syzbot

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BUG: KCSAN: data-race in fsnotify_detach_mark / fsnotify_handle_inode_event

write to 0xffff8881033cfae4 of 4 bytes by task 3289 on cpu 1:
 fsnotify_detach_mark+0xba/0x160 fs/notify/mark.c:547
 fsnotify_clear_marks_by_group+0x30c/0x4d0 fs/notify/mark.c:913
 fsnotify_destroy_group+0x55/0x190 fs/notify/group.c:61
 inotify_release+0x1f/0x30 fs/notify/inotify/inotify_user.c:308
 __fput+0x2ac/0x640 fs/file_table.c:448
 ____fput+0x1c/0x30 fs/file_table.c:476
 task_work_run+0x13a/0x1a0 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x5d8/0x17f0 kernel/exit.c:938
 do_group_exit+0x102/0x150 kernel/exit.c:1087
 get_signal+0xeb9/0x1000 kernel/signal.c:3036
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881033cfae4 of 4 bytes by task 3298 on cpu 0:
 fsnotify_handle_inode_event+0x126/0x220 fs/notify/fsnotify.c:308
 fsnotify_handle_event fs/notify/fsnotify.c:371 [inline]
 send_to_group fs/notify/fsnotify.c:419 [inline]
 fsnotify+0x1187/0x1260 fs/notify/fsnotify.c:628
 __fsnotify_parent+0x2f5/0x340 fs/notify/fsnotify.c:282
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_path include/linux/fsnotify.h:113 [inline]
 fsnotify_file include/linux/fsnotify.h:127 [inline]
 fsnotify_close include/linux/fsnotify.h:456 [inline]
 __fput+0x1e7/0x640 fs/file_table.c:434
 __fput_sync+0x96/0xc0 fs/file_table.c:534
 __do_sys_close fs/open.c:1579 [inline]
 __se_sys_close fs/open.c:1564 [inline]
 __x64_sys_close+0x55/0xe0 fs/open.c:1564
 x64_sys_call+0x266c/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:4
 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: 0x00000003 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3298 Comm: syz-executor Not tainted 6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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