KCSAN: data-race in iput / writeback_sb

KCSAN: data-race in iput / writeback_sb_inodes (5)
Status: auto-closed as invalid on 2021/03/04 09:19
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 205d, last: 181d

similar bugs (5):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in iput / writeback_sb_inodes (2)	1	405d	405d	0/22	closed as invalid on 2020/06/18 14:13
upstream	KCSAN: data-race in iput / writeback_sb_inodes (3)	1	386d	386d	0/22	auto-closed as invalid on 2020/08/11 19:26
upstream	KCSAN: data-race in iput / writeback_sb_inodes (6)	2	43d	50d	0/22	auto-closed as invalid on 2021/07/20 06:50
upstream	KCSAN: data-race in iput / writeback_sb_inodes	1	506d	506d	0/22	auto-closed as invalid on 2020/05/18 05:32
upstream	KCSAN: data-race in iput / writeback_sb_inodes (4)	7	269d	233d	0/22	auto-closed as invalid on 2020/12/21 11:42

Sample crash report:

==================================================================
BUG: KCSAN: data-race in iput / writeback_sb_inodes

write to 0xffff888009a7c1d8 of 8 bytes by task 370 on cpu 1:
 writeback_sb_inodes+0x494/0x1020 fs/fs-writeback.c:1712
 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1896
 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2041
 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2082
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x64a/0xaa0 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff888009a7c1d8 of 8 bytes by task 8458 on cpu 0:
 iput+0x2e/0x510 fs/inode.c:1669
 dentry_unlink_inode+0x1f3/0x210 fs/dcache.c:374
 d_delete+0x70/0xa0 fs/dcache.c:2477
 vfs_unlink+0x38f/0x3b0 fs/namei.c:3849
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3899
 __do_sys_unlink fs/namei.c:3945 [inline]
 __se_sys_unlink fs/namei.c:3943 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943
 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: 8458 Comm: syz-executor.4 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/01/28 09:14	upstream	76c057c84d28	eefc07f2	.config	log	report	info	KCSAN: data-race in iput / writeback_sb_inodes
ci2-upstream-kcsan-gce	2021/01/19 05:51	upstream	1e2a199f6ccd	63631df1	.config	log	report	info	KCSAN: data-race in iput / writeback_sb_inodes
ci2-upstream-kcsan-gce	2021/01/04 22:34	upstream	36bbbd0e234d	2a28ff1f	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 20:03	upstream	36bbbd0e234d	79264ae3	.config	log	report	info