KCSAN: data-race in __fsnotify_parent / vfs

KCSAN: data-race in __fsnotify_parent / vfs_rename
Status: moderation: reported on 2020/12/07 11:39
Reported-by: syzbot+7accc0b9c3e3b924a735@syzkaller.appspotmail.com
First crash: 213d, last: 22h16m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __fsnotify_parent / vfs_rename

write to 0xffff888131b1a780 of 4 bytes by task 11899 on cpu 0:
 dont_mount include/linux/dcache.h:357 [inline]
 vfs_rename+0xcac/0xe00 fs/namei.c:4564
 do_renameat2+0x59e/0x9b0 fs/namei.c:4709
 __do_sys_rename fs/namei.c:4758 [inline]
 __se_sys_rename fs/namei.c:4756 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4756
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888131b1a780 of 4 bytes by task 11879 on cpu 1:
 __fsnotify_parent+0x7d/0x430 fs/notify/fsnotify.c:187
 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:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11879 Comm: systemd-udevd Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (22):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/20 10:46	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/04/19 09:55	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/04/14 18:32	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/04/14 00:47	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/04/07 02:23	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/03/17 10:12	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/03/10 07:19	upstream	05a59d79	26967e35	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/02/23 12:28	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/01/27 18:56	upstream	2ab38c17	a57db36f	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/01/24 11:15	upstream	e1ae4b0b	52e37319	.config	log	report	info	KCSAN: data-race in __fsnotify_parent / vfs_rename
ci2-upstream-kcsan-gce	2021/01/13 04:14	upstream	e609571b	0cdd6185	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 00:15	upstream	a0d54b4f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/11 02:26	upstream	9fca90cf	f900b48c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/03 14:57	upstream	34816d20	59ad4022	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 00:05	upstream	b6505459	c42a35e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 09:36	upstream	af5043c8	16fca0c8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 17:18	upstream	659caaf6	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 01:39	upstream	f804b315	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/14 22:37	upstream	b5fc7a89	fc7735a2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/01 22:30	upstream	fcadab74	9602ddf4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/22 19:29	upstream	eff48dde	3e8f6c27	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 15:37	upstream	eb5f95f1	53ce8104	.config	log	report	info