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KCSAN: data-race in d_alloc_parallel / d_set_d_op (4)

Status: auto-closed as invalid on 2021/03/08 01:09
Subsystems: fs
[Documentation on labels]
First crash: 1873d, last: 1873d
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op fs 6 23 2170d 2334d 0/29 auto-closed as invalid on 2020/06/18 13:33
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (9) fs 6 29 573d 777d 0/29 auto-obsoleted due to no activity on 2024/09/27 23:53
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (7) fs 6 4 1366d 1422d 0/29 auto-closed as invalid on 2022/07/28 05:03
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (2) fs 6 1 2033d 2033d 0/29 auto-closed as invalid on 2020/09/29 03:57
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (10) fs 6 2 509d 531d 0/29 auto-obsoleted due to no activity on 2024/12/22 11:11
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (8) fs 6 43 815d 832d 0/29 auto-obsoleted due to no activity on 2024/01/30 06:40
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (12) fs 6 2 336d 388d 0/29 auto-obsoleted due to no activity on 2025/06/13 19:10
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (6) fs 6 3 1459d 1505d 0/29 auto-closed as invalid on 2022/04/26 06:41
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (3) fs 6 2 1937d 1929d 0/29 auto-closed as invalid on 2021/01/03 18:19
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (11) fs 6 1 449d 449d 0/29 auto-obsoleted due to no activity on 2025/02/20 09:31
upstream KCSAN: data-race in d_alloc_parallel / d_set_d_op (5) fs 6 13 1743d 1832d 0/29 auto-closed as invalid on 2021/07/16 11:19

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

write to 0xffff88812e14d180 of 4 bytes by task 4871 on cpu 1:
 d_set_d_op+0x17f/0x220 fs/dcache.c:1882
 simple_lookup+0x78/0x90 fs/libfs.c:73
 lookup_open fs/namei.c:3085 [inline]
 open_last_lookups fs/namei.c:3180 [inline]
 path_openat+0xa72/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812e14d180 of 4 bytes by task 21475 on cpu 0:
 d_in_lookup include/linux/dcache.h:363 [inline]
 d_wait_lookup fs/dcache.c:2528 [inline]
 d_alloc_parallel+0x625/0xd10 fs/dcache.c:2616
 lookup_open fs/namei.c:3033 [inline]
 open_last_lookups fs/namei.c:3180 [inline]
 path_openat+0x650/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21475 Comm: systemd-udevd Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/01 01:00 upstream 6642d600b541 fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in d_alloc_parallel / d_set_d_op
* Struck through repros no longer work on HEAD.