kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 6 Comm: kworker/u4:0 Not tainted 4.9.86-gb324a70 #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8801d9b40000 task.stack: ffff8801d9b48000
RIP: 0010:[<ffffffff81180416>]  [<ffffffff81180416>] get_work_pool+0xf6/0x1d0 kernel/workqueue.c:716
RSP: 0018:ffff8801d9b4f8f8  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000001ffffffe00 RCX: ffffffff811803fe
RDX: 00000003ffffffc0 RSI: ffffffff844de3a0 RDI: 0000000000000046
RBP: ffff8801d9b4f910 R08: 1ffff1003b368124 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d9b40000 R12: 1ffff1003b369f29
R13: ffff8801d9b4fbd0 R14: dffffc0000000000 R15: ffff8801d7bd61d0
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072c000 CR3: 000000000441e000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d7bd61b0 1ffff1003b369f29 ffff8801d9b4fbd0 ffff8801d9b4fa50
 ffffffff81185715 ffffffff81185640 0000000000000002 0000000000000007
 ffff8801d9b40000 dffffc0000000000 0000000041b58ab3 ffffffff8418bf04
Call Trace:
 [<ffffffff81185715>] start_flush_work kernel/workqueue.c:2785 [inline]
 [<ffffffff81185715>] flush_work+0xd5/0x6f0 kernel/workqueue.c:2845
 [<ffffffff833be12e>] xfrm_policy_fini+0x2e/0x310 net/xfrm/xfrm_policy.c:2998
 [<ffffffff833be435>] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3065
 [<ffffffff82f1b8de>] ops_exit_list.isra.4+0xae/0x150 net/core/net_namespace.c:136
 [<ffffffff82f1e79d>] cleanup_net+0x31d/0x610 net/core/net_namespace.c:454
 [<ffffffff811898a0>] process_one_work+0x7e0/0x1610 kernel/workqueue.c:2092
 [<ffffffff8118a7b0>] worker_thread+0xe0/0x10d0 kernel/workqueue.c:2226
 [<ffffffff8119a7bd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b57ac>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:374
Code: f1 af 1e 00 48 89 d8 5b 41 5c 41 5d 5d c3 e8 e2 af 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 bc 00 00 00 48 8b 1b e8 b8 af 1e 00 48 89 d8 
RIP  [<ffffffff81180416>] get_work_pool+0xf6/0x1d0 kernel/workqueue.c:716
 RSP <ffff8801d9b4f8f8>
---[ end trace b5d9a65907d5b520 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..