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KCSAN: data-race in dput / vfs_rename (5)

Status: auto-closed as invalid on 2021/04/14 19:39
Subsystems: fs
[Documentation on labels]
First crash: 1850d, last: 1792d
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in dput / vfs_rename (4) fs 6 1 1944d 1944d 0/29 auto-closed as invalid on 2020/11/13 11:07
upstream KCSAN: data-race in dput / vfs_rename (3) fs 6 2 2035d 2055d 0/29 auto-closed as invalid on 2020/08/14 12:58
upstream KCSAN: data-race in dput / vfs_rename (2) fs 6 1 2149d 2149d 0/29 auto-closed as invalid on 2020/05/27 13:23
upstream KCSAN: data-race in dput / vfs_rename fs 6 1 2257d 2257d 0/29 auto-closed as invalid on 2020/02/09 03:47

Sample crash report:
==================================================================
BUG: KCSAN: data-race in dput / vfs_rename

write to 0xffff88800cd61cc0 of 4 bytes by task 10321 on cpu 0:
 dont_mount include/linux/dcache.h:357 [inline]
 vfs_rename+0xcb1/0xde0 fs/namei.c:4562
 do_renameat2+0x658/0x990 fs/namei.c:4707
 __do_sys_rename fs/namei.c:4756 [inline]
 __se_sys_rename fs/namei.c:4754 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4754
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88800cd61cc0 of 4 bytes by task 10344 on cpu 1:
 fast_dput fs/dcache.c:747 [inline]
 dput+0x34/0x430 fs/dcache.c:873
 path_put fs/namei.c:546 [inline]
 terminate_walk+0x109/0x270 fs/namei.c:643
 path_openat+0x18dc/0x21b0 fs/namei.c:3499
 do_filp_open+0xbd/0x1d0 fs/namei.c:3525
 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10344 Comm: systemd-udevd Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/03/10 19:33 upstream 05a59d79793d 764067f3 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_rename
2021/02/13 23:05 upstream ac30d8ce28d6 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_rename
2021/01/27 12:46 upstream 2ab38c17aac1 a0ebf917 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_rename
2021/01/23 10:24 upstream fe75a21824e7 52e37319 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_rename
2021/01/10 19:55 upstream 2ff90100ace8 2c1f2513 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.