syzbot

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BUG: KCSAN: data-race in inotify_handle_inode_event / inotify_remove_from_idr

write to 0xffff88811cd4c408 of 4 bytes by task 9898 on cpu 1:
 inotify_remove_from_idr+0x15c/0x310 fs/notify/inotify/inotify_user.c:511
 inotify_ignored_and_remove_idr+0x30/0x60 fs/notify/inotify/inotify_user.c:532
 inotify_freeing_mark+0x19/0x20 fs/notify/inotify/inotify_fsnotify.c:133
 fsnotify_free_mark fs/notify/mark.c:490 [inline]
 fsnotify_destroy_mark+0x1a8/0x1c0 fs/notify/mark.c:499
 __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 0xffff88811cd4c408 of 4 bytes by task 1844 on cpu 0:
 inotify_handle_inode_event+0x199/0x2e0 fs/notify/inotify/inotify_fsnotify.c:113
 fsnotify_handle_inode_event fs/notify/fsnotify.c:264 [inline]
 fsnotify_handle_event fs/notify/fsnotify.c:316 [inline]
 send_to_group fs/notify/fsnotify.c:364 [inline]
 fsnotify+0x138e/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+0x1d7/0x510 fs/file_table.c:306
 ____fput+0x11/0x20 fs/file_table.c:353
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000079c9 -> 0xffffffff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1844 Comm: syz-executor.2 Not tainted 6.0.0-rc6-syzkaller-00309-g1a61b828566f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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