syzbot

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BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async

write to 0xffff88810a817c58 of 8 bytes by task 15626 on cpu 0:
 fasync_remove_entry+0xd5/0x130 fs/fcntl.c:878
 fasync_helper+0x96/0xc0 fs/fcntl.c:977
 sock_fasync+0x60/0xd0 net/socket.c:1418
 __fput+0x532/0x570 fs/file_table.c:318
 ____fput+0x15/0x20 fs/file_table.c:349
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810a817c58 of 8 bytes by task 15623 on cpu 1:
 sock_wake_async+0x2a/0x120 net/socket.c:1433
 sk_wake_async include/net/sock.h:2518 [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:651 [inline]
 sock_close+0x70/0x150 net/socket.c:1393
 __fput+0x245/0x570 fs/file_table.c:321
 ____fput+0x15/0x20 fs/file_table.c:349
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888104e3f9f0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15623 Comm: syz-executor.0 Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
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