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: 400d, last: 4h58m

Sample crash report:

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

write to 0xffff888101b127cc of 4 bytes by task 12732 on cpu 0:
 fsnotify_detach_connector_from_object fs/notify/mark.c:184 [inline]
 fsnotify_put_mark+0x270/0x680 fs/notify/mark.c:250
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:794 [inline]
 __se_sys_inotify_rm_watch+0x126/0x1a0 fs/notify/inotify/inotify_user.c:768
 __x64_sys_inotify_rm_watch+0x2d/0x40 fs/notify/inotify/inotify_user.c:768
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101b127cc of 4 bytes by task 1041 on cpu 1:
 fsnotify+0x181/0x1190 fs/notify/fsnotify.c:505
 __fsnotify_parent+0x2f3/0x430 fs/notify/fsnotify.c:232
 fsnotify_parent include/linux/fsnotify.h:68 [inline]
 fsnotify_file include/linux/fsnotify.h:90 [inline]
 fsnotify_close include/linux/fsnotify.h:279 [inline]
 __fput+0x1a9/0x4e0 fs/file_table.c:266
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000a008 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1041 Comm: systemd-udevd Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (341):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/07/24 05:41	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/23 19:59	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/23 00:11	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/22 13:18	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/21 22:03	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/20 17:51	upstream	8cae8cd89f05	1b201b48	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/20 04:44	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/19 13:02	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/19 02:39	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/18 02:16	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/17 15:31	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/17 06:32	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/16 17:51	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/15 23:51	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/15 19:05	upstream	8096acd7442e	f115ae98	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/15 05:32	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/14 15:58	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/14 06:21	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/13 15:56	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/13 07:57	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/12 07:52	upstream	e73f0f0ee754	a4869c92	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/11 23:00	upstream	98f7fdced2e0	8f5a7b8c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/10 14:03	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/09 11:28	upstream	3dbdb38e2869	281e815f	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/08 23:57	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/08 14:31	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/08 02:38	upstream	3dbdb38e2869	95793bce	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/07 10:48	upstream	3dbdb38e2869	4846d5c1	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/07 01:06	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/06 08:20	upstream	3dbdb38e2869	6c4484eb	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/02 20:24	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/02 13:31	upstream	3dbdb38e2869	658ebc66	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/02 00:39	upstream	e058a84bfddc	658ebc66	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/01 10:40	upstream	dbe69e433722	658ebc66	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/07/01 03:27	upstream	df04fbe8680b	38a885d1	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/30 11:40	upstream	007b350a5875	84fd4c77	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/29 23:07	upstream	c54b245d0118	a4fccb01	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/29 16:55	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/29 10:30	upstream	122fa8c58831	9d2ab5df	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/28 13:55	upstream	62fb9874f5da	9d2ab5df	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/28 06:44	upstream	b4b27b9eed8e	9d2ab5df	.config	log	report	info	KCSAN: data-race in fsnotify / fsnotify_put_mark
ci2-upstream-kcsan-gce	2021/06/27 03:48	upstream	625acffd7ae2	9d2ab5df	.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