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BUG: KCSAN: data-race in skb_dequeue / unix_dgram_peer_wake_me

write to 0xffff88811a3024e0 of 4 bytes by task 3051 on cpu 0:
 __skb_unlink include/linux/skbuff.h:2022 [inline]
 __skb_dequeue include/linux/skbuff.h:2042 [inline]
 skb_dequeue+0x84/0x150 net/core/skbuff.c:3040
 unix_release_sock+0x2bb/0x660 net/unix/af_unix.c:557
 unix_release+0x3e/0x70 net/unix/af_unix.c:842
 __sock_release+0x85/0x160 net/socket.c:592
 sock_close+0x24/0x30 net/socket.c:1270
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811a3024e0 of 4 bytes by task 3056 on cpu 1:
 unix_recvq_full net/unix/af_unix.c:194 [inline]
 unix_dgram_peer_wake_me+0x1c5/0x240 net/unix/af_unix.c:435
 unix_dgram_poll+0x3de/0x410 net/unix/af_unix.c:2681
 sock_poll+0xed/0x250 net/socket.c:1258
 vfs_poll include/linux/poll.h:90 [inline]
 ep_item_poll.isra.0+0x90/0x190 fs/eventpoll.c:871
 ep_send_events_proc+0x113/0x590 fs/eventpoll.c:1728
 ep_scan_ready_list.constprop.0+0x189/0x410 fs/eventpoll.c:698
 ep_send_events fs/eventpoll.c:1772 [inline]
 ep_poll+0xe3/0x900 fs/eventpoll.c:1909
 do_epoll_wait+0x162/0x180 fs/eventpoll.c:2273
 __do_sys_epoll_wait fs/eventpoll.c:2283 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2280 [inline]
 __x64_sys_epoll_wait+0x5e/0x80 fs/eventpoll.c:2280
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3056 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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