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BUG: KCSAN: data-race in sock_alloc_send_pskb / unix_shutdown

read-write to 0xffff88812a72a8a2 of 1 bytes by task 9865 on cpu 0:
 unix_shutdown+0x6d/0x380 net/unix/af_unix.c:2968
 __sys_shutdown_sock net/socket.c:2331 [inline]
 __sys_shutdown net/socket.c:2343 [inline]
 __do_sys_shutdown net/socket.c:2351 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2349
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2349
 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+0x46/0xb0

read to 0xffff88812a72a8a2 of 1 bytes by task 9864 on cpu 1:
 sock_alloc_send_pskb+0x113/0x4f0 net/core/sock.c:2647
 unix_stream_sendmsg+0x3a5/0xaa0 net/unix/af_unix.c:2151
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0x75/0xa0 net/socket.c:734
 io_send fs/io_uring.c:6192 [inline]
 io_issue_sqe+0x34eb/0xaa00 fs/io_uring.c:8348
 io_queue_sqe fs/io_uring.c:8709 [inline]
 io_submit_sqe+0x2e0f/0x3f30 fs/io_uring.c:8973
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9084
 __do_sys_io_uring_enter fs/io_uring.c:12031 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:11957
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11957
 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+0x46/0xb0

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9864 Comm: syz-executor.2 Tainted: G        W         5.19.0-rc3-syzkaller-00048-gde5c208d533a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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