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KCSAN: data-race in __dentry_kill / d_set_d_op (12)

Status: auto-obsoleted due to no activity on 2022/11/02 16:09
Subsystems: fs
[Documentation on labels]
First crash: 1065d, last: 1019d
▶ ▼ Similar bugs (19)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (9) fs 1 1255d 1255d 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 1 452d 452d 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 (7) fs 2 1490d 1524d 0/29 auto-closed as invalid on 2021/07/19 11:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (3) fs 6 1863d 1903d 0/29 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (2) fs 9 1992d 2061d 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 1 1711d 1679d 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 5 1154d 1216d 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 13 663d 723d 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 1 759d 759d 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 3 1792d 1811d 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 1 1114d 1114d 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 1 1582d 1582d 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 561d 582d 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 (20) fs 3 21d 96d 0/29 moderation: reported on 2025/04/09 04:25
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (8) fs 13 1294d 1451d 0/29 auto-closed as invalid on 2022/02/01 06:29
upstream KCSAN: data-race in __dentry_kill / d_set_d_op fs 3 2072d 2079d 0/29 closed as invalid on 2019/11/19 14:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (18) fs 4 339d 382d 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 4 870d 929d 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 1 219d 219d 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

read-write to 0xffff88813aa2fcc0 of 4 bytes by task 2146 on cpu 0:
 d_set_d_op+0x14c/0x1e0 fs/dcache.c:1936
 simple_lookup+0x78/0x90 fs/libfs.c:74
 lookup_open fs/namei.c:3391 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0xb1c/0x1b00 fs/namei.c:3688
 do_filp_open+0x105/0x220 fs/namei.c:3718
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_openat fs/open.c:1345 [inline]
 __se_sys_openat fs/open.c:1340 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813aa2fcc0 of 4 bytes by task 1917 on cpu 1:
 dentry_unlist fs/dcache.c:572 [inline]
 __dentry_kill+0x1e7/0x450 fs/dcache.c:603
 dentry_kill+0x8d/0x1e0
 dput+0x11e/0x1f0 fs/dcache.c:913
 handle_mounts fs/namei.c:1548 [inline]
 step_into+0x1fd/0x7d0 fs/namei.c:1831
 open_last_lookups fs/namei.c:3504 [inline]
 path_openat+0xf6f/0x1b00 fs/namei.c:3688
 do_filp_open+0x105/0x220 fs/namei.c:3718
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_openat fs/open.c:1345 [inline]
 __se_sys_openat fs/open.c:1340 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1917 Comm: udevd Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/09/28 16:04 upstream 46452d3786a8 75c78242 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2022/09/03 17:42 upstream d895ec7938c4 28811d0a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __dentry_kill / d_set_d_op
2022/08/14 07:34 upstream 7ebfc85e2cd7 8dfcaa3d .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.