kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3983 Comm: kworker/u4:3 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8800ba0fe000 task.stack: ffff8800af440000
RIP: 0010:[<ffffffff81177ffb>]  [<ffffffff81177ffb>] get_work_pool+0xfb/0x1e0 kernel/workqueue.c:724
RSP: 0018:ffff8800af447900  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000001ffffffe00 RCX: ffffffff81177fe3
RDX: 00000003ffffffc0 RSI: ffffffff842bdb60 RDI: 0000000000000046
RBP: ffff8800af447918 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10015e88ef0 R12: 1ffff10015e88f2a
R13: ffff8800af447bd8 R14: dffffc0000000000 R15: ffff8801c9c3f098
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4236db000 CR3: 00000000b5704000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c9c3f078 1ffff10015e88f2a ffff8800af447bd8 ffff8800af447a58
 ffffffff8117bf05 ffffffff8117be30 0000000000000002 0000000000000007
 ffff8800ba0fe000 dffffc0000000000 0000000041b58ab3 ffffffff83faab15
Call Trace:
 [<ffffffff8117bf05>] start_flush_work kernel/workqueue.c:2715 [inline]
 [<ffffffff8117bf05>] flush_work+0xd5/0x690 kernel/workqueue.c:2773
 [<ffffffff8329ef9e>] xfrm_policy_fini+0x2e/0x300 net/xfrm/xfrm_policy.c:2965
 [<ffffffff8329f295>] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3032
 [<ffffffff82e2ac7e>] ops_exit_list.isra.4+0xae/0x150 net/core/net_namespace.c:134
 [<ffffffff82e2dc2d>] cleanup_net+0x31d/0x5f0 net/core/net_namespace.c:433
 [<ffffffff8117fd37>] process_one_work+0x7d7/0x16e0 kernel/workqueue.c:2064
 [<ffffffff81180d19>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81190788>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83773d85>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: 7c 8d 1e 00 48 89 d8 5b 41 5c 41 5d 5d c3 e8 6d 8d 1e 00 48 81 e3 00 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 b8 00 00 00 48 8b 1b e8 43 8d 1e 00 48 89 d8 
RIP  [<ffffffff81177ffb>] get_work_pool+0xfb/0x1e0 kernel/workqueue.c:724
 RSP <ffff8800af447900>
---[ end trace b5dccafebd877a33 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..