syzbot


KCSAN: data-race in iput / writeback_sb_inodes (11)

Status: auto-obsoleted due to no activity on 2024/04/09 08:02
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+89dd4fb9e93bd7bd586b@syzkaller.appspotmail.com
First crash: 105d, last: 105d
Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in iput / writeback_sb_inodes (2) fs 1 1461d 1461d 0/27 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in iput / writeback_sb_inodes (3) fs 1 1441d 1441d 0/27 auto-closed as invalid on 2020/08/11 19:26
upstream KCSAN: data-race in iput / writeback_sb_inodes (7) fs 1 1027d 1027d 0/27 auto-closed as invalid on 2021/09/29 17:35
upstream KCSAN: data-race in iput / writeback_sb_inodes (6) fs 2 1099d 1106d 0/27 auto-closed as invalid on 2021/07/20 06:50
upstream KCSAN: data-race in iput / writeback_sb_inodes (8) fs 1 802d 802d 0/27 auto-closed as invalid on 2022/05/13 10:29
upstream KCSAN: data-race in iput / writeback_sb_inodes fs 1 1562d 1562d 0/27 auto-closed as invalid on 2020/05/18 05:32
upstream KCSAN: data-race in iput / writeback_sb_inodes (5) fs 4 1237d 1260d 0/27 auto-closed as invalid on 2021/03/04 09:19
upstream KCSAN: data-race in iput / writeback_sb_inodes (4) fs 7 1324d 1289d 0/27 auto-closed as invalid on 2020/12/21 11:42
upstream KCSAN: data-race in iput / writeback_sb_inodes (9) fs 2 684d 698d 0/27 auto-closed as invalid on 2022/09/08 05:08
upstream KCSAN: data-race in iput / writeback_sb_inodes (10) fs 1 418d 418d 0/27 auto-obsoleted due to no activity on 2023/05/31 14:58

Sample crash report:
==================================================================
BUG: KCSAN: data-race in iput / writeback_sb_inodes

write to 0xffff8881066e41c0 of 8 bytes by task 17323 on cpu 0:
 writeback_sb_inodes+0x2da/0xad0 fs/fs-writeback.c:1905
 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2092
 wb_do_writeback fs/fs-writeback.c:2239 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243

read to 0xffff8881066e41c0 of 8 bytes by task 20474 on cpu 1:
 iput+0x32/0x5c0 fs/inode.c:1755
 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:400
 d_delete+0x76/0xf0 fs/dcache.c:2389
 d_delete_notify include/linux/fsnotify.h:299 [inline]
 vfs_rmdir+0x1a0/0x2f0 fs/namei.c:4222
 do_rmdir+0x194/0x320 fs/namei.c:4268
 __do_sys_unlinkat fs/namei.c:4444 [inline]
 __se_sys_unlinkat fs/namei.c:4438 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4438
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000020001 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20474 Comm: syz-executor.4 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/05 08:01 upstream 90d35da658da 5fc53669 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in iput / writeback_sb_inodes
* Struck through repros no longer work on HEAD.