------------[ cut here ]------------
kernel BUG at net/ipv4/tcp_output.c:2864!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 116 Comm: kworker/u4:3 Not tainted 4.16.0-rc6+ #359
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__tcp_retransmit_skb+0x28e6/0x2cb0 net/ipv4/tcp_output.c:2864
RSP: 0018:ffff8801db306ff8 EFLAGS: 00010206
RAX: ffff8801d907c700 RBX: 0000000000000001 RCX: ffffffff84cadc16
RDX: 0000000000000100 RSI: ffff8801d7206238 RDI: ffff8801b403b2ac
RBP: ffff8801db3073a8 R08: ffff88021fff805c R09: 0000000000000000
R10: 000000008c22b7e5 R11: ffff88021fff805d R12: ffff8801b403b30e
R13: 00000000447d9671 R14: ffff8801b403b280 R15: ffff8801d7206000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006fa318 CR3: 0000000006e22001 CR4: 00000000001626e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 tcp_retransmit_skb+0x2e/0x230 net/ipv4/tcp_output.c:2950
 tcp_retransmit_timer+0xefc/0x2dd0 net/ipv4/tcp_timer.c:487
 tcp_write_timer_handler+0x335/0x820 net/ipv4/tcp_timer.c:572
 tcp_write_timer+0x153/0x170 net/ipv4/tcp_timer.c:592
 call_timer_fn+0x228/0x820 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0x7ee/0xb70 kernel/time/timer.c:1666
 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x1cc/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:541 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:778 [inline]
RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:3960
RSP: 0018:ffff8801d908f000 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff12
RAX: dffffc0000000000 RBX: 0000000000000282 RCX: ffffffff84c3fb0b
RDX: 1ffffffff0dd939d RSI: ffffffff86f42ec0 RDI: 0000000000000282
RBP: ffff8801d908f020 R08: 0000000000000000 R09: 1ffff1003b211df9
R10: ffff8801d908ef90 R11: 0000000000000003 R12: ffff8801d907c700
R13: 0000000000000000 R14: 0000000000000109 R15: dffffc0000000000
 lock_is_held include/linux/lockdep.h:344 [inline]
 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline]
 ___might_sleep+0x35e/0x470 kernel/sched/core.c:6098
 inet_twsk_purge+0x36e/0x770 net/ipv4/inet_timewait_sock.c:265
 dccp_v6_exit_batch+0x1a/0x20 net/dccp/ipv6.c:1112
 ops_exit_list.isra.6+0x100/0x150 net/core/net_namespace.c:145
 cleanup_net+0x6a1/0xcb0 net/core/net_namespace.c:517
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Code: ff e8 3f 7d de fc e9 3b f2 ff ff e8 55 7d de fc e9 ab fc ff ff 48 8b bd c8 fc ff ff e8 e4 7c de fc e9 06 e8 ff ff e8 0a 3c a6 fc <0f> 0b e8 13 7d de fc e9 cd fa ff ff 48 89 8d 78 fc ff ff e8 02 
RIP: __tcp_retransmit_skb+0x28e6/0x2cb0 net/ipv4/tcp_output.c:2864 RSP: ffff8801db306ff8
---[ end trace 1953ca7ab0a7f5f2 ]---