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[Bug 1488815] Re: Kernel traces with skb_warn_bad_offload showing up during an AIO deployment on Ubuntu 14.04

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** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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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:
  New
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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