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[Seth Arnold <1207059@xxxxxxxxxxxxxxxxxx>]

This is reproducable without adding VMs nine and ten -- one or the other
of those VMs on its own is sufficient to kill my machine.

And this time, we got lucky, I have stack traces. I've trimmed my log to
show the crash up close, then the rest of a reboot.

** Summary changed:

- Eight KVM instances locked my machine
+ Specific KVM instances lock my machine

** Attachment added: "/var/log/kern.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1207059/+attachment/3756447/+files/kern.log

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https://bugs.launchpad.net/bugs/1207059

Title:
  Specific KVM instances lock my machine

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  With my linux-generic package at 3.8.0.27.45 I had a lockup while
  running eight KVM instances; the soundcard continued to loop the
  little tiny sample of audio it was on.

  The only lines that made it to /var/log/kern.log:

  Jul 31 11:11:18 hunt kernel: [10420.003674] device vnet2 entered promiscuous mode
  Jul 31 11:11:18 hunt kernel: [10420.007687] virbr0: topology change detected, propagating
  Jul 31 11:11:18 hunt kernel: [10420.007696] virbr0: port 3(vnet2) entered forwarding state
  Jul 31 11:11:18 hunt kernel: [10420.007719] virbr0: port 3(vnet2) entered forwarding state
  Jul 31 11:11:24 hunt kernel: [10425.644923] device vnet3 entered promiscuous mode
  Jul 31 11:11:24 hunt kernel: [10425.653002] virbr0: topology change detected, propagating
  Jul 31 11:11:24 hunt kernel: [10425.653006] virbr0: port 4(vnet3) entered forwarding state
  Jul 31 11:11:24 hunt kernel: [10425.653013] virbr0: port 4(vnet3) entered forwarding state
  Jul 31 11:11:30 hunt kernel: [10431.693359] device vnet4 entered promiscuous mode
  Jul 31 11:11:30 hunt kernel: [10431.703026] virbr0: topology change detected, propagating
  Jul 31 11:11:30 hunt kernel: [10431.703031] virbr0: port 5(vnet4) entered forwarding state
  Jul 31 11:11:30 hunt kernel: [10431.703038] virbr0: port 5(vnet4) entered forwarding state
  Jul 31 11:11:36 hunt kernel: [10437.649982] device vnet5 entered promiscuous mode
  Jul 31 11:11:36 hunt kernel: [10437.658017] virbr0: topology change detected, propagating
  Jul 31 11:11:36 hunt kernel: [10437.658022] virbr0: port 6(vnet5) entered forwarding state
  Jul 31 11:11:36 hunt kernel: [10437.658027] virbr0: port 6(vnet5) entered forwarding state
  Jul 31 11:11:38 hunt kernel: [10439.551771] kvm [8865]: vcpu0 disabled perfctr wrmsr: 0xc1 data 0xabcd
  Jul 31 11:11:42 hunt kernel: [10443.846061] device vnet6 entered promiscuous mode
  Jul 31 11:11:42 hunt kernel: [10443.850430] virbr0: topology change detected, propagating
  Jul 31 11:11:42 hunt kernel: [10443.850440] virbr0: port 7(vnet6) entered forwarding state
  Jul 31 11:11:42 hunt kernel: [10443.850489] virbr0: port 7(vnet6) entered forwarding state
  Jul 31 11:11:48 hunt kernel: [10449.515394] device vnet7 entered promiscuous mode
  Jul 31 11:11:48 hunt kernel: [10449.523544] virbr0: topology change detected, propagating
  Jul 31 11:11:48 hunt kernel: [10449.523549] virbr0: port 8(vnet7) entered forwarding state
  Jul 31 11:11:48 hunt kernel: [10449.523557] virbr0: port 8(vnet7) entered forwarding state
  Jul 31 11:11:50 hunt kernel: [10451.419931] kvm [9063]: vcpu0 disabled perfctr wrmsr: 0xc1 data 0xffff

  I've had ten or twelve KVM instances running before, it's a workload I
  know works.

  I was watching 'top' at the moment of the hang, and I still had over a
  gigabyte of cached and over a gigabyte of buffered memory available,
  so it wasn't as simple as running out of memory.

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-27-generic 3.8.0-27.40
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
  Uname: Linux 3.8.0-27-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sarnold    3023 F.... pulseaudio
  Date: Wed Jul 31 11:21:55 2013
  HibernationDevice: RESUME=UUID=81b2976f-2830-4449-9dae-e1d44a43fa78
  InstallationDate: Installed on 2012-10-18 (286 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: LENOVO 2359CTO
  MarkForUpload: True
  ProcEnviron:
   TERM=rxvt-unicode
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-27-generic root=UUID=7b8c2e1b-d2e6-47d9-9030-c078e9701a1d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-27-generic N/A
   linux-backports-modules-3.8.0-27-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-03-18 (135 days ago)
  dmi.bios.date: 09/13/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G4ET62WW (2.04 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2359CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2359CTO
  dmi.product.version: ThinkPad T530
  dmi.sys.vendor: LENOVO

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