syzbot

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BUG: KCSAN: data-race in dnotify_flush / pid_update_inode

read to 0xffff8881256b0588 of 2 bytes by task 14231 on cpu 0:
 dnotify_flush+0x3a/0x210 fs/notify/dnotify/dnotify.c:151
 filp_close+0xd5/0x120 fs/open.c:1177
 __close_fd+0xef/0x140 fs/file.c:636
 __do_sys_close fs/open.c:1193 [inline]
 __se_sys_close fs/open.c:1191 [inline]
 __x64_sys_close+0x49/0xb0 fs/open.c:1191
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881256b0588 of 2 bytes by task 14229 on cpu 1:
 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: 1 PID: 14229 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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