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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: performing-bisect

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https://bugs.launchpad.net/bugs/1251035

Title:
  kernel stack trace when running openvswitch DEP-8 tests

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The DEP-8 test exercises the openvswitch userspace and kernel module
  by setting up to bridges, connecting 7 'hosts' to each bridge,
  patching the bridges together and then running performance and ping
  tests between hosts on different bridges.

  The stack trace occurs on teardown of the bridges/switches.

  [  426.965530] ------------[ cut here ]------------
  [  426.965538] WARNING: CPU: 2 PID: 16575 at /build/buildd/linux-3.12.0/net/core/dev.c:5319 rollback_registered_many+0x219/0x250()
  [  426.965540] Modules linked in: openvswitch vxlan ip_tunnel(F) gre(F) libcrc32c(F) veth(F) hid_generic usbhid hid xt_conntrack(F) ipt_REJECT(F) xt_CHECKSUM(F) iptable_mangle(F) xt_tcpudp(F) ip6table_filter(F) ip6_tables(F) iptable_filter(F) ebtable_nat(F) ebtables(F) dm_crypt(F) ipt_MASQUERADE(F) iptable_nat(F) nf_conntrack_ipv4(F) nf_defrag_ipv4(F) nf_nat_ipv4(F) nf_nat(F) nf_conntrack(F) ip_tables(F) x_tables(F) bridge(F) stp(F) llc(F) joydev(F) x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel(F) kvm(F) crct10dif_pclmul(F) crc32_pclmul(F) ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) lrw(F) gf128mul(F) glue_helper(F) ablk_helper(F) cryptd(F) arc4(F) parport_pc(F) iwldvm ppdev(F) snd_hda_codec_hdmi mac80211 snd_hda_codec_realtek uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb microcode(F) snd_hda_intel snd_hda_codec iwlwifi snd_hwdep(F) psmouse(F) thinkpad_acpi snd_pcm(F) serio_raw(F) nvram(F) cfg80211 snd_seq_midi(F) lpc_ich snd_seq_midi_event(F) snd_rawmidi(F) bnep snd_seq(F) rfcomm snd_page_alloc(F) snd_seq_device(F) snd_timer(F) bluetooth snd(F) soundcore(F) tpm_tis mac_hid mei_me mei lp(F) parport(F) nls_iso8859_1(F) i915 i2c_algo_bit drm_kms_helper drm sdhci_pci ahci(F) libahci(F) sdhci e1000e(F) ptp(F) pps_core(F) wmi video(F) [last unloaded: ip_tunnel]
  [  426.965609] CPU: 2 PID: 16575 Comm: ip Tainted: GF       W    3.12.0-2-generic #7-Ubuntu
  [  426.965610] Hardware name: LENOVO 2324CTO/2324CTO, BIOS G2ET91WW (2.51 ) 01/14/2013
  [  426.965612]  0000000000000009 ffff8803ba8bd8e8 ffffffff8170feef 0000000000000000
  [  426.965616]  ffff8803ba8bd920 ffffffff8106430d ffff8803d0dd9000 ffff8803ba8bd918
  [  426.965618]  ffff8803ba8bd988 0000000000000000 ffffffff81cd5f80 ffff8803ba8bd930
  [  426.965621] Call Trace:
  [  426.965627]  [<ffffffff8170feef>] dump_stack+0x45/0x56
  [  426.965631]  [<ffffffff8106430d>] warn_slowpath_common+0x7d/0xa0
  [  426.965634]  [<ffffffff810643ea>] warn_slowpath_null+0x1a/0x20
  [  426.965637]  [<ffffffff81612d09>] rollback_registered_many+0x219/0x250
  [  426.965640]  [<ffffffff81612d97>] unregister_netdevice_many+0x17/0x70
  [  426.965644]  [<ffffffff81626f0f>] rtnl_dellink+0xbf/0x130
  [  426.965647]  [<ffffffff81624259>] rtnetlink_rcv_msg+0x99/0x260
  [  426.965651]  [<ffffffff8119b068>] ? __kmalloc_node_track_caller+0x58/0x1e0
  [  426.965654]  [<ffffffff81197f11>] ? kmem_cache_alloc+0x31/0x140
  [  426.965658]  [<ffffffff81606bae>] ? __alloc_skb+0x7e/0x2b0
  [  426.965660]  [<ffffffff816241c0>] ? rtnetlink_rcv+0x30/0x30
  [  426.965664]  [<ffffffff81642749>] netlink_rcv_skb+0xa9/0xc0
  [  426.965667]  [<ffffffff816241b8>] rtnetlink_rcv+0x28/0x30
  [  426.965670]  [<ffffffff81641d9d>] netlink_unicast+0xdd/0x190
  [  426.965673]  [<ffffffff8137e06d>] ? memcpy_fromiovec+0x4d/0x90
  [  426.965676]  [<ffffffff8164214f>] netlink_sendmsg+0x2ff/0x740
  [  426.965679]  [<ffffffff815fe63b>] sock_sendmsg+0x8b/0xc0
  [  426.965683]  [<ffffffff8117b278>] ? page_add_new_anon_rmap+0xd8/0x170
  [  426.965686]  [<ffffffff815fe32e>] ? move_addr_to_kernel.part.14+0x1e/0x60
  [  426.965689]  [<ffffffff815feef1>] ? move_addr_to_kernel+0x21/0x30
  [  426.965692]  [<ffffffff815feeb8>] ___sys_sendmsg+0x3b8/0x3d0
  [  426.965695]  [<ffffffff8117112c>] ? handle_mm_fault+0x36c/0x750
  [  426.965699]  [<ffffffff8171c0bc>] ? __do_page_fault+0x21c/0x560
  [  426.965704]  [<ffffffff8110aeac>] ? acct_account_cputime+0x1c/0x20
  [  426.965707]  [<ffffffff8109b86b>] ? account_user_time+0x8b/0xa0
  [  426.965710]  [<ffffffff815ff5c2>] __sys_sendmsg+0x42/0x80
  [  426.965713]  [<ffffffff815ff612>] SyS_sendmsg+0x12/0x20
  [  426.965716]  [<ffffffff81720d3f>] tracesys+0xe1/0xe6
  [  426.965718] ---[ end trace 82879f5d4f934596 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-generic 3.12.0.2.4
  ProcVersionSignature: Ubuntu 3.12.0-2.7-generic 3.12.0
  Uname: Linux 3.12.0-2-generic x86_64
  ApportVersion: 2.12.6-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jamespage   2869 F.... pulseaudio
  Date: Wed Nov 13 21:26:50 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=9cabca8b-d2e3-4f65-a113-3c165c5ecbc6
  InstallationDate: Installed on 2013-04-23 (204 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423)
  MachineType: LENOVO 2324CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-2-generic.efi.signed root=UUID=88b94abf-33eb-4e05-888d-9dacbe025054 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-2-generic N/A
   linux-backports-modules-3.12.0-2-generic  N/A
   linux-firmware                            1.117
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-11-11 (2 days ago)
  dmi.bios.date: 01/14/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET91WW (2.51 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2324CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET91WW(2.51):bd01/14/2013:svnLENOVO:pn2324CTO:pvrThinkPadX230:rvnLENOVO:rn2324CTO:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2324CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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