syzbot

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BUG: KCSAN: data-race in fsnotify / fsnotify_detach_mark

write to 0xffff888101976544 of 4 bytes by task 4884 on cpu 1:
 fsnotify_detach_mark+0xdd/0x180 fs/notify/mark.c:455
 fsnotify_destroy_mark+0xae/0x1c0 fs/notify/mark.c:497
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:817 [inline]
 __se_sys_inotify_rm_watch+0xf7/0x170 fs/notify/inotify/inotify_user.c:794
 __x64_sys_inotify_rm_watch+0x2d/0x40 fs/notify/inotify/inotify_user.c:794
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888101976544 of 4 bytes by task 7681 on cpu 0:
 fsnotify_handle_inode_event fs/notify/fsnotify.c:256 [inline]
 fsnotify_handle_event fs/notify/fsnotify.c:316 [inline]
 send_to_group fs/notify/fsnotify.c:364 [inline]
 fsnotify+0x12f8/0x1550 fs/notify/fsnotify.c:570
 __fsnotify_parent+0x30b/0x470 fs/notify/fsnotify.c:230
 fsnotify_parent include/linux/fsnotify.h:77 [inline]
 fsnotify_file include/linux/fsnotify.h:99 [inline]
 fsnotify_close include/linux/fsnotify.h:341 [inline]
 __fput+0x4b0/0x570 fs/file_table.c:306
 ____fput+0x11/0x20 fs/file_table.c:348
 task_work_run+0xde/0x110 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000003 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7681 Comm: syz-executor.5 Not tainted 6.2.0-rc5-syzkaller-00013-g2475bf0250de-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.