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: 1 PID: 4768 Comm: kworker/u4:5 Not tainted 4.9.95-g142d4b5 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8801bdfa0000 task.stack: ffff8801c3560000
RIP: 0010:[<ffffffff81181cc6>]  [<ffffffff81181cc6>] get_work_pool+0xf6/0x1e0 kernel/workqueue.c:716
RSP: 0018:ffff8801c3567908  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000001ffffffe00 RCX: 0000000000000000
RDX: 00000003ffffffc0 RSI: ffffffff81181cae RDI: 0000000000000046
RBP: ffff8801c3567920 R08: ffff8801bdfa0960 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10037bf4127 R12: ffff8801b668ad30
R13: ffff8801c3567bd8 R14: ffff8801b668ad50 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000009bcf10 CR3: 00000001cdb8a000 CR4: 0000000000160670
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 dffffc0000000000 ffff8801b668ad30 ffff8801c3567bd8 ffff8801c3567a60
 ffffffff8118715c ffffffff81187080 ffff8801bdfa08c8 1ffff100386acf2b
 ffff8801bdfa0000 dffffc0000000000 0000000041b58ab3 ffffffff841b892f
Call Trace:
 [<ffffffff8118715c>] start_flush_work kernel/workqueue.c:2785 [inline]
 [<ffffffff8118715c>] flush_work+0xdc/0x6c0 kernel/workqueue.c:2845
 [<ffffffff834eef0e>] xfrm_policy_fini+0x2e/0x310 net/xfrm/xfrm_policy.c:2998
 [<ffffffff834ef215>] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3065
 [<ffffffff83054c80>] ops_exit_list.isra.6+0xb0/0x160 net/core/net_namespace.c:136
 [<ffffffff83057b51>] cleanup_net+0x321/0x630 net/core/net_namespace.c:473
 [<ffffffff8118ae01>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118bbf6>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119ad2d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f34dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 31 ad 1d 00 48 89 d8 5b 41 5c 41 5d 5d c3 e8 22 ad 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 f8 ac 1d 00 48 89 d8 
RIP  [<ffffffff81181cc6>] get_work_pool+0xf6/0x1e0 kernel/workqueue.c:716
 RSP <ffff8801c3567908>
---[ end trace 340b687b63bfb3ba ]---