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BUG: KCSAN: data-race in fsnotify / fsnotify_put_mark

write to 0xffff88812983e94c of 4 bytes by task 23714 on cpu 1:
 fsnotify_detach_connector_from_object fs/notify/mark.c:184 [inline]
 fsnotify_put_mark+0x26c/0x5c0 fs/notify/mark.c:250
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:788 [inline]
 __se_sys_inotify_rm_watch+0xff/0x170 fs/notify/inotify/inotify_user.c:762
 __x64_sys_inotify_rm_watch+0x2d/0x40 fs/notify/inotify/inotify_user.c:762
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812983e94c of 4 bytes by task 5430 on cpu 0:
 fsnotify+0x157/0x9e0 fs/notify/fsnotify.c:346
 fsnotify_file include/linux/fsnotify.h:78 [inline]
 fsnotify_perm+0x1f6/0x250 include/linux/fsnotify.h:103
 security_file_open+0x85/0x90 security/security.c:1563
 do_dentry_open+0x27c/0x8e0 fs/open.c:815
 vfs_open+0x43/0x50 fs/open.c:942
 do_open fs/namei.c:3243 [inline]
 path_openat+0x185f/0x20e0 fs/namei.c:3360
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_open fs/open.c:1201 [inline]
 __se_sys_open fs/open.c:1199 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1199
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5430 Comm: syz-executor.3 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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