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BUG: KCSAN: data-race in inotify_handle_event / inotify_remove_from_idr

write to 0xffff88812b7f3098 of 4 bytes by task 15314 on cpu 0:
 inotify_remove_from_idr+0xf8/0x310 fs/notify/inotify/inotify_user.c:473
 inotify_ignored_and_remove_idr+0x98/0xe0 fs/notify/inotify/inotify_user.c:498
 inotify_freeing_mark+0x23/0x30 fs/notify/inotify/inotify_fsnotify.c:141
 fsnotify_free_mark+0x9f/0xe0 fs/notify/mark.c:423
 fsnotify_destroy_mark+0x3c/0x50 fs/notify/mark.c:432
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:787 [inline]
 __se_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:762 [inline]
 __x64_sys_inotify_rm_watch+0xc4/0x120 fs/notify/inotify/inotify_user.c:762
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b7f3098 of 4 bytes by task 11768 on cpu 1:
 inotify_handle_event+0x239/0x3f4 fs/notify/inotify/inotify_fsnotify.c:121
 send_to_group fs/notify/fsnotify.c:227 [inline]
 fsnotify+0x575/0x830 fs/notify/fsnotify.c:366
 fsnotify_file include/linux/fsnotify.h:78 [inline]
 fsnotify_close include/linux/fsnotify.h:281 [inline]
 __fput+0x356/0x500 fs/file_table.c:266
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xba/0x120 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x38b/0x3b0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11768 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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