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BUG: KCSAN: data-race in unix_shutdown / unix_stream_sendmsg

read-write to 0xffff888103b1e462 of 1 bytes by task 12426 on cpu 0:
 unix_shutdown+0x6d/0x380 net/unix/af_unix.c:2997
 __sys_shutdown_sock net/socket.c:2324 [inline]
 __sys_shutdown net/socket.c:2336 [inline]
 __do_sys_shutdown net/socket.c:2344 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2342
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2342
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888103b1e462 of 1 bytes by task 12424 on cpu 1:
 unix_stream_sendmsg+0x226/0xaa0 net/unix/af_unix.c:2183
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0x75/0xa0 net/socket.c:734
 io_send+0x27d/0x9d0 io_uring/net.c:377
 io_issue_sqe+0x30f/0x850 io_uring/io_uring.c:1743
 io_queue_sqe io_uring/io_uring.c:1916 [inline]
 io_submit_sqe+0x3b1/0xa40 io_uring/io_uring.c:2174
 io_submit_sqes+0x274/0x530 io_uring/io_uring.c:2285
 __do_sys_io_uring_enter io_uring/io_uring.c:3220 [inline]
 __se_sys_io_uring_enter+0x1ef/0xc00 io_uring/io_uring.c:3152
 __x64_sys_io_uring_enter+0x74/0x80 io_uring/io_uring.c:3152
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12424 Comm: syz-executor.5 Tainted: G        W          6.1.0-rc6-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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