[Bug 885170] Re: VM Guests Hang While Rebooting Due to KVM Clock Bug

[Herton R. Krzesinski]

*** This bug is a duplicate of bug 795717 ***
    https://bugs.launchpad.net/bugs/795717

@nutznboltz: I'm including the patch again into natty, and probably we
will have a new kernel for you to verify next week. I'm marking this bug
as duplicate of the original one (bug 795717). Make sure you follow that
bug, a new request for verification will be made there. Once the kernel
with the fix is in -proposed, I'll send again a message on that bug
requesting the kernel to be verified (tested) to fix the problem. If
it's not tested, the patch will be reverted again.

** This bug has been marked a duplicate of bug 795717
   32bit rhel and centos 5.(5|6) hangs on boot on natty

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https://bugs.launchpad.net/bugs/885170

Title:
  VM Guests Hang While Rebooting Due to KVM Clock Bug

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  SRU Justification:

  Impact: Various Qemu/KVM guests hang while attempting to reboot due to
  a missing kvm clock kernel patch.

  Testcase:  Some guests are more susceptible to this issue.  A 32-bit
  RHEL-5 (or compatible) 2-CPU VM guest hangs 100% of the time (fully
  reproducible.)  I have personally seen Ubuntu VM guests hang too but
  this is much harder to reproduce.

  Fix: A one line patch from 2.6.39

  diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
  index 980317a..0556e05 100644
  --- a/arch/x86/kvm/x86.c
  +++ b/arch/x86/kvm/x86.c
  @@ -2100,8 +2100,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
     if (check_tsc_unstable()) {
      kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
      vcpu->arch.tsc_catchup = 1;
  - kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
     }
  + kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
     if (vcpu->cpu != cpu)
      kvm_migrate_timers(vcpu);
     vcpu->cpu = cpu;

  This is a resubmission of LP: #795717

  See also http://patchwork.ozlabs.org/patch/109436/

  See also LP: #882579

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image-2.6.38-12-generic 2.6.38-12.51
  ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
  Uname: Linux 2.6.38-12-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: SB [HDA ATI SB], device 0: ALC892 Analog [ALC892 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ksta       2106 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfe4f4000 irq 16'
     Mixer name	: 'Realtek ALC892'
     Components	: 'HDA:10ec0892,104383c0,00100302'
     Controls      : 32
     Simple ctrls  : 18
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfe6e8000 irq 19'
     Mixer name	: 'ATI RS690/780 HDMI'
     Components	: 'HDA:1002791a,00791a00,00100000'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Wed Nov  2 07:54:16 2011
  HibernationDevice: RESUME=UUID=d12bbb7b-b9a4-425c-86a7-c50665bf7833
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.

   virbr0    no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-12-generic root=/dev/mapper/vg0-lv0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-12-generic N/A
   linux-backports-modules-2.6.38-12-generic  N/A
   linux-firmware                             1.52
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to natty on 2011-05-26 (159 days ago)
  dmi.bios.date: 08/24/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1606
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A89GTD-PRO/USB3
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1606:bd08/24/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A89GTD-PRO/USB3:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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