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[Bogdan <bogdar@xxxxxxxxx>]

Hello all,

I have probably same issue (freeze on Xenserver 6.5 with timekeeper.c in
backtrace) when unsuspending 14.04 VMs with 3.19 kernels.

To determine latest stable kernel version I've tested following versions
of kernel package:


linux-image-3.19.0-56-generic - Unsuspend works, XenMotion - not tested
linux-image-3.19.0-58-generic - Unsuspend works, XenMotion - works
linux-image-3.19.0-59-generic - Unsuspend causes kernel panic with timekeeper.c, Xenmotion - kernel panic 
linux-image-3.19.0-61-generic - Unsuspend causes kernel panic with timekeeper.c, Xenmotion - kernel panic 

We have some Ubuntu systems in production with 3.19.0-61 and can't
maintain our hypervisors well because it is not possible neither move
Ubuntu VM out of server nor suspend for maintenance time.

Tested on two pairs of Xenserver systems:

pair#1 - updates up to XS65ESP1023
pair#2 - updates up to XS65ESP1026 and XS65ESP1028


Please, let me know if I can give more information of test some fix.

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https://bugs.launchpad.net/bugs/1593621

Title:
  Kernel panic after migration between XenServer 6.5 hosts

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Problem: after live migration from one XenServer 6.5 server to another
  XenServer 6.5 the Ubuntu VM crashes (see attached screenshot).

  Affected verions (at least):
  1. Ubuntu 14.04 (3.19.0-61-generic)
  2. Ubuntu 16.04 (4.4.0-24-generic)

  Not affected versions:
  1.Ubuntu 14.04 (3.19.0-49-generic)

  The issue is not dependent on installed XenServer updates.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jun 16 11:23 seq
   crw-rw---- 1 root audio 116, 33 Jun 16 11:23 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg: [   69.046113] nf_conntrack version 0.5.0 (7868 buckets, 31472 max)
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=250f9548-2a14-41c1-bc6e-63199d6e9236
  InstallationDate: Installed on 2016-02-02 (136 days ago)
  InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  IwConfig:
   lo        no wireless extensions.
   
   eth1      no wireless extensions.
   
   eth0      no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Xen HVM domU
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-61-generic root=UUID=5a4cba3d-3be6-4a07-9c55-d5ea7b52585e ro ipv6.disable=1 net.ifnames=0 biosdevname=0
  ProcVersionSignature: Ubuntu 3.19.0-61.69~14.04.1-generic 3.19.8-ckt21
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-61-generic N/A
   linux-backports-modules-3.19.0-61-generic  N/A
   linux-firmware                             1.127.22
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.19.0-61-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 05/11/2016
  dmi.bios.vendor: Xen
  dmi.bios.version: 4.4.1-xs125381
  dmi.chassis.type: 1
  dmi.chassis.vendor: Xen
  dmi.modalias: dmi:bvnXen:bvr4.4.1-xs125381:bd05/11/2016:svnXen:pnHVMdomU:pvr4.4.1-xs125381:cvnXen:ct1:cvr:
  dmi.product.name: HVM domU
  dmi.product.version: 4.4.1-xs125381
  dmi.sys.vendor: Xen

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