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BUG: KCSAN: data-race in sock_alloc_send_pskb / unix_release_sock

write to 0xffff888137dfe270 of 1 bytes by task 18689 on cpu 0:
 unix_release_sock+0x2bf/0x6f0 net/unix/af_unix.c:557
 unix_release+0x2f/0x50 net/unix/af_unix.c:867
 __sock_release net/socket.c:648 [inline]
 sock_close+0x6c/0x150 net/socket.c:1300
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888137dfe270 of 1 bytes by task 18807 on cpu 1:
 sock_alloc_send_pskb+0x113/0x4e0 net/core/sock.c:2446
 unix_dgram_sendmsg+0x478/0x1600 net/unix/af_unix.c:1676
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2060
 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:4363 [inline]
 io_issue_sqe+0x236e/0x6870 fs/io_uring.c:6155
 __io_queue_sqe+0xe7/0x360 fs/io_uring.c:6423
 io_queue_sqe fs/io_uring.c:6466 [inline]
 io_submit_sqe+0x1695/0x3400 fs/io_uring.c:6621
 io_submit_sqes+0x822/0xe50 fs/io_uring.c:6737
 __io_sq_thread fs/io_uring.c:6803 [inline]
 io_sq_thread+0x5e5/0xba0 fs/io_uring.c:6870
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18807 Comm: iou-sqp-18804 Tainted: G        W         5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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