==================================================================
BUG: KASAN: slab-out-of-bounds in __collect_expired_timers include/linux/list.h:729 [inline]
BUG: KASAN: slab-out-of-bounds in collect_expired_timers kernel/time/timer.c:1569 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 6cb69067 P4D 6cb69067 PUD 6cc91067 PMD 0 
Oops: 0010 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5 Comm: kworker/u8:0 Not tainted 4.13.0-rc7-next-20170901+ #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: netns cleanup_net
task: ffff88003ebd6140 task.stack: ffff88003ebd8000
RIP: 0010:          (null)
RSP: 0018:ffff88003ed07780 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 1ffff10007da0ef6 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff85b380e0 RDI: 0000000000000000
RBP: ffff88003ed07958 R08: ffff88003ed070f0 R09: ffff88003ed070e8
R10: ffff88003ed07060 R11: 1ffff10007d7aebb R12: ffff88003ed07930
R13: ffff88003a24c340 R14: 0000000000000101 R15: ffff88003ed078d0
FS:  0000000000000000(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000069caf000 CR4: 00000000000026e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 expire_timers kernel/time/timer.c:1320 [inline]
 __run_timers+0x7fd/0xb90 kernel/time/timer.c:1620
 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:814 [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: 1ffffffff0b59305 RSI: 000000004e1d38ec RDI: 0000000000000282
RBP: ffff88003ebdf090 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff8705fca0 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_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+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:  Bad RIP value.
RIP:           (null) RSP: ffff88003ed07780
CR2: 0000000000000000
---[ end trace 0c4cf53adecb3452 ]---