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BUG: KCSAN: data-race in skb_dequeue / unix_dgram_peer_wake_me

read to 0xffff8880ae6e84e0 of 4 bytes by task 18091 on cpu 0:
 unix_recvq_full net/unix/af_unix.c:194 [inline]
 unix_dgram_peer_wake_me+0x1c5/0x240 net/unix/af_unix.c:437
 unix_dgram_poll+0x3de/0x410 net/unix/af_unix.c:2664
 sock_poll+0xed/0x250 net/socket.c:1256
 vfs_poll include/linux/poll.h:90 [inline]
 do_pollfd fs/select.c:859 [inline]
 do_poll fs/select.c:907 [inline]
 do_sys_poll+0x4ac/0x990 fs/select.c:1001
 __do_sys_ppoll fs/select.c:1101 [inline]
 __se_sys_ppoll fs/select.c:1081 [inline]
 __x64_sys_ppoll+0x161/0x1a0 fs/select.c:1081
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880ae6e84e0 of 4 bytes by task 18104 on cpu 1:
 __skb_unlink include/linux/skbuff.h:2020 [inline]
 __skb_dequeue include/linux/skbuff.h:2040 [inline]
 skb_dequeue+0x84/0x150 net/core/skbuff.c:3040
 unix_release_sock+0x27b/0x5a0 net/unix/af_unix.c:559
 unix_release+0x3e/0x70 net/unix/af_unix.c:832
 __sock_release+0x85/0x160 net/socket.c:590
 sock_close+0x24/0x30 net/socket.c:1268
 __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:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18104 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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