Ubuntu 14.04 LTS Kernel panic when using Docker + pipework (+ dnsmasq). Sigh.

gistfile1.txt

[ 2975.325505] ------------[ cut here ]------------
[ 2975.325515] WARNING: CPU: 5 PID: 4604 at /build/buildd/linux-3.13.0/fs/sysfs/dir.c:486 sysfs_warn_dup+0x86/0xa0()
[ 2975.325517] sysfs: cannot create duplicate filename '/devices/virtual/net/em1.30/upper_ph3491eth1'
[ 2975.325519] Modules linked in: macvlan veth xt_nat bridge ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG aufs ipt_MASQUERADE iptable_nat nf_nat_ipv4 xt_limit xt_tcpudp xt_addrtype 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables snd_hda_cod
ec_realtek radeon ttm snd_hda_intel snd_hda_codec 8021q drm_kms_helper snd_hwdep snd_pcm garp snd_page_alloc drm i2c_algo_bit dcdbas gpio_ich coretemp stp mrp dell_wmi sparse_keymap ppdev llc snd_timer serio_raw s
nd i7core_edac edac_core wmi kvm_intel soundcore kvm lpc_ich mac_hid parport_pc e1000e ptp pps_core lp parport btrfs xor hid_apple usbhid hid raid6_pq libcrc32c psmouse ahci libahci
[ 2975.325579] CPU: 5 PID: 4604 Comm: ip Not tainted 3.13.0-24-generic #47-Ubuntu
[ 2975.325582] Hardware name: Dell Inc. OptiPlex 980                 /0C522T, BIOS A13 01/21/2013
[ 2975.325583]  0000000000000009 ffff8801e853d610 ffffffff81715ac4 ffff8801e853d658
[ 2975.325588]  ffff8801e853d648 ffffffff810676bd ffff8800bea77000 ffff8800bea77000
[ 2975.325591]  ffff88021325f000 0000000000000000 0000000000000001 ffff8801e853d6a8
[ 2975.325594] Call Trace:
[ 2975.325601]  [<ffffffff81715ac4>] dump_stack+0x45/0x56
[ 2975.325605]  [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
[ 2975.325608]  [<ffffffff8106772c>] warn_slowpath_fmt+0x4c/0x50
[ 2975.325612]  [<ffffffff81230936>] sysfs_warn_dup+0x86/0xa0
[ 2975.325615]  [<ffffffff81230990>] sysfs_add_one+0x40/0x50
[ 2975.325618]  [<ffffffff812314ff>] sysfs_do_create_link_sd.isra.2+0xbf/0x210
[ 2975.325621]  [<ffffffff81231675>] sysfs_create_link+0x25/0x50
[ 2975.325626]  [<ffffffff81618049>] __netdev_adjacent_dev_insert+0x1d9/0x270
[ 2975.325629]  [<ffffffff816c0031>] ? addrconf_prefix_rcv+0x191/0xa50
[ 2975.325633]  [<ffffffff8161cc4d>] __netdev_adjacent_dev_link_lists+0x2d/0x80
[ 2975.325636]  [<ffffffff8161cdc1>] __netdev_adjacent_dev_link_neighbour+0x71/0xa0[ 2975.325639]  [<ffffffff8161cf30>] __netdev_upper_dev_link+0xf0/0x460
[ 2975.325644]  [<ffffffff8108fb46>] ? raw_notifier_call_chain+0x16/0x20[ 2975.325648]  [<ffffffff81619db0>] ? dev_queue_xmit_nit+0x220/0x220
[ 2975.325651]  [<ffffffff8161d2b2>] netdev_upper_dev_link+0x12/0x20
[ 2975.325656]  [<ffffffffa0661ea7>] macvlan_common_newlink+0x197/0x3a0 [macvlan]
[ 2975.325659]  [<ffffffff81619f40>] ? netif_rx+0x190/0x190
[ 2975.325662]  [<ffffffffa06620cc>] macvlan_newlink+0x1c/0x20 [macvlan]
[ 2975.325666]  [<ffffffff8162cc15>] rtnl_newlink+0x4f5/0x5d0
[ 2975.325669]  [<ffffffff8162c85e>] ? rtnl_newlink+0x13e/0x5d0
[ 2975.325673]  [<ffffffff81629539>] rtnetlink_rcv_msg+0x99/0x260
[ 2975.325678]  [<ffffffff811a2778>] ? __kmalloc_node_track_caller+0x58/0x1e0
[ 2975.325683]  [<ffffffff8116c409>] ? zone_statistics+0x89/0xa0
[ 2975.325687]  [<ffffffff8160b45e>] ? __alloc_skb+0x7e/0x2b0
[ 2975.325690]  [<ffffffff816294a0>] ? rtnetlink_rcv+0x30/0x30
[ 2975.325694]  [<ffffffff81647a89>] netlink_rcv_skb+0xa9/0xc0
[ 2975.325697]  [<ffffffff81629498>] rtnetlink_rcv+0x28/0x30
[ 2975.325700]  [<ffffffff816470b5>] netlink_unicast+0xd5/0x1b0
[ 2975.325703]  [<ffffffff8164748f>] netlink_sendmsg+0x2ff/0x740
[ 2975.325707]  [<ffffffff8160254b>] sock_sendmsg+0x8b/0xc0
[ 2975.325712]  [<ffffffff811af0f6>] ? __mem_cgroup_commit_charge+0x156/0x3d0
[ 2975.325715]  [<ffffffff8160223e>] ? move_addr_to_kernel.part.16+0x1e/0x60
[ 2975.325718]  [<ffffffff81602df1>] ? move_addr_to_kernel+0x21/0x30
[ 2975.325722]  [<ffffffff81602db9>] ___sys_sendmsg+0x3a9/0x3c0
[ 2975.325725]  [<ffffffff81721aa4>] ? __do_page_fault+0x204/0x560
[ 2975.325731]  [<ffffffff811112fc>] ? acct_account_cputime+0x1c/0x20
[ 2975.325735]  [<ffffffff8109d76b>] ? account_user_time+0x8b/0xa0
[ 2975.325738]  [<ffffffff816034c2>] __sys_sendmsg+0x42/0x80
[ 2975.325741]  [<ffffffff81603512>] SyS_sendmsg+0x12/0x20
[ 2975.325745]  [<ffffffff817266bf>] tracesys+0xe1/0xe6
[ 2975.325747] ---[ end trace 0ed65c038331012b ]---
[ 2975.325763] ------------[ cut here ]------------
[ 2975.325794] kernel BUG at /build/buildd/linux-3.13.0/net/core/dev.c:6385!
[ 2975.325829] invalid opcode: 0000 [#1] SMP 
[ 2975.325858] Modules linked in: macvlan veth xt_nat bridge ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG aufs ipt_MASQUERADE iptable_nat nf_nat_ipv4 xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables snd_hda_codec_realtek radeon ttm snd_hda_intel snd_hda_codec 8021q drm_kms_helper snd_hwdep snd_pcm garp snd_page_alloc drm i2c_algo_bit dcdbas gpio_ich coretemp stp mrp dell_wmi sparse_keymap ppdev llc snd_timer serio_raw snd i7core_edac edac_core wmi kvm_intel soundcore kvm lpc_ich mac_hid parport_pc e1000e ptp pps_core lp parport btrfs xor hid_apple usbhid hid raid6_pq libcrc32c psmouse ahci libahci
[ 2975.326458] CPU: 5 PID: 4604 Comm: ip Tainted: G        W    3.13.0-24-generic #47-Ubuntu
[ 2975.326499] Hardware name: Dell Inc. OptiPlex 980                 /0C522T, BIOS A13 01/21/2013
[ 2975.326543] task: ffff8800d66a2fe0 ti: ffff8801e853c000 task.ti: ffff8801e853c000
[ 2975.326580] RIP: 0010:[<ffffffff8161ea1f>]  [<ffffffff8161ea1f>] free_netdev+0xff/0x110
[ 2975.326625] RSP: 0018:ffff8801e853d8d8  EFLAGS: 00010293[ 2975.326653] RAX: 0000000000000001 RBX: ffff8800bea70018 RCX: 00000000000001a1
[ 2975.326689] RDX: 0000000000000001 RSI: 0000000016421640 RDI: 0000000000000282[ 2975.326719] RBP: ffff8801e853d8f0 R08: 0003c168fffffee0 R09: ffffffc0fffffee0
[ 2975.326739] R10: ffffffc0fffffee0 R11: 00000004fffffff8 R12: ffff8800bea70060
[ 2975.326759] R13: ffff8800bea70000 R14: ffff8801e853d900 R15: ffffffffa0664000
[ 2975.326779] FS:  00007f2177c68740(0000) GS:ffff88021fd40000(0000) knlGS:0000000000000000
[ 2975.326802] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2975.326818] CR2: 00007fff1c54e660 CR3: 00000001e8dff000 CR4: 00000000000007e0
[ 2975.326838] Stack:
[ 2975.326845]  00000000ffffffef ffffffff81cd9b00 ffff8801e853d920 ffff8801e853dae8
[ 2975.326874]  ffffffff8162cc98 0000000000000000 ffff88020fdcda4c 0000000000000000
[ 2975.326902]  ffffffff8162c85e ffffffff81cd9b00 ffff88020fdcda10 ffff8800bea70000
[ 2975.326930] Call Trace:
[ 2975.326940]  [<ffffffff8162cc98>] rtnl_newlink+0x578/0x5d0
[ 2975.326956]  [<ffffffff8162c85e>] ? rtnl_newlink+0x13e/0x5d0
[ 2975.326974]  [<ffffffff81629539>] rtnetlink_rcv_msg+0x99/0x260
[ 2975.326992]  [<ffffffff811a2778>] ? __kmalloc_node_track_caller+0x58/0x1e0
[ 2975.327012]  [<ffffffff8116c409>] ? zone_statistics+0x89/0xa0
[ 2975.327029]  [<ffffffff8160b45e>] ? __alloc_skb+0x7e/0x2b0
[ 2975.327046]  [<ffffffff816294a0>] ? rtnetlink_rcv+0x30/0x30
[ 2975.327063]  [<ffffffff81647a89>] netlink_rcv_skb+0xa9/0xc0
[ 2975.327079]  [<ffffffff81629498>] rtnetlink_rcv+0x28/0x30
[ 2975.327095]  [<ffffffff816470b5>] netlink_unicast+0xd5/0x1b0
[ 2975.327112]  [<ffffffff8164748f>] netlink_sendmsg+0x2ff/0x740
[ 2975.327130]  [<ffffffff8160254b>] sock_sendmsg+0x8b/0xc0
[ 2975.327150]  [<ffffffff811af0f6>] ? __mem_cgroup_commit_charge+0x156/0x3d0
[ 2975.327180]  [<ffffffff8160223e>] ? move_addr_to_kernel.part.16+0x1e/0x60
[ 2975.327216]  [<ffffffff81602df1>] ? move_addr_to_kernel+0x21/0x30
[ 2975.327249]  [<ffffffff81602db9>] ___sys_sendmsg+0x3a9/0x3c0
[ 2975.327280]  [<ffffffff81721aa4>] ? __do_page_fault+0x204/0x560
[ 2975.327313]  [<ffffffff811112fc>] ? acct_account_cputime+0x1c/0x20
[ 2975.327345]  [<ffffffff8109d76b>] ? account_user_time+0x8b/0xa0
[ 2975.327378]  [<ffffffff816034c2>] __sys_sendmsg+0x42/0x80
[ 2975.327407]  [<ffffffff81603512>] SyS_sendmsg+0x12/0x20
[ 2975.327435]  [<ffffffff817266bf>] tracesys+0xe1/0xe6
[ 2975.327461] Code: b8 e6 ff 5b 41 5c 41 5d 5d c3 66 90 e8 1b 8d b6 ff e9 53 ff ff ff 66 0f 1f 44 00 00 4c 89 ef e8 b8 fe ff ff 5b 41 5c 41 5d 5d c3 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 
[ 2975.327772] RIP  [<ffffffff8161ea1f>] free_netdev+0xff/0x110
[ 2975.327805]  RSP <ffff8801e853d8d8>
[ 2975.345783] ---[ end trace 0ed65c038331012c ]---

I had the same problem. The issue was renaming the macvlan in the network namespace. If you never change the name, everything gets cleaned up when you delete the interface.