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BUG: KCSAN: data-race in l2tp_tunnel_del_work / sk_common_release

read to 0xffff8880a12a3cf8 of 8 bytes by task 8250 on cpu 0:
 l2tp_tunnel_del_work+0x59/0x680 net/l2tp/l2tp_core.c:1249
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff8880a12a3cf8 of 8 bytes by task 8402 on cpu 1:
 sk_set_socket include/net/sock.h:1801 [inline]
 sock_orphan include/net/sock.h:1820 [inline]
 sk_common_release+0xbf/0x210 net/core/sock.c:3194
 udp_lib_close+0x1f/0x30 include/net/udp.h:202
 inet_release+0x86/0x100 net/ipv4/af_inet.c:427
 inet6_release+0x4a/0x70 net/ipv6/af_inet6.c:470
 __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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8402 Comm: syz-executor.4 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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