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BUG: KCSAN: data-race in unix_dgram_poll / unix_release_sock

write to 0xffff88814afe8e30 of 4 bytes by task 21090 on cpu 1:
 unix_release_sock+0x310/0x6f0 net/unix/af_unix.c:559
 unix_release+0x2f/0x50 net/unix/af_unix.c:867
 __sock_release net/socket.c:647 [inline]
 sock_close+0x6c/0x150 net/socket.c:1293
 __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 0xffff88814afe8e30 of 4 bytes by task 21101 on cpu 0:
 unix_dgram_poll+0x6e/0x3e0 net/unix/af_unix.c:2698
 sock_poll+0x23e/0x260 net/socket.c:1281
 vfs_poll include/linux/poll.h:90 [inline]
 __io_arm_poll_handler+0x195/0x460 fs/io_uring.c:5109
 io_arm_poll_handler+0x2e8/0x6f0 fs/io_uring.c:5179
 __io_queue_sqe+0x135/0x360 fs/io_uring.c:6440
 io_queue_sqe fs/io_uring.c:6464 [inline]
 io_submit_sqe+0x1695/0x3400 fs/io_uring.c:6619
 io_submit_sqes+0x822/0xe50 fs/io_uring.c:6735
 __do_sys_io_uring_enter fs/io_uring.c:9340 [inline]
 __se_sys_io_uring_enter+0x1c7/0xa10 fs/io_uring.c:9283
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9283
 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: 0x00000000 -> 0x00000068

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21101 Comm: syz-executor.2 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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