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BUG: KCSAN: data-race in unix_dgram_poll / unix_shutdown

write to 0xffff888128269a70 of 1 bytes by task 20571 on cpu 1:
 unix_shutdown+0x78/0x3f0 net/unix/af_unix.c:2847
 __sys_shutdown_sock net/socket.c:2248 [inline]
 __sys_shutdown net/socket.c:2260 [inline]
 __do_sys_shutdown net/socket.c:2268 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2266
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2266
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888128269a70 of 1 bytes by task 20557 on cpu 0:
 unix_dgram_poll+0xdf/0x3e0 net/unix/af_unix.c:3048
 sock_poll+0x23e/0x260 net/socket.c:1302
 vfs_poll include/linux/poll.h:90 [inline]
 __io_arm_poll_handler+0x1af/0x5c0 fs/io_uring.c:5509
 io_arm_poll_handler+0x34d/0x700 fs/io_uring.c:5584
 __io_queue_sqe+0xa7/0x460 fs/io_uring.c:6925
 io_queue_sqe fs/io_uring.c:6953 [inline]
 io_submit_sqe+0x88b/0x3e80 fs/io_uring.c:7129
 io_submit_sqes+0x505/0xde0 fs/io_uring.c:7235
 __do_sys_io_uring_enter fs/io_uring.c:9877 [inline]
 __se_sys_io_uring_enter+0x20d/0xb30 fs/io_uring.c:9819
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9819
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20557 Comm: syz-executor.4 Tainted: G        W         5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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