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[Ron <1208532@xxxxxxxxxxxxxxxxxx>]

I also experienced this issue within 4 hours of a host upgrade to kernel
3.8.0-27 yesterday, and migrating ~16 guests in.

There were two observed guest types which lost networking: Ubuntu 12.10
Quantal, and Ubuntu 10.04 Lucid LTS.  Rebooting guest was the only way
to re-establish bridged network connection to the guests.  brctl
outputs, ifconfig, and virsh commands all looked proper, and matched
working Guests.  No errors in host or guest syslogs, or consoles.

On the final frozen guest, this morning, we attempted to migrate a
network-down guest OS to an IDENTICAL hardware+3.8.0-27 kernel host in
hopes of magically regaining networking; and the source host kernel-
panicked and froze!  Sadly the console display size was too small to see
the source of Panic, nor was detail logged to the syslog.  We did see a
lot of net-tx/rx detail in the stack listing.

We hard-booted this panicked host into previous, 3.8.0-26 kernel, 4
hours uptime and no guest connectivity loss (yet?).

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https://bugs.launchpad.net/bugs/1208532

Title:
  put_page failures with 3.8.0-27.40

Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  Since update to 3.8.0-27.40 kernel I have been seeing these errors on
  an almost daily basis. I run two Windows Server 2012 instances under
  KVM. One or both of the Windows instances will disconnect from the
  network when this error happens and will not reconnect until I reboot
  Windows. Linux seems to recover silently on its own.

  Running on an HP Z600 Workstation with ECC RAM (memory issue is very
  unlikely). Scanned the boot/swap HDD for errors with Seagate SeaTools,
  no issues found.

  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
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  greg       3352 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Mon Aug  5 09:44:31 2013
  HibernationDevice: RESUME=UUID=94c635e6-8245-4fe1-8c93-432c8d10dbd1
  InstallationDate: Installed on 2012-02-14 (538 days ago)
  InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  MachineType: Hewlett-Packard HP Z600 Workstation
  MarkForUpload: True
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-27-generic root=/dev/mapper/mizuno-root ro
  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
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-25 (101 days ago)
  dmi.bios.date: 11/02/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786G4 v03.54
  dmi.board.asset.tag: 2UA00605JK
  dmi.board.name: 0AE8h
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: C
  dmi.chassis.asset.tag: 2UA00605JK
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr786G4v03.54:bd11/02/2011:svnHewlett-Packard:pnHPZ600Workstation:pvr:rvnHewlett-Packard:rn0AE8h:rvrC:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Z600 Workstation
  dmi.sys.vendor: Hewlett-Packard

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