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KCSAN: data-race in __dentry_kill / d_set_d_op (7)

Status: auto-closed as invalid on 2021/07/19 11:09
Subsystems: fs
[Documentation on labels]
First crash: 1707d, last: 1673d
▶ ▼ Similar bugs (19)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (9) fs 6 1 1438d 1438d 0/29 auto-closed as invalid on 2022/03/12 00:21
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (17) fs 6 1 635d 635d 0/29 auto-obsoleted due to no activity on 2024/05/23 05:15
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (3) fs 6 6 2045d 2086d 0/29 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (2) fs 6 9 2175d 2244d 0/29 auto-closed as invalid on 2020/04/08 20:57
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (5) fs 6 1 1894d 1862d 0/29 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (10) fs 6 5 1337d 1399d 0/29 auto-closed as invalid on 2022/06/20 15:46
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (15) fs 6 13 846d 906d 0/29 auto-obsoleted due to no activity on 2023/10/24 14:04
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (14) fs 6 1 942d 942d 0/29 auto-obsoleted due to no activity on 2023/07/21 00:16
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (4) fs 6 3 1974d 1993d 0/29 auto-closed as invalid on 2020/09/21 06:01
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (11) fs 6 1 1297d 1297d 0/29 auto-closed as invalid on 2022/07/30 10:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (6) fs 6 1 1765d 1765d 0/29 auto-closed as invalid on 2021/04/18 21:16
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (16) fs 6 6 743d 765d 0/29 auto-obsoleted due to no activity on 2024/02/04 06:56
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (12) fs 6 3 1202d 1247d 0/29 auto-obsoleted due to no activity on 2022/11/02 16:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (20) fs 6 3 204d 279d 0/29 auto-obsoleted due to no activity on 2025/08/18 00:28
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (8) fs 6 13 1476d 1634d 0/29 auto-closed as invalid on 2022/02/01 06:29
upstream KCSAN: data-race in __dentry_kill / d_set_d_op fs 6 3 2255d 2262d 0/29 closed as invalid on 2019/11/19 14:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (18) fs 6 4 522d 564d 0/29 auto-obsoleted due to no activity on 2024/09/13 03:18
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (13) fs 6 4 1053d 1112d 0/29 auto-obsoleted due to no activity on 2023/04/04 19:35
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (19) fs 6 1 402d 402d 0/29 auto-obsoleted due to no activity on 2025/02/01 04:42

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

write to 0xffff888106668480 of 4 bytes by task 7335 on cpu 0:
 d_set_d_op+0x17f/0x220 fs/dcache.c:1910
 simple_lookup+0x78/0x90 fs/libfs.c:74
 lookup_open fs/namei.c:3193 [inline]
 open_last_lookups fs/namei.c:3285 [inline]
 path_openat+0xb5a/0x20b0 fs/namei.c:3491
 do_filp_open+0xd9/0x1f0 fs/namei.c:3521
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1207
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888106668480 of 4 bytes by task 7310 on cpu 1:
 dentry_unlist fs/dcache.c:547 [inline]
 __dentry_kill+0x1ef/0x4e0 fs/dcache.c:578
 dentry_kill fs/dcache.c:695 [inline]
 dput+0xc6/0x360 fs/dcache.c:888
 handle_mounts fs/namei.c:1474 [inline]
 step_into+0x442/0xec0 fs/namei.c:1772
 open_last_lookups fs/namei.c:3308 [inline]
 path_openat+0xfc8/0x20b0 fs/namei.c:3491
 do_filp_open+0xd9/0x1f0 fs/namei.c:3521
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1207
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7310 Comm: systemd-udevd Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/06/14 11:05 upstream 009c9aa5be65 1ba81399 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2021/05/12 03:56 upstream 88b06399c9c7 b3c3bb8e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
* Struck through repros no longer work on HEAD.