syzbot

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BUG: KCSAN: data-race in unix_poll / unix_release_sock

write to 0xffff8881428b7960 of 4 bytes by task 5642 on cpu 1:
 unix_release_sock+0x3ff/0x780 net/unix/af_unix.c:633
 unix_release+0x52/0x70 net/unix/af_unix.c:1042
 __sock_release net/socket.c:653 [inline]
 sock_close+0x70/0x150 net/socket.c:1395
 __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+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 0xffff8881428b7960 of 4 bytes by task 5650 on cpu 0:
 unix_poll+0x71/0x250 net/unix/af_unix.c:3168
 sock_poll+0x253/0x270 net/socket.c:1383
 vfs_poll include/linux/poll.h:88 [inline]
 __io_arm_poll_handler+0x205/0xe30 io_uring/poll.c:600
 io_arm_poll_handler+0x48b/0x5e0 io_uring/poll.c:735
 io_queue_async+0x85/0x4a0 io_uring/io_uring.c:2057
 io_queue_sqe io_uring/io_uring.c:2088 [inline]
 io_req_task_submit+0x11c/0x130 io_uring/io_uring.c:1425
 handle_tw_list io_uring/io_uring.c:1184 [inline]
 tctx_task_work+0x1fe/0x4d0 io_uring/io_uring.c:1246
 task_work_run+0x123/0x160 kernel/task_work.c:179
 get_signal+0xe64/0xff0 kernel/signal.c:2635
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 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: 0x00000000 -> 0x00000068

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5650 Comm: syz-executor.3 Not tainted 6.3.0-rc5-syzkaller-00247-gcdc9718d5e59 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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