syzbot


KCSAN: data-race in __dentry_kill / d_set_d_op (9)

Status: auto-closed as invalid on 2022/03/12 00:21
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 301d, last: 301d
similar bugs (11):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (7) 2 536d 570d 0/24 auto-closed as invalid on 2021/07/19 11:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (3) 6 908d 949d 0/24 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (2) 9 1038d 1107d 0/24 auto-closed as invalid on 2020/04/08 20:57
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (5) 1 757d 725d 0/24 auto-closed as invalid on 2020/12/21 11:58
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (10) 5 200d 262d 0/24 auto-closed as invalid on 2022/06/20 15:46
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (4) 3 838d 856d 0/24 auto-closed as invalid on 2020/09/21 06:01
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (11) 1 160d 160d 0/24 auto-closed as invalid on 2022/07/30 10:14
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (6) 1 628d 628d 0/24 auto-closed as invalid on 2021/04/18 21:16
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (12) 3 65d 110d 0/24 auto-obsoleted due to no activity on 2022/11/02 16:09
upstream KCSAN: data-race in __dentry_kill / d_set_d_op (8) 13 340d 497d 0/24 auto-closed as invalid on 2022/02/01 06:29
upstream KCSAN: data-race in __dentry_kill / d_set_d_op 3 1118d 1125d 0/24 closed as invalid on 2019/11/19 14:14

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

write to 0xffff88812c77a240 of 4 bytes by task 11275 on cpu 1:
 d_set_d_op+0x17f/0x220 fs/dcache.c:1935
 simple_lookup+0x78/0x90 fs/libfs.c:74
 lookup_open fs/namei.c:3308 [inline]
 open_last_lookups fs/namei.c:3400 [inline]
 path_openat+0xb27/0x1f30 fs/namei.c:3606
 do_filp_open+0x105/0x220 fs/namei.c:3636
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1241
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812c77a240 of 4 bytes by task 8560 on cpu 0:
 dentry_unlist fs/dcache.c:572 [inline]
 __dentry_kill+0x1ef/0x450 fs/dcache.c:603
 dput+0x218/0x430 fs/dcache.c:913
 handle_mounts fs/namei.c:1552 [inline]
 step_into+0x468/0xf70 fs/namei.c:1850
 open_last_lookups fs/namei.c:3423 [inline]
 path_openat+0xfa5/0x1f30 fs/namei.c:3606
 do_filp_open+0x105/0x220 fs/namei.c:3636
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1241
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8560 Comm: syz-executor.3 Not tainted 5.17.0-rc2-syzkaller-00293-g86286e486cbd-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/02/05 00:20 upstream 86286e486cbd e13a05ed .config log report info KCSAN: data-race in __dentry_kill / d_set_d_op
* Struck through repros no longer work on HEAD.