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BUG: KCSAN: data-race in sock_alloc_send_pskb / unix_shutdown

write to 0xffff88810962e270 of 1 bytes by task 27357 on cpu 1:
 unix_shutdown+0x1dd/0x3b0 net/unix/af_unix.c:2584
 __sys_shutdown_sock net/socket.c:2231 [inline]
 __sys_shutdown net/socket.c:2243 [inline]
 __do_sys_shutdown net/socket.c:2251 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2249
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2249
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810962e270 of 1 bytes by task 27356 on cpu 0:
 sock_alloc_send_pskb+0x113/0x4e0 net/core/sock.c:2446
 unix_dgram_sendmsg+0x478/0x1600 net/unix/af_unix.c:1723
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2107
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg net/socket.c:723 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2392
 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2458
 io_sendmsg fs/io_uring.c:4403 [inline]
 io_issue_sqe+0x206d/0x64b0 fs/io_uring.c:6200
 __io_queue_sqe+0xe7/0x360 fs/io_uring.c:6468
 io_queue_sqe fs/io_uring.c:6511 [inline]
 io_submit_sqe+0x1695/0x3400 fs/io_uring.c:6666
 io_submit_sqes+0x822/0xe50 fs/io_uring.c:6782
 __do_sys_io_uring_enter fs/io_uring.c:9389 [inline]
 __se_sys_io_uring_enter+0x20c/0xb20 fs/io_uring.c:9332
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27356 Comm: syz-executor.2 Tainted: G        W         5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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