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BUG: KCSAN: data-race in sock_alloc_send_pskb / unix_shutdown

read-write to 0xffff88816c523d6c of 1 bytes by task 885 on cpu 1:
 unix_shutdown+0x72/0x360 net/unix/af_unix.c:3011
 __sys_shutdown_sock net/socket.c:2343 [inline]
 __sys_shutdown net/socket.c:2355 [inline]
 __do_sys_shutdown net/socket.c:2363 [inline]
 __se_sys_shutdown+0xf8/0x140 net/socket.c:2361
 __x64_sys_shutdown+0x31/0x40 net/socket.c:2361
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88816c523d6c of 1 bytes by task 877 on cpu 0:
 sock_alloc_send_pskb+0x117/0x4e0 net/core/sock.c:2719
 unix_stream_sendmsg+0x35e/0xa90 net/unix/af_unix.c:2213
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0x79/0xd0 net/socket.c:747
 io_send+0x255/0x8f0 io_uring/net.c:393
 io_issue_sqe+0x147/0x660 io_uring/io_uring.c:1907
 io_queue_sqe io_uring/io_uring.c:2079 [inline]
 io_submit_sqe io_uring/io_uring.c:2340 [inline]
 io_submit_sqes+0x689/0xfe0 io_uring/io_uring.c:2450
 __do_sys_io_uring_enter io_uring/io_uring.c:3458 [inline]
 __se_sys_io_uring_enter+0x1e5/0x1b70 io_uring/io_uring.c:3392
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3392
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 877 Comm: syz-executor.1 Not tainted 6.3.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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