syzbot


KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (8)

Status: auto-closed as invalid on 2022/08/07 13:58
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 166d, last: 157d
similar bugs (9):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (5) 1 360d 360d 0/24 auto-closed as invalid on 2022/01/16 16:04
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes 38 913d 1133d 0/24 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (3) 2 473d 475d 0/24 auto-closed as invalid on 2021/09/25 11:37
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (7) 2 202d 234d 0/24 auto-closed as invalid on 2022/06/23 15:49
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (2) 70 540d 765d 0/24 auto-closed as invalid on 2021/07/20 20:13
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (4) 2 412d 434d 0/24 auto-closed as invalid on 2021/11/25 03:42
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (10) 1 60d 60d 0/24 auto-obsoleted due to no activity on 2022/11/12 17:32
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (9) 1 119d 119d 0/24 auto-closed as invalid on 2022/09/14 22:08
upstream KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes (6) 1 289d 289d 0/24 auto-closed as invalid on 2022/03/28 07:47

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

write to 0xffff88811b77d300 of 8 bytes by task 13724 on cpu 0:
 writeback_sb_inodes+0x494/0xdd0 fs/fs-writeback.c:1854
 __writeback_inodes_wb+0xb0/0x2a0 fs/fs-writeback.c:1936
 wb_writeback+0x280/0x650 fs/fs-writeback.c:2041
 wb_check_background_flush fs/fs-writeback.c:2107 [inline]
 wb_do_writeback+0x5b3/0x600 fs/fs-writeback.c:2195
 wb_workfn+0x88/0x260 fs/fs-writeback.c:2222
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff88811b77d300 of 8 bytes by task 1828 on cpu 1:
 __mark_inode_dirty+0xd5/0x620 fs/fs-writeback.c:2402
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x1c4/0x2e0 fs/inode.c:1941
 file_accessed include/linux/fs.h:2386 [inline]
 iterate_dir+0x343/0x390 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x80/0x190 fs/readdir.c:354
 __x64_sys_getdents64+0x3f/0x50 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1828 Comm: syz-executor.5 Not tainted 5.19.0-rc4-syzkaller-00208-g69cb6c6556ad-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/07/03 13:52 upstream 69cb6c6556ad 1434eec0 .config log report info KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes
ci2-upstream-kcsan-gce 2022/06/24 17:30 upstream 92f20ff72066 a371c43c .config log report info KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes
* Struck through repros no longer work on HEAD.