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BUG: KCSAN: data-race in unix_release_sock / unix_seqpacket_sendmsg

write to 0xffff88807d47be30 of 4 bytes by task 29818 on cpu 1:
 unix_release_sock+0x2ad/0x650 net/unix/af_unix.c:550
 unix_release+0x2f/0x50 net/unix/af_unix.c:859
 __sock_release net/socket.c:596 [inline]
 sock_close+0x6c/0x150 net/socket.c:1277
 __fput+0x243/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88807d47be30 of 4 bytes by task 29835 on cpu 0:
 sock_error include/net/sock.h:2217 [inline]
 unix_seqpacket_sendmsg+0x36/0x100 net/unix/af_unix.c:2044
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0x75/0xa0 net/socket.c:671
 io_send fs/io_uring.c:4428 [inline]
 io_issue_sqe+0x1661/0x45e0 fs/io_uring.c:5958
 __io_queue_sqe+0x230/0x1160 fs/io_uring.c:6232
 io_queue_sqe+0x1e2/0x580 fs/io_uring.c:6298
 io_submit_sqe+0x385/0x8f0 fs/io_uring.c:6367
 io_submit_sqes+0x9a8/0x1720 fs/io_uring.c:6596
 __do_sys_io_uring_enter fs/io_uring.c:8983 [inline]
 __se_sys_io_uring_enter+0x52c/0xac0 fs/io_uring.c:8932
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8932
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29835 Comm: syz-executor.5 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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