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: 13977 Comm: kworker/u4:28 Not tainted 4.9.118-g47b77b8 #72
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8801a15fc800 task.stack: ffff880196a50000
RIP: 0010:[<ffffffff81184046>]  [<ffffffff81184046>] get_work_pool+0xf6/0x1e0 kernel/workqueue.c:716
RSP: 0018:ffff880196a57908  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000001ffffffe00 RCX: 0000000000000000
RDX: 00000003ffffffc0 RSI: ffffffff8118402e RDI: 0000000000000046
RBP: ffff880196a57920 R08: ffff8801a15fd160 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff100342bfa27 R12: ffff8801ac5dc770
R13: ffff880196a57bd8 R14: ffff8801ac5dc790 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7504be140 CR3: 000000000461e000 CR4: 00000000001606f0
Stack:
 dffffc0000000000 ffff8801ac5dc770 ffff880196a57bd8 ffff880196a57a60
 ffffffff811894dc ffffffff81189400 ffff8801a15fd0c8 1ffff10032d4af2b
 ffff8801a15fc800 dffffc0000000000 0000000041b58ab3 ffffffff843bcadf
Call Trace:
 [<ffffffff811894dc>] start_flush_work kernel/workqueue.c:2785 [inline]
 [<ffffffff811894dc>] flush_work+0xdc/0x6c0 kernel/workqueue.c:2845
 [<ffffffff834f77fe>] xfrm_policy_fini+0x2e/0x310 net/xfrm/xfrm_policy.c:2998
 [<ffffffff834f7b05>] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3065
 [<ffffffff8305be20>] ops_exit_list.isra.6+0xb0/0x160 net/core/net_namespace.c:136
 [<ffffffff8305ecf1>] cleanup_net+0x321/0x630 net/core/net_namespace.c:473
 [<ffffffff8118d181>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df76>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcc5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 91 aa 1d 00 48 89 d8 5b 41 5c 41 5d 5d c3 e8 82 aa 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 c6 00 00 00 48 8b 1b e8 58 aa 1d 00 48 89 d8 
RIP  [<ffffffff81184046>] get_work_pool+0xf6/0x1e0 kernel/workqueue.c:716
 RSP <ffff880196a57908>
---[ end trace 5c3d02cc1556002e ]---