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BUG: KCSAN: data-race in __fsnotify_parent / vfs_unlink

write to 0xffff88810d9fd0c0 of 4 bytes by task 18496 on cpu 1:
 dont_mount include/linux/dcache.h:357 [inline]
 vfs_unlink+0x289/0x3e0 fs/namei.c:4031
 do_unlinkat+0x29f/0x4f0 fs/namei.c:4096
 __do_sys_unlink fs/namei.c:4143 [inline]
 __se_sys_unlink fs/namei.c:4141 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4141
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810d9fd0c0 of 4 bytes by task 18493 on cpu 0:
 __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_modify include/linux/fsnotify.h:255 [inline]
 vfs_write+0x43c/0x7e0 fs/read_write.c:609
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18493 Comm: syz-executor.3 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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