KCSAN: data-race in fsnotify / fsnotify_put

KCSAN: data-race in fsnotify / fsnotify_put_mark
Status: moderation: reported on 2020/08/12 16:37
Reported-by: syzbot+68fa3855e60a3d51a81d@syzkaller.appspotmail.com
First crash: 537d, last: 1h45m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in fsnotify / fsnotify_put_mark

write to 0xffff888101e3758c of 4 bytes by task 2001 on cpu 0:
 fsnotify_detach_connector_from_object fs/notify/mark.c:215 [inline]
 fsnotify_put_mark+0x26e/0x6b0 fs/notify/mark.c:274
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:799 [inline]
 __se_sys_inotify_rm_watch+0xff/0x170 fs/notify/inotify/inotify_user.c:773
 __x64_sys_inotify_rm_watch+0x2d/0x40 fs/notify/inotify/inotify_user.c:773
 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 0xffff888101e3758c of 4 bytes by task 1437 on cpu 1:
 fsnotify+0x1e2/0xf00 fs/notify/fsnotify.c:507
 __fsnotify_parent+0x33a/0x490 fs/notify/fsnotify.c:232
 fsnotify_parent include/linux/fsnotify.h:77 [inline]
 fsnotify_file include/linux/fsnotify.h:99 [inline]
 fsnotify_open include/linux/fsnotify.h:290 [inline]
 do_sys_openat2+0x23a/0x2b0 fs/open.c:1217
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_openat fs/open.c:1244 [inline]
 __se_sys_openat fs/open.c:1239 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1239
 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: 0x00002008 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1437 Comm: udevd Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (560):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/12/08 11:50	upstream	2a987e65025e	a4a2a501	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/08 05:18	upstream	2a987e65025e	0230ba3e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/07 11:57	upstream	cd8c917a56f2	0230ba3e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/07 06:31	upstream	f80ef9e49fdf	0230ba3e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/06 10:14	upstream	0fcfb00b28c0	579a8754	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/05 23:43	upstream	944207047ca4	a617004c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/05 11:03	upstream	79a72162048e	a617004c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/04 18:01	upstream	bbef3c7a63d2	a617004c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/04 01:21	upstream	12119cfa1052	a617004c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/03 15:44	upstream	5f58da2befa5	c7c20675	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/02 23:00	upstream	a51e3ac43ddb	61f86278	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/01 21:12	upstream	58e1100fdc59	61f86278	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/01 18:06	upstream	58e1100fdc59	5fa3eacc	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/12/01 02:27	upstream	f080815fdb3e	80270552	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/30 11:33	upstream	d58071a8a76d	80270552	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/29 17:41	upstream	d58071a8a76d	d0830353	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/29 05:15	upstream	d06c942efea4	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/28 15:53	upstream	3498e7f2bb41	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/28 00:57	upstream	741392771338	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/27 01:02	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/26 09:16	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/26 03:32	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/25 02:34	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/24 03:30	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/22 19:59	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/21 22:34	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/21 09:29	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/20 23:40	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/20 05:56	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/19 16:21	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/18 22:16	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/17 18:07	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/16 23:14	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/16 18:44	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/15 16:51	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/15 00:45	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/14 08:56	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/14 03:56	upstream	a9b9669d9822	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/13 06:34	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/12 20:31	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/12 06:07	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/11 12:26	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/10 18:18	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/10 15:13	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/10 07:29	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/09 19:35	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/09 00:14	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/08 21:10	upstream	e851dfae4371	d29682f1	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/08 14:31	upstream	6b75d88fa81b	d29682f1	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/11/08 01:56	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/01/15 16:00	upstream	146620506274	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/12 04:43	upstream	bb5baaa9238e	bb3e5fe6	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 14:52	upstream	1b5044021070	3ea11d3f	.config	log	report