028 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================

Crashes (126):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/06 10:27 upstream 416f99c3b16f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/12/05 07:42 upstream 2061f18ad76e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/12/04 18:25 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/12/02 16:46 upstream 4a26e7032d7d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/12/02 06:26 upstream 1d18101a644e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/12/01 07:39 upstream 7d0a66e4bb90 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/30 18:19 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/28 14:13 upstream e538109ac71d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/26 22:32 upstream 4941a17751c9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/26 14:14 upstream 30f09200cc4a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/26 06:35 upstream 30f09200cc4a 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/25 17:18 upstream 8a2bcda5e139 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/25 11:34 upstream ac3fd01e4c1e 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/24 21:58 upstream ac3fd01e4c1e bf6fe8fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/24 08:55 upstream d0e88704d96c 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/23 09:13 upstream d13f3ac64efb 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/22 20:00 upstream 89edd36fd801 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/21 21:40 upstream 2eba5e05d9bc 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/21 19:41 upstream fd95357fd8c6 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/20 11:00 upstream 23cb64fb7625 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/19 07:37 upstream 8b690556d8fe ef766cd7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/17 20:14 upstream e7c375b18160 ef766cd7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/17 06:13 upstream 6a23ae0a96a6 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/16 16:48 upstream 7254a2b52279 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/15 22:27 upstream f824272b6e3f f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/15 14:58 upstream 7a0892d2836e f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/14 20:35 upstream d4f8cccc6230 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/13 03:51 upstream e927c520e1ba 07e030de .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/11 22:28 upstream 24172e0d7990 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/10 19:35 upstream 4ea7c1717f3f 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/09 00:37 upstream 7bb4d6512545 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/08 11:17 upstream e811c33b1f13 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/07 18:14 upstream 4a0c9b339199 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/06 19:55 upstream c2c2ccfd4ba7 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/06 17:38 upstream dc77806cf3b4 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/06 10:26 upstream dc77806cf3b4 a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/05 21:00 upstream 1c353dc8d962 a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/05 07:23 upstream 17d85f33a83b a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/04 13:44 upstream c9cfc122f037 686bf657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/04 04:06 upstream 8bb886cb8f3a 686bf657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/03 21:34 upstream 6146a0f1dfae 686bf657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/02 21:21 upstream 6146a0f1dfae 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/11/01 19:50 upstream 691d401c7e0e 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/10/31 04:17 upstream d127176862a9 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/10/29 12:53 upstream e53642b87a4f fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fifo_open / wait_for_partner
2025/10/27 13:02 upstream dcb6fa37fd7b fd2207e7 .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.