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BUG: KCSAN: data-race in datagram_poll / skb_queue_tail

read to 0xffff888126bfe8d0 of 8 bytes by task 3889 on cpu 1:
 skb_queue_empty include/linux/skbuff.h:1494 [inline]
 datagram_poll+0x16e/0x300 net/core/datagram.c:780
 sock_poll+0xed/0x250 net/socket.c:1256
 vfs_poll include/linux/poll.h:90 [inline]
 ep_item_poll.isra.0+0x90/0x190 fs/eventpoll.c:892
 ep_send_events_proc+0x113/0x590 fs/eventpoll.c:1749
 ep_scan_ready_list.constprop.0+0x189/0x500 fs/eventpoll.c:704
 ep_send_events fs/eventpoll.c:1793 [inline]
 ep_poll+0xe3/0x900 fs/eventpoll.c:1930
 do_epoll_wait+0x162/0x180 fs/eventpoll.c:2294
 __do_sys_epoll_wait fs/eventpoll.c:2304 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2301 [inline]
 __x64_sys_epoll_wait+0x5e/0x80 fs/eventpoll.c:2301
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888126bfe8d0 of 8 bytes by task 16110 on cpu 0:
 __skb_insert include/linux/skbuff.h:1852 [inline]
 __skb_queue_before include/linux/skbuff.h:1958 [inline]
 __skb_queue_tail include/linux/skbuff.h:1991 [inline]
 skb_queue_tail+0x6b/0xc0 net/core/skbuff.c:3145
 __netlink_sendskb+0x50/0x80 net/netlink/af_netlink.c:1248
 netlink_broadcast_deliver net/netlink/af_netlink.c:1381 [inline]
 do_one_broadcast net/netlink/af_netlink.c:1466 [inline]
 netlink_broadcast_filtered+0x6c3/0x800 net/netlink/af_netlink.c:1510
 netlink_broadcast+0x43/0x60 net/netlink/af_netlink.c:1534
 uevent_net_broadcast_untagged lib/kobject_uevent.c:330 [inline]
 kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline]
 kobject_uevent_env+0x6b6/0xc00 lib/kobject_uevent.c:592
 kobject_uevent+0x29/0x40 lib/kobject_uevent.c:641
 device_del+0x493/0x670 drivers/base/core.c:2385
 device_unregister+0x1f/0x40 drivers/base/core.c:2407
 bdi_unregister+0x2b9/0x3a0 mm/backing-dev.c:1016
 release_bdi mm/backing-dev.c:1032 [inline]
 kref_put include/linux/kref.h:65 [inline]
 bdi_put+0x112/0x130 mm/backing-dev.c:1041
 generic_shutdown_super+0x219/0x260 fs/super.c:476
 kill_anon_super+0x2f/0x50 fs/super.c:1106
 fuse_kill_sb_anon+0x27/0x30 fs/fuse/inode.c:1337

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16110 Comm: syz-executor.2 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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