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BUG: KCSAN: data-race in unix_poll / unix_shutdown

read-write to 0xffff8881292a1ca2 of 1 bytes by task 23260 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 0xffff8881292a1ca2 of 1 bytes by task 23246 on cpu 1:
 unix_poll+0x98/0x250 net/unix/af_unix.c:3127
 sock_poll+0x23e/0x260 net/socket.c:1353
 vfs_poll include/linux/poll.h:88 [inline]
 __io_arm_poll_handler+0x1b9/0x570 fs/io_uring.c:7125
 io_arm_poll_handler+0x370/0x430 fs/io_uring.c:7229
 io_queue_async+0x7b/0x160 fs/io_uring.c:8688
 io_queue_sqe fs/io_uring.c:8726 [inline]
 io_submit_sqe+0x3998/0x3eb0 fs/io_uring.c:8977
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9088
 __do_sys_io_uring_enter fs/io_uring.c:12035 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:11961
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11961
 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: 23246 Comm: syz-executor.4 Tainted: G        W         5.19.0-rc3-syzkaller-00279-g8c23f235a6a8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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