kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 3 PID: 5 Comm: kworker/u8:0 Not tainted 4.13.0-next-20170915+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: netns cleanup_net
task: ffff88003ebd6140 task.stack: ffff88003ebd8000
RIP: 0010:__hlist_del include/linux/list.h:650 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:791 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1309 [inline]
RIP: 0010:__run_timers+0x619/0xb90 kernel/time/timer.c:1620
RSP: 0018:ffff88006df07968 EFLAGS: 00010806
RAX: 1bd5a00000000041 RBX: ffff880057863ac0 RCX: 1ffff1000dbe0f76
RDX: ffff88006df07bb0 RSI: 0000000000000008 RDI: dead000000000208
RBP: ffff88006df07c58 R08: ffff88006df072b8 R09: ffff88006df072b0
R10: ffff88006df07228 R11: 1ffff10007d7aebb R12: ffff880057863ac8
R13: dffffc0000000000 R14: dead000000000200 R15: ffff88006df07c30
FS:  0000000000000000(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c43cc1b000 CR3: 0000000038dca000 CR4: 00000000000026e0
Call Trace:
 <IRQ>
 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x177/0x710 arch/x86/kernel/apic/apic.c:1048
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline]
RIP: 0010:lock_acquire+0x256/0x580 kernel/locking/lockdep.c:4005
RSP: 0018:ffff88003ebdef98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: ffff88003ebd6140 RCX: 0000000000000000
RDX: 1ffffffff0b5933d RSI: 00000000871c1eea RDI: 0000000000000282
RBP: ffff88003ebdf090 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff87061ce0 R12: 1ffff10007d7bdf9
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:244 [inline]
 rcu_read_lock include/linux/rcupdate.h:630 [inline]
 inet_twsk_purge+0x39f/0x770 net/ipv4/inet_timewait_sock.c:271
 dccp_v4_exit_batch+0x1a/0x20 net/dccp/ipv4.c:1024
 ops_exit_list.isra.6+0x100/0x150 net/core/net_namespace.c:145
 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483
 process_one_work+0xbfa/0x1bd0 kernel/workqueue.c:2119
 worker_thread+0x223/0x1860 kernel/workqueue.c:2253
 kthread+0x39c/0x470 kernel/kthread.c:231
 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
Code: 4d 85 f6 4c 89 32 48 89 95 58 fd ff ff 42 c6 04 28 f8 74 26 e8 a9 33 10 00 49 8d 7e 08 48 8b 95 58 fd ff ff 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 b5 04 00 00 49 89 56 08 e8 83 33 10 00 4c 
RIP: __hlist_del include/linux/list.h:650 [inline] RSP: ffff88006df07968
RIP: detach_timer kernel/time/timer.c:791 [inline] RSP: ffff88006df07968
RIP: expire_timers kernel/time/timer.c:1309 [inline] RSP: ffff88006df07968
RIP: __run_timers+0x619/0xb90 kernel/time/timer.c:1620 RSP: ffff88006df07968
---[ end trace 625f2ca1e295ae6c ]---