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BUG: KCSAN: data-race in __fsnotify_parent / vfs_rename

write to 0xffff888139156480 of 4 bytes by task 17750 on cpu 0:
 dont_mount include/linux/dcache.h:358 [inline]
 vfs_rename+0xe4a/0xfb0 fs/namei.c:4551
 do_renameat2+0x59e/0x9b0 fs/namei.c:4696
 __do_sys_rename fs/namei.c:4745 [inline]
 __se_sys_rename fs/namei.c:4743 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4743
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888139156480 of 4 bytes by task 17748 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_access include/linux/fsnotify.h:247 [inline]
 vfs_read+0x35f/0x5d0 fs/read_write.c:500
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17748 Comm: systemd-udevd Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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