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BUG: KCSAN: data-race in __fsnotify_parent / fsnotify_recalc_mask

write to 0xffff888101c9a85c of 4 bytes by task 3198 on cpu 1:
 __fsnotify_recalc_mask fs/notify/mark.c:132 [inline]
 fsnotify_recalc_mask+0x17d/0x200 fs/notify/mark.c:147
 fsnotify_add_mark_locked+0xa57/0xc70 fs/notify/mark.c:694
 fsnotify_add_inode_mark_locked include/linux/fsnotify_backend.h:548 [inline]
 inotify_new_watch fs/notify/inotify/inotify_user.c:601 [inline]
 inotify_update_watch fs/notify/inotify/inotify_user.c:628 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:766 [inline]
 __se_sys_inotify_add_watch+0x548/0x680 fs/notify/inotify/inotify_user.c:709
 __x64_sys_inotify_add_watch+0x3f/0x50 fs/notify/inotify/inotify_user.c:709
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101c9a85c of 4 bytes by task 501 on cpu 0:
 fsnotify_event_needs_parent fs/notify/fsnotify.c:163 [inline]
 __fsnotify_parent+0x12e/0x440 fs/notify/fsnotify.c:204
 fsnotify_parent include/linux/fsnotify.h:77 [inline]
 fsnotify_file include/linux/fsnotify.h:99 [inline]
 fsnotify_open include/linux/fsnotify.h:277 [inline]
 do_sys_openat2+0x23a/0x2b0 fs/open.c:1205
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x0000a008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 501 Comm: syz-executor.2 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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