IPv6: NLM_F_REPLACE set, but no existing node found!
device gre0 entered promiscuous mode
BUG: unable to handle kernel paging request at 0000000066aa29bd
IP: lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021
PGD 5e28067 P4D 5e28067 PUD 5e2a067 PMD 0 
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 4.15.0-rc1-next-20171201+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: 000000003c1449ed task.stack: 000000001574ad70
RIP: 0010:lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021
RSP: 0018:ffff8801d9ce6f28 EFLAGS: 00010046
RAX: 0000000000000007 RBX: 1ffff1003b39cdea RCX: ffffffff8438313f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d9cdce04
RBP: ffff8801d9ce7098 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: ffffffff8748cd60 R12: ffff8801d9cdc580
R13: ffff8801d9ce7070 R14: ffffffff85e1d158 R15: ffff8801d9cdc580
FS:  0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 00000001c3e0d000 CR4: 00000000001426e0
Call Trace:
 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:355 [inline]
 get_next_corpse net/netfilter/nf_conntrack_core.c:1619 [inline]
 nf_ct_iterate_cleanup+0x2ff/0x4f0 net/netfilter/nf_conntrack_core.c:1643
 nf_conntrack_cleanup_net_list+0xb9/0x2e0 net/netfilter/nf_conntrack_core.c:1841
 nf_conntrack_pernet_exit+0x11d/0x170 net/netfilter/nf_conntrack_standalone.c:700
 ops_exit_list.isra.6+0x100/0x150 net/core/net_namespace.c:145
 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:484
 process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x37a/0x440 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:517
Code: 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c4 08 00 00 41 c7 87 84 08 00 00 01 00 00 00 <cc> 3f 05 00 00 65 8b 05 3f d7 aa 7e 89 c0 48 0f a3 05 c5 6c 08 
RIP: lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021 RSP: ffff8801d9ce6f28
CR2: fffffffffffffff8
---[ end trace de01a65aa6559277 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..