Configuring IPIP Tunnel Causes Kernel Panic

[Wilton Wong]

Attempting to create an IPIP tunnel with no additional information using the following python script will cause an Opps.

<SNIP>
#!/usr/bin/python

# Requirements
#
# PIP: sudo apt-get install python-pip
# pyroute2: sudo pip install pyroute2

import sys
import string
import logging
from pyroute2 import IPRoute
from pyroute2 import IPRouteRequest

def main():
    logging.basicConfig()
    ip = IPRoute()

    if not ip.link_lookup(ifname='tun0'):
        print('Adding tun0')
        #print(ip.create(kind='ipip', local=host_ipaddr, remote=str(x), tty=64, ifname='tun' + host_number).review())
        #ip.create(kind='gre', ifname='tun0', gre_local='10.142.0.2', gre_remote='10.142.0.3', gre_ttl=16).commit()
        ip.link('add', ifname='tun0', kind='ipip')
    ip.close()
    return

main()
</SNIP>

Opps follows:
[ 2179.960121] ipip: IPv4 over IPv4 tunneling driver
[ 2179.968023] BUG: unable to handle kernel NULL pointer dereference at 0000000000000108
[ 2179.968176] IP: [<ffffffffc00e69a5>] ipip_netlink_fan.isra.7+0x5/0x230 [ipip]
[ 2179.968234] PGD da0fe067 PUD d9c66067 PMD 0
[ 2179.968283] Oops: 0000 [#1] SMP
[ 2179.968326] Modules linked in: ipip tunnel4 ip_tunnel ppdev crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw snd_intel8x0 gf128mul glue_helper ablk_helper cryptd snd_ac97_codec ac97_bus input_leds serio_raw vboxvideo snd_pcm joydev vboxguest i2c_piix4 snd_timer snd soundcore drm 8250_fintek parport_pc video lp parport mac_hid hid_generic usbhid hid psmouse ahci libahci e1000 pata_acpi
[ 2179.968644] CPU: 0 PID: 1427 Comm: crash.py Not tainted 4.2.0-38-generic #45~14.04.1-Ubuntu
[ 2179.968730] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 2179.968815] task: ffff880036b66040 ti: ffff8800da2c0000 task.ti: ffff8800da2c0000
[ 2179.968897] RIP: 0010:[<ffffffffc00e69a5>] [<ffffffffc00e69a5>] ipip_netlink_fan.isra.7+0x5/0x230 [ipip]
[ 2179.968989] RSP: 0018:ffff8800da2c3840 EFLAGS: 00010246
[ 2179.969036] RAX: ffff8800da2c3858 RBX: 0000000000000000 RCX: 0000000000000000
[ 2179.969088] RDX: ffff8800da2c3888 RSI: ffff88011a3e8840 RDI: 0000000000000000
[ 2179.969144] RBP: ffff8800da2c38b8 R08: 0000000000000000 R09: 0000000000000000
[ 2179.969196] R10: ffffffff816b8789 R11: 0000000000020209 R12: ffff88011a3e8000
[ 2179.969249] R13: ffff88011a3e8840 R14: ffff8800da2c3a80 R15: ffffffffc00e8100
[ 2179.969301] FS: 00007fc223507740(0000) GS:ffff88011fc00000(0000) knlGS:0000000000000000
[ 2179.969410] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2179.970022] CR2: 0000000000000108 CR3: 00000000d9e1f000 CR4: 00000000000406f0
[ 2179.970560] Stack:
[ 2179.971089] ffffffffc00e6d12 fffffffffffffff4 0000000000000000 0000000000000000
[ 2179.972154] 0000000000000000 0000000000000000 0000000000000000 0000000000000045
[ 2179.973229] 0000000000000400 ffff880000000000 00000000ffe567fb ffffffff81cedd80
[ 2179.974326] Call Trace:
[ 2179.974862] [<ffffffffc00e6d12>] ? ipip_newlink+0x72/0xa6 [ipip]
[ 2179.975421] [<ffffffff816c92aa>] rtnl_newlink+0x6ca/0x880
[ 2179.975951] [<ffffffff8108e073>] ? __request_module+0x1b3/0x2b0
[ 2179.976473] [<ffffffff813d6333>] ? nla_parse+0xa3/0x100
[ 2179.976972] [<ffffffff813d63eb>] ? nla_strlcpy+0x5b/0x70
[ 2179.977468] [<ffffffff816c5a09>] ? rtnl_link_ops_get+0x39/0x50
[ 2179.977953] [<ffffffff816c8d3c>] ? rtnl_newlink+0x15c/0x880
[ 2179.978428] [<ffffffff816c6605>] rtnetlink_rcv_msg+0x95/0x240
[ 2179.978891] [<ffffffff816a3d6e>] ? __alloc_skb+0x7e/0x280
[ 2179.979341] [<ffffffff816c6570>] ? rtnetlink_rcv+0x40/0x40
[ 2179.979781] [<ffffffff816e84df>] netlink_rcv_skb+0xaf/0xc0
[ 2179.980207] [<ffffffff816c655c>] rtnetlink_rcv+0x2c/0x40
[ 2179.980610] [<ffffffff816e7bf2>] netlink_unicast+0xf2/0x1f0
[ 2179.981031] [<ffffffff816e80c9>] netlink_sendmsg+0x3d9/0x630
[ 2179.981449] [<ffffffff81358e5a>] ? aa_sock_msg_perm+0x5a/0x140
[ 2179.981861] [<ffffffff8169b548>] sock_sendmsg+0x38/0x50
[ 2179.982277] [<ffffffff8169b9e2>] SYSC_sendto+0x102/0x190
[ 2179.982690] [<ffffffff810a0ab4>] ? finish_task_switch+0x64/0x230
[ 2179.983081] [<ffffffff810661d7>] ? __do_page_fault+0x1b7/0x430
[ 2179.983479] [<ffffffff817bec88>] ? __schedule+0x358/0x930
[ 2179.983862] [<ffffffff8169c4de>] SyS_sendto+0xe/0x10
[ 2179.984240] [<ffffffff817c2b32>] entry_SYSCALL_64_fastpath+0x16/0x75
[ 2179.984601] Code: 5d c3 41 8b 84 24 c8 00 00 00 49 03 84 24 d0 00 00 00 4c 29 f0 66 41 89 06 eb d5 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 <48> 8b 87 08 01 00 00 48 85 c0 0f 84 68 01 00 00 44 8b 1a 45 85
[ 2179.986346] RIP [<ffffffffc00e69a5>] ipip_netlink_fan.isra.7+0x5/0x230 [ipip]
[ 2179.987454] RSP <ffff8800da2c3840>
[ 2179.987813] CR2: 0000000000000108
[ 2179.988190] ---[ end trace bfd4b5c73a45e3b6 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-38-generic 4.2.0-38.45~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-38.45~14.04.1-generic 4.2.8-ckt10
Uname: Linux 4.2.0-38-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Sun Jun 26 00:06:31 2016
InstallationDate: Installed on 2016-06-26 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lts-wily
UpgradeStatus: No upgrade log present (probably fresh install)