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BUG: KCSAN: data-race in __fsnotify_parent / __fsnotify_recalc_mask

write to 0xffff888101438e68 of 4 bytes by task 3713 on cpu 0:
 __fsnotify_recalc_mask+0x216/0x320 fs/notify/mark.c:248
 fsnotify_recalc_mask+0xaa/0x190 fs/notify/mark.c:286
 fsnotify_add_mark_locked+0x6e0/0x840 fs/notify/mark.c:807
 fsnotify_add_inode_mark_locked include/linux/fsnotify_backend.h:814 [inline]
 inotify_new_watch fs/notify/inotify/inotify_user.c:620 [inline]
 inotify_update_watch fs/notify/inotify/inotify_user.c:647 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:786 [inline]
 __se_sys_inotify_add_watch+0x66c/0x800 fs/notify/inotify/inotify_user.c:729
 __x64_sys_inotify_add_watch+0x43/0x50 fs/notify/inotify/inotify_user.c:729
 x64_sys_call+0x2acb/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:255
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101438e68 of 4 bytes by task 3262 on cpu 1:
 fsnotify_object_watched fs/notify/fsnotify.c:198 [inline]
 __fsnotify_parent+0xd4/0x380 fs/notify/fsnotify.c:228
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_file include/linux/fsnotify.h:131 [inline]
 fsnotify_open include/linux/fsnotify.h:401 [inline]
 vfs_open+0x1be/0x1f0 fs/open.c:1096
 do_open fs/namei.c:3727 [inline]
 path_openat+0x1a26/0x1f10 fs/namei.c:3886
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00002008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3262 Comm: syz-executor Not tainted 6.11.0-rc7-syzkaller-00093-gfdf042df0463 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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