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BUG: KCSAN: data-race in inotify_handle_inode_event / inotify_remove_from_idr

write to 0xffff8881009c9d68 of 4 bytes by task 22292 on cpu 1:
 inotify_remove_from_idr+0x153/0x360 fs/notify/inotify/inotify_user.c:483
 inotify_ignored_and_remove_idr+0x30/0x60 fs/notify/inotify/inotify_user.c:504
 inotify_freeing_mark+0x19/0x20 fs/notify/inotify/inotify_fsnotify.c:133
 fsnotify_free_mark+0xcb/0xf0 fs/notify/mark.c:425
 fsnotify_destroy_mark+0x32/0x40 fs/notify/mark.c:434
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:791 [inline]
 __se_sys_inotify_rm_watch+0x11e/0x1a0 fs/notify/inotify/inotify_user.c:768
 __x64_sys_inotify_rm_watch+0x2d/0x40 fs/notify/inotify/inotify_user.c:768
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881009c9d68 of 4 bytes by task 1779 on cpu 0:
 inotify_handle_inode_event+0x194/0x2d0 fs/notify/inotify/inotify_fsnotify.c:113
 fsnotify_handle_inode_event fs/notify/fsnotify.c:263 [inline]
 fsnotify_handle_event fs/notify/fsnotify.c:310 [inline]
 send_to_group fs/notify/fsnotify.c:364 [inline]
 fsnotify+0x1040/0x1190 fs/notify/fsnotify.c:541
 __fsnotify_parent+0x2f3/0x430 fs/notify/fsnotify.c:232
 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+0x1a9/0x4e0 fs/file_table.c:266
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00001c18 -> 0xffffffff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1779 Comm: syz-executor.1 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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