syzbot


KCSAN: data-race in d_delete / lookup_fast (7)

Status: moderation: reported on 2024/07/01 17:10
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+70c2f73d091a888a745b@syzkaller.appspotmail.com
First crash: 412d, last: 1d14h
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in d_delete / lookup_fast (6) fs 6 288 495d 620d 0/29 auto-obsoleted due to no activity on 2024/05/14 15:32
upstream KCSAN: data-race in d_delete / lookup_fast (5) fs 6 3 1454d 1468d 0/29 auto-closed as invalid on 2021/09/28 20:03
upstream KCSAN: data-race in d_delete / lookup_fast (2) fs 6 2 1744d 1715d 0/29 auto-closed as invalid on 2020/12/21 11:52
upstream KCSAN: data-race in d_delete / lookup_fast (4) fs 6 12 1509d 1585d 0/29 auto-closed as invalid on 2021/08/05 10:35
upstream KCSAN: data-race in d_delete / lookup_fast fs 6 33 2028d 2125d 0/29 auto-closed as invalid on 2020/04/08 11:57
upstream KCSAN: data-race in d_delete / lookup_fast (3) fs 6 1 1667d 1667d 0/29 auto-closed as invalid on 2021/02/28 15:17

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

read-write to 0xffff888106d48e40 of 4 bytes by task 3292 on cpu 0:
 d_delete+0x15a/0x180 fs/dcache.c:2474
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:375
 vfs_unlink+0x30b/0x420 fs/namei.c:4601
 do_unlinkat+0x24e/0x480 fs/namei.c:4650
 __do_sys_unlink fs/namei.c:4696 [inline]
 __se_sys_unlink fs/namei.c:4694 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4694
 x64_sys_call+0x2dc0/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106d48e40 of 4 bytes by task 2990 on cpu 1:
 d_revalidate fs/namei.c:928 [inline]
 lookup_fast+0xf0/0x320 fs/namei.c:1756
 walk_component+0x3f/0x220 fs/namei.c:2125
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2654
 filename_lookup+0x147/0x340 fs/namei.c:2683
 do_readlinkat+0x7d/0x320 fs/stat.c:576
 __do_sys_readlink fs/stat.c:613 [inline]
 __se_sys_readlink fs/stat.c:610 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:610
 x64_sys_call+0x28da/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300180 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2990 Comm: udevd Not tainted 6.17.0-rc1-syzkaller-00211-g90d970cade8e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
==================================================================
Alternate GPT is invalid, using primary GPT.
 loop2: p2 p3 p7

Crashes (77):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/17 00:49 upstream 90d970cade8e 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/08/12 16:55 upstream 53e760d89498 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/08/07 19:05 upstream 6e64f4580381 04cffc22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/08/03 05:56 upstream 186f3edfdd41 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/07/29 22:07 upstream 0919a5b3b11c f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/07/27 12:15 upstream ec2df4364666 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/07/25 19:38 upstream 2942242dde89 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/07/16 11:25 upstream 155a3c003e55 124ec9cc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/07/12 23:41 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/27 10:00 upstream f02769e7f272 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/16 19:31 upstream e04c78d86a96 d1716036 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/13 03:21 upstream 27605c8c0f69 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/10 01:56 upstream 19272b37aa4f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/04 15:32 upstream 5abc7438f1e9 e565f08d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/06/02 10:21 upstream cd2e103d57e5 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/05/29 05:20 upstream 3d413f0cfd7e 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/05/12 00:07 upstream cd802e7e5f1e 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/05/03 05:32 upstream 2bfcee565c3a b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/04/26 18:30 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/04/11 10:08 upstream 900241a5cc15 94486846 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/04/10 22:26 upstream 2eb959eeecc6 1ef3ab4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/03/18 03:27 upstream fc444ada1310 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/03/15 20:15 upstream 3571e8b091f4 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/03/12 07:28 upstream 0b46b049d6ec ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/03/10 20:49 upstream 80e54e84911a 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/02/24 20:17 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/02/18 05:36 upstream 2408a807bfc3 429ea007 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/02/13 01:22 upstream 4dc1d1bec898 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/02/09 20:39 upstream 69b54314c975 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/30 02:28 upstream ebbb8be421ee afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/24 16:10 upstream 113691ce9f32 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/23 19:32 upstream d0d106a2bd21 521b0ce3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/22 07:59 upstream c4b9570cfb63 da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/19 00:39 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/12 02:24 upstream b62cef9a5c67 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/11 14:25 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2025/01/08 12:01 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/26 14:46 upstream 9b2ffa6148b1 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/24 21:54 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/24 01:37 upstream f07044dd0df0 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/23 03:14 upstream bcde95ce32b6 b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/22 16:19 upstream 48f506ad0b68 b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/19 13:19 upstream eabcdba3ad40 1432fc84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/17 00:58 upstream f44d154d6e3d eec85da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/12 13:46 upstream 231825b2e1ff 6f1b0fa8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/10 01:40 upstream 7cb1b4663150 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/12/04 00:23 upstream ceb8bf2ceaa7 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/30 20:35 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/27 14:57 upstream aaf20f870da0 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/19 00:15 upstream 23acd177540d 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/12 04:39 upstream 2d5404caa8c7 75bb1b32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/10 18:18 upstream a9cda7c0ffed 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/05 20:49 upstream 2e1b3cc9d7f7 da38b4c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/11/01 05:19 upstream 5635f189425e 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/10/29 02:16 upstream 819837584309 9efb3cc7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/10/18 00:17 upstream 6efbea77b390 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/10/10 07:38 upstream d3d1556696c1 0278d004 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/09/29 08:40 upstream 3efc57369a0c ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/09/21 17:49 upstream 7856a565416e 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/09/10 05:10 upstream bc83b4d1f086 784df80e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/09/07 19:23 upstream d1f2d51b711a 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/09/04 23:58 upstream c7fb1692dc01 dfbe2ed4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/28 09:36 upstream 86987d84b968 6c853ff9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/22 20:23 upstream 872cf28b8df9 ca02180f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/11 09:53 upstream 5189dafa4cf9 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/08 03:45 upstream 6a0e38264012 de12cf65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/02 06:30 upstream 183d46ff422e 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/08/01 00:41 upstream 21b136cc63d2 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/31 14:51 upstream e4fc196f5ba3 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/30 20:08 upstream 22f546873149 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/28 12:21 upstream 5437f30d3458 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/19 08:24 upstream 720261cfc732 ee4e11c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/17 17:40 upstream 51835949dda3 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/13 15:25 upstream 528dd46d0fc3 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/04 08:47 upstream 795c58e4c7fc 3f2748a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/03 19:21 upstream 8a9c6c40432e f76a75f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
2024/07/01 17:09 upstream 22a40d14b572 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in d_delete / lookup_fast
* Struck through repros no longer work on HEAD.