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: 18355 Comm: kworker/u4:10 Not tainted 4.4.152-ge15716b #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8801bc419800 task.stack: ffff8801c6238000
RIP: 0010:[<ffffffff8117c5cb>]  [<ffffffff8117c5cb>] get_work_pool+0xfb/0x1e0 kernel/workqueue.c:724
RSP: 0018:ffff8801c623f908  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000001ffffffe00 RCX: 0000000000000000
RDX: 00000003ffffffc0 RSI: ffffffff8117c5b3 RDI: 0000000000000046
RBP: ffff8801c623f920 R08: ffffffff8532fc20 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801bc419800 R12: ffff8800a6f98000
R13: dffffc0000000000 R14: ffff8800a6f995d8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffef2756ea8 CR3: 00000001cfa87000 CR4: 00000000001606f0
Stack:
 ffff8800a6f995b8 ffff8800a6f98000 dffffc0000000000 ffff8801c623fa60
 ffffffff811804db ffffffff81180400 ffff8801bc41a0e0 ffffed003788341b
 1ffff10038c47f2b dffffc0000000000 0000000041b58ab3 ffffffff841e5073
Call Trace:
 [<ffffffff811804db>] start_flush_work kernel/workqueue.c:2715 [inline]
 [<ffffffff811804db>] flush_work+0xdb/0x680 kernel/workqueue.c:2773
 [<ffffffff833ce9fe>] xfrm_policy_fini+0x2e/0x310 net/xfrm/xfrm_policy.c:2970
 [<ffffffff833ced05>] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3037
 [<ffffffff82f66300>] ops_exit_list.isra.6+0xb0/0x160 net/core/net_namespace.c:134
 [<ffffffff82f692c1>] cleanup_net+0x321/0x600 net/core/net_namespace.c:452
 [<ffffffff8118501f>] process_one_work+0x7df/0x1600 kernel/workqueue.c:2064
 [<ffffffff81185f19>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81193a28>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838cc995>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 9c 7f 1d 00 48 89 d8 5b 41 5c 41 5d 5d c3 e8 8d 7f 1d 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 c2 00 00 00 48 8b 1b e8 63 7f 1d 00 48 89 d8 
RIP  [<ffffffff8117c5cb>] get_work_pool+0xfb/0x1e0 kernel/workqueue.c:724
 RSP <ffff8801c623f908>
---[ end trace 192a2c29b57c3839 ]---