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KCSAN: data-race in d_delete / lookup_fast (2)

Status: auto-closed as invalid on 2020/12/21 11:52
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+f92850396011d2eb679f@syzkaller.appspotmail.com
First crash: 1977d, last: 1970d
▶ ▼ 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 721d 846d 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 1680d 1694d 0/29 auto-closed as invalid on 2021/09/28 20:03
upstream KCSAN: data-race in d_delete / lookup_fast (4) fs 6 12 1735d 1811d 0/29 auto-closed as invalid on 2021/08/05 10:35
upstream KCSAN: data-race in d_delete / lookup_fast (7) fs 6 141 14h12m 638d 0/29 moderation: reported on 2024/07/01 17:10
upstream KCSAN: data-race in d_delete / lookup_fast fs 6 33 2254d 2350d 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 1892d 1892d 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 0xffff88800901a480 of 4 bytes by task 14900 on cpu 1:
 d_delete+0x66/0xa0 fs/dcache.c:2469
 vfs_unlink+0x38f/0x3b0 fs/namei.c:3847
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3897
 __do_sys_unlink fs/namei.c:3943 [inline]
 __se_sys_unlink fs/namei.c:3941 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3941
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88800901a480 of 4 bytes by task 4894 on cpu 0:
 d_revalidate fs/namei.c:767 [inline]
 lookup_fast+0x15f/0x370 fs/namei.c:1493
 walk_component+0x5c/0x350 fs/namei.c:1857
 lookup_last fs/namei.c:2310 [inline]
 path_lookupat+0x11d/0x550 fs/namei.c:2334
 filename_lookup+0xf2/0x380 fs/namei.c:2367
 user_path_at_empty+0x3b/0x50 fs/namei.c:2647
 do_readlinkat+0x87/0x200 fs/stat.c:407
 __do_sys_readlink fs/stat.c:440 [inline]
 __se_sys_readlink fs/stat.c:437 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:437
 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: 4894 Comm: systemd-udevd Not tainted 5.10.0-rc2-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
2020/11/08 01:27 upstream 4429f14aeea9 cba33199 .config console log report info ci2-upstream-kcsan-gce
2020/11/01 14:10 upstream c2dc4c073fb7 8bc4594f .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.