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BUG: KCSAN: data-race in __fsnotify_parent / vfs_rename

read-write to 0xffff88805fb249c0 of 4 bytes by task 4129 on cpu 1:
 dont_mount include/linux/dcache.h:354 [inline]
 vfs_rename+0xcd9/0xe20 fs/namei.c:4320
 do_renameat2+0x56c/0x930 fs/namei.c:4457
 __do_sys_rename fs/namei.c:4503 [inline]
 __se_sys_rename fs/namei.c:4501 [inline]
 __x64_sys_rename+0x3a/0x40 fs/namei.c:4501
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88805fb249c0 of 4 bytes by task 4894 on cpu 0:
 __fsnotify_parent+0x83/0x460 fs/notify/fsnotify.c:180
 fsnotify_parent include/linux/fsnotify.h:68 [inline]
 fsnotify_file include/linux/fsnotify.h:90 [inline]
 fsnotify_close include/linux/fsnotify.h:279 [inline]
 __fput+0x184/0x4d0 fs/file_table.c:267
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4894 Comm: systemd-udevd Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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