syzbot

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BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync

write to 0xffff888109cb2358 of 8 bytes by task 14061 on cpu 1:
 fasync_remove_entry+0xd5/0x130 fs/fcntl.c:878
 fasync_helper+0x96/0xc0 fs/fcntl.c:977
 sock_fasync+0x60/0xd0 net/socket.c:1423
 __fput+0x5b2/0x600 fs/file_table.c:375
 ____fput+0x15/0x20 fs/file_table.c:406
 task_work_run+0x135/0x1a0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888109cb2358 of 8 bytes by task 14073 on cpu 0:
 kill_fasync+0x24/0x150 fs/fcntl.c:1016
 sock_wake_async+0xf5/0x120
 sk_wake_async include/net/sock.h:2530 [inline]
 unix_release_sock+0x483/0x780 net/unix/af_unix.c:636
 unix_release+0x52/0x70 net/unix/af_unix.c:1042
 __sock_release net/socket.c:654 [inline]
 sock_close+0x70/0x150 net/socket.c:1398
 __fput+0x303/0x600 fs/file_table.c:378
 ____fput+0x15/0x20 fs/file_table.c:406
 task_work_run+0x135/0x1a0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff88812d36e210 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14073 Comm: syz-executor.2 Not tainted 6.4.0-syzkaller-01371-g04fc8904d5d1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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