KCSAN: data-race in pid_update_inode / vfs

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BUG: KCSAN: data-race in pid_update_inode / vfs_read

read to 0xffff88812524e828 of 2 bytes by task 7637 on cpu 1:
 fsnotify_access include/linux/fsnotify.h:236 [inline]
 vfs_read fs/read_write.c:463 [inline]
 vfs_read+0x1ad/0x2c0 fs/read_write.c:446
 ksys_read+0xd5/0x1b0 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x4c/0x60 fs/read_write.c:595
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812524e828 of 2 bytes by task 7632 on cpu 0:
 pid_update_inode+0x51/0x70 fs/proc/base.c:1820
 pid_revalidate+0x91/0x120 fs/proc/base.c:1841
 d_revalidate fs/namei.c:758 [inline]
 d_revalidate fs/namei.c:755 [inline]
 lookup_fast+0x612/0x6c0 fs/namei.c:1618
 do_last fs/namei.c:3291 [inline]
 path_openat+0x2ac/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7632 Comm: ps Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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Crashes (11):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2020/01/18 22:00	https://github.com/google/ktsan.git kcsan	245a43005292	bc8bc756	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/16 10:56	https://github.com/google/ktsan.git kcsan	245a43005292	f9b69507	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/09 15:07	https://github.com/google/ktsan.git kcsan	245a43005292	4de4e9f0	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/06 01:19	https://github.com/google/ktsan.git kcsan	245a43005292	438e1227	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/03 23:23	https://github.com/google/ktsan.git kcsan	245a43005292	68256974	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/03 15:45	https://github.com/google/ktsan.git kcsan	245a43005292	9dcc1191	.config	console log	report	ci2-upstream-kcsan-gce
2019/12/30 19:41	https://github.com/google/ktsan.git kcsan	245a43005292	6b36d338	.config	console log	report	ci2-upstream-kcsan-gce
2019/12/02 18:03	https://github.com/google/ktsan.git kcsan	ef798c30ba4e	ab342da3	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/17 09:29	https://github.com/google/ktsan.git kcsan	5863cc791e4c	d5696d51	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/15 06:44	https://github.com/google/ktsan.git kcsan	5863cc791e4c	79248ee8	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/12 08:51	https://github.com/google/ktsan.git kcsan	7f2955e0d056	048f2d49	.config	console log	report	ci2-upstream-kcsan-gce

Crashes (11):

Time

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