BUG: unable to handle kernel paging request at ffffe8ff00000000
PGD 1ce057067 P4D 1ce057067 PUD 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 1260 Comm: kworker/u4:3 Not tainted 4.17.0+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__skb_unlink include/linux/skbuff.h:1842 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:1862 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2584 [inline]
RIP: 0010:gro_cells_destroy+0x2bc/0x640 net/core/gro_cells.c:88
RSP: 0018:ffff88007e85f8e8 EFLAGS: 00010246
RAX: ffffe8ffffc48010 RBX: ffffe8ff00000000 RCX: ffff8801bb730010
RDX: ffff8801bb730010 RSI: aaaaaaaaaaaab000 RDI: ffffea000a64c340
RBP: ffff88007e85f980 R08: 0000000000000000 R09: ffff88021fc39050
R10: 0000000000000000 R11: ffffffff888dcd50 R12: 0000000000000000
R13: 00000000ffffffff R14: ffff8801bb75f010 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffe8ff00000000 CR3: 000000016b99a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 ip_tunnel_dev_free+0x3b/0xa0 net/ipv4/ip_tunnel.c:960
 netdev_run_todo+0x1115/0x1530 net/core/dev.c:8217
 rtnl_unlock+0x13/0x20 net/core/rtnetlink.c:114
 ip_tunnel_delete_nets+0x68a/0x6a0 net/ipv4/ip_tunnel.c:1074
 ipgre_exit_batch_net+0x6c/0x80 net/ipv4/ip_gre.c:1047
 ops_exit_list net/core/net_namespace.c:155 [inline]
 cleanup_net+0xbca/0x16b0 net/core/net_namespace.c:523
 process_one_work+0x12e4/0x1fa0 kernel/workqueue.c:2145
 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279
 kthread+0x4db/0x6c0 kernel/kthread.c:241
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415
Code: 01 00 00 41 83 c5 ff 45 89 26 45 85 e4 0f 85 9e 01 00 00 48 8b 45 90 44 89 28 4c 8b 65 88 4d 85 e4 0f 85 99 01 00 00 48 8b 5d 80 <4c> 8b 33 48 89 df e8 49 b5 c9 f9 4c 8d 6b 08 4c 8b 38 8b 02 89 
RIP: __skb_unlink include/linux/skbuff.h:1842 [inline] RSP: ffff88007e85f8e8
RIP: __skb_dequeue include/linux/skbuff.h:1862 [inline] RSP: ffff88007e85f8e8
RIP: __skb_queue_purge include/linux/skbuff.h:2584 [inline] RSP: ffff88007e85f8e8
RIP: gro_cells_destroy+0x2bc/0x640 net/core/gro_cells.c:88 RSP: ffff88007e85f8e8
CR2: ffffe8ff00000000
---[ end trace bb0c5a446131cac4 ]---