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[Bug 1488815] Missing required logs.

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This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1488815

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1488815

Title:
  Kernel traces with skb_warn_bad_offload showing up during an AIO
  deployment on Ubuntu 14.04

Status in openstack-ansible:
  Confirmed
Status in openstack-ansible juno series:
  Confirmed
Status in openstack-ansible kilo series:
  Confirmed
Status in openstack-ansible trunk series:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete
Status in qemu-kvm package in Ubuntu:
  New

Bug description:
  Setting up an os-ansible-deployment AIO in a VM running in KVM results
  in kernel traces with skb_warn_bad_offload during the setup phase.

  This is happening regardless of the kernel (tested with 3.13, 3.16 and
  3.19) on a fresh VM with no specific customization.

  Order of steps to reproduce:

  1) launch image from ubuntu cloud catalog
  2) apt-get diet-upgrade
  3) apt-get install git linux-image-virtual-lts-vivid
  4) git clone https://github.com/stackforge/os-ansible-deployment.git
  5) cd os-ansible-deployment
  6) git checkout kilo
  7) ./scripts/bootstrap-ansible.sh
  8) ./scripts/run-aio-build.sh

  This appears to be harmless as the deployment eventually succeeds.

  
  Here is a brief extract of the traces:

  Aug 26 07:57:27 test-osad kernel: [ 4695.687317] ------------[ cut here ]------------
  Aug 26 07:57:27 test-osad kernel: [ 4695.687328] WARNING: CPU: 0 PID: 20433 at /build/linux-lts-vivid-BZwsXG/linux-lts-vivid-3.19.0/net/core/dev.c:2302 skb_warn_bad_offload+0xd5/0xe2()
  Aug 26 07:57:27 test-osad kernel: [ 4695.687332] : caps=(0x000000801fdb78e9, 0x000000801fdb78e9) len=4396 data_len=2920 gso_size=1448 gso_type=1 ip_summed=3
  Aug 26 07:57:27 test-osad kernel: [ 4695.687334] Modules linked in: vhost_net vhost macvtap macvlan nbd iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ipt_REJECT nf_reject_ipv4 ip6table_filter ip6_tables dm_snapshot dm_bufio dm_multipath scsi_dh 8021q garp mrp veth ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_CHECKSUM xt_tcpudp bridge stp llc btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c vxlan ip6_udp_tunnel udp_tunnel iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter ip_tables x_tables dm_crypt kvm_amd ppdev kvm parport_pc parport serio_raw crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy
  Aug 26 07:57:27 test-osad kernel: [ 4695.687390] CPU: 0 PID: 20433 Comm: ssh Tainted: G        W      3.19.0-26-generic #28~14.04.1-Ubuntu
  Aug 26 07:57:27 test-osad kernel: [ 4695.687392] Hardware name: OpenStack Foundation OpenStack Nova, BIOS Bochs 01/01/2011
  Aug 26 07:57:27 test-osad kernel: [ 4695.687395]  ffffffff81b3db38 ffff880266e576f8 ffffffff817aeed7 0000000000000000
  Aug 26 07:57:27 test-osad kernel: [ 4695.687399]  ffff880266e57748 ffff880266e57738 ffffffff81074d8a ffff880266e57788
  Aug 26 07:57:27 test-osad kernel: [ 4695.687402]  ffff8803736ef4e8 ffff88042caba000 0000000000000001 0000000000000003
  Aug 26 07:57:27 test-osad kernel: [ 4695.687406] Call Trace:
  Aug 26 07:57:27 test-osad kernel: [ 4695.687414]  [<ffffffff817aeed7>] dump_stack+0x45/0x57
  Aug 26 07:57:27 test-osad kernel: [ 4695.687420]  [<ffffffff81074d8a>] warn_slowpath_common+0x8a/0xc0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687424]  [<ffffffff81074e06>] warn_slowpath_fmt+0x46/0x50
  Aug 26 07:57:27 test-osad kernel: [ 4695.687427]  [<ffffffff817b185a>] skb_warn_bad_offload+0xd5/0xe2
  Aug 26 07:57:27 test-osad kernel: [ 4695.687434]  [<ffffffff816a669c>] skb_checksum_help+0x1ac/0x1c0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687441]  [<ffffffffc05ea079>] checksum_tg+0x29/0x30 [xt_CHECKSUM]
  Aug 26 07:57:27 test-osad kernel: [ 4695.687446]  [<ffffffffc0476009>] ipt_do_table+0x2d9/0x6bd [ip_tables]
  Aug 26 07:57:27 test-osad kernel: [ 4695.687451]  [<ffffffffc0476062>] ? ipt_do_table+0x332/0x6bd [ip_tables]
  Aug 26 07:57:27 test-osad kernel: [ 4695.687455]  [<ffffffffc0476062>] ? ipt_do_table+0x332/0x6bd [ip_tables]
  Aug 26 07:57:27 test-osad kernel: [ 4695.687461]  [<ffffffff816e7cf0>] ? ip_fragment+0x8a0/0x8a0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687464]  [<ffffffffc0484066>] iptable_mangle_hook+0x66/0x140 [iptable_mangle]
  Aug 26 07:57:27 test-osad kernel: [ 4695.687467]  [<ffffffff816e7cf0>] ? ip_fragment+0x8a0/0x8a0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687470]  [<ffffffff816dcb1a>] nf_iterate+0x9a/0xb0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687472]  [<ffffffff816e7cf0>] ? ip_fragment+0x8a0/0x8a0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687475]  [<ffffffff816dcba4>] nf_hook_slow+0x74/0x130
  Aug 26 07:57:27 test-osad kernel: [ 4695.687477]  [<ffffffff816e7cf0>] ? ip_fragment+0x8a0/0x8a0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687479]  [<ffffffff816e6bc0>] ? ip_forward_options+0x1c0/0x1c0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687481]  [<ffffffff816e9952>] ip_output+0x92/0xa0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687484]  [<ffffffff816e909a>] ? __ip_local_out+0xaa/0xb0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687486]  [<ffffffff816e90d0>] ip_local_out_sk+0x30/0x40
  Aug 26 07:57:27 test-osad kernel: [ 4695.687488]  [<ffffffff816e9449>] ip_queue_xmit+0x149/0x3d0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687491]  [<ffffffff81700d9a>] tcp_transmit_skb+0x4aa/0x950
  Aug 26 07:57:27 test-osad kernel: [ 4695.687494]  [<ffffffff817013c2>] tcp_write_xmit+0x182/0xd10
  Aug 26 07:57:27 test-osad kernel: [ 4695.687497]  [<ffffffff817021c2>] __tcp_push_pending_frames+0x32/0xd0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687500]  [<ffffffff816f0e6f>] tcp_push+0xef/0x120
  Aug 26 07:57:27 test-osad kernel: [ 4695.687502]  [<ffffffff816f4659>] tcp_sendmsg+0xb9/0xc60
  Aug 26 07:57:27 test-osad kernel: [ 4695.687507]  [<ffffffff8171ec93>] inet_sendmsg+0x63/0xb0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687512]  [<ffffffff81347471>] ? apparmor_socket_sendmsg+0x21/0x30
  Aug 26 07:57:27 test-osad kernel: [ 4695.687515]  [<ffffffff8168dbe7>] sock_aio_write+0x117/0x140
  Aug 26 07:57:27 test-osad kernel: [ 4695.687520]  [<ffffffff811ebaaa>] do_sync_write+0x5a/0x90
  Aug 26 07:57:27 test-osad kernel: [ 4695.687524]  [<ffffffff811ec515>] vfs_write+0x195/0x1f0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687527]  [<ffffffff811ecf2e>] ? vfs_read+0x11e/0x140
  Aug 26 07:57:27 test-osad kernel: [ 4695.687530]  [<ffffffff811ed046>] SyS_write+0x46/0xb0
  Aug 26 07:57:27 test-osad kernel: [ 4695.687534]  [<ffffffff810df111>] ? posix_ktime_get_ts+0x11/0x20
  Aug 26 07:57:27 test-osad kernel: [ 4695.687537]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b
  Aug 26 07:57:27 test-osad kernel: [ 4695.687540] ---[ end trace 17da8a026eae9b77 ]---

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