BUG: unable to handle kernel paging request at 000000009a87be9d
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: 17 Comm: kworker/1:0 Not tainted 4.15.0-rc1-next-20171201+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient gc_worker
task: 00000000241cf5dd task.stack: 00000000c920a7bd
RIP: 0010:lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021
RSP: 0018:ffff8801da3ef1d0 EFLAGS: 00010046
RAX: 0000000000000007 RBX: 1ffff1003b47de3f RCX: ffffffff84386e9e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da3d6d04
RBP: ffff8801da3ef340 R08: 1ffff1003b47de38 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da3d6480
R13: ffff8801da3ef318 R14: ffffffff85f44c40 R15: ffff8801da3d6480
FS:  0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 00000001cbe6a000 CR4: 00000000001426e0
Call Trace:
 rcu_lock_release include/linux/rcupdate.h:249 [inline]
 rcu_read_unlock include/linux/rcupdate.h:686 [inline]
 gc_worker+0x716/0xdc0 net/netfilter/nf_conntrack_core.c:1046
 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: ffff8801da3ef1d0
CR2: fffffffffffffff8
---[ end trace 2507e757d7a435ef ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..