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BUG: KCSAN: data-race in fsnotify / fsnotify_detach_connector_from_object

write to 0xffff88812ab8c5ec of 4 bytes by task 25216 on cpu 0:
 fsnotify_detach_connector_from_object+0xa8/0x1f0 fs/notify/mark.c:184
 fsnotify_put_mark+0x340/0x420 fs/notify/mark.c:250
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:790 [inline]
 __se_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:762 [inline]
 __x64_sys_inotify_rm_watch+0xcf/0x120 fs/notify/inotify/inotify_user.c:762
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812ab8c5ec of 4 bytes by task 7772 on cpu 1:
 fsnotify+0x182/0x7d0 fs/notify/fsnotify.c:352
 fsnotify_path include/linux/fsnotify.h:54 [inline]
 fsnotify_close include/linux/fsnotify.h:290 [inline]
 __fput+0x38a/0x4f0 fs/file_table.c:266
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xf5/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7772 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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