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BUG: KCSAN: data-race in dnotify_flush / pid_update_inode

write to 0xffff8881244e75a8 of 2 bytes by task 7503 on cpu 1:
 pid_update_inode+0x51/0x70 fs/proc/base.c:1820
 pid_revalidate+0x91/0xd0 fs/proc/base.c:1841
 d_revalidate fs/namei.c:765 [inline]
 d_revalidate fs/namei.c:762 [inline]
 lookup_fast+0x685/0x7e0 fs/namei.c:1618
 do_last fs/namei.c:3282 [inline]
 path_openat+0x2ac/0x3530 fs/namei.c:3533
 do_filp_open+0x11e/0x1b0 fs/namei.c:3563
 do_sys_open+0x3b3/0x4f0 fs/open.c:1089
 __do_sys_open fs/open.c:1107 [inline]
 __se_sys_open fs/open.c:1102 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1102
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881244e75a8 of 2 bytes by task 7494 on cpu 0:
 dnotify_flush+0x3a/0x210 fs/notify/dnotify/dnotify.c:150
 filp_close+0xd5/0x120 fs/open.c:1169
 __close_fd+0xef/0x140 fs/file.c:636
 __do_sys_close fs/open.c:1185 [inline]
 __se_sys_close fs/open.c:1183 [inline]
 __x64_sys_close+0x49/0xb0 fs/open.c:1183
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7494 Comm: ps Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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