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[Bug 1381612] [NEW] Hangs with 1 CPU fully utilised after long period of suspend

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Public bug reported:

Running 14.04 LTS Server in a virtual machine on a 14.04 LTS Desktop
host.

When the guest suspends for a long period of time the guest server
becomes unresponsive in both Virtual Machine Viewer and over SSH, with
100% of one CPU core utilised.

A hard reset of the guest is required.

The last entry in kern.log on the 14.04 guest seems to be the
Clocksource complaint, the entry at 16:40 was the first entry following
the hard reset:

Oct 14 22:16:18 syncthing kernel: [   76.145297] random: nonblocking pool is initialized
Oct 14 22:23:12 syncthing kernel: [  489.632956] Clocksource tsc unstable (delta = -2976366996 ns)
Oct 15 16:40:11 syncthing kernel: [    0.000000] Initializing cgroup subsys cpuset

This was left overnight, but it's more typical for the machine to be
suspended for a few hours, which still causes the problem.

I have many other 12.04 LTS Server guests that work just fine regardless
of how long they are left suspended so this appears to be a regression.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-37-generic 3.13.0-37.64
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-37-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
CurrentDmesg: [    9.605618] random: nonblocking pool is initialized
Date: Wed Oct 15 16:49:06 2014
HibernationDevice: RESUME=/dev/mapper/ubuntu--1404--vg-swap_1
InstallationDate: Installed on 2014-10-13 (1 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-37-generic root=/dev/mapper/ubuntu--1404--vg-root ro
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-37-generic N/A
 linux-backports-modules-3.13.0-37-generic  N/A
 linux-firmware                             1.127.7
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/01/2011
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-trusty:cvnBochs:ct1:cvr:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-trusty
dmi.sys.vendor: QEMU

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug trusty

-- 
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https://bugs.launchpad.net/bugs/1381612

Title:
  Hangs with 1 CPU fully utilised after long period of suspend

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Running 14.04 LTS Server in a virtual machine on a 14.04 LTS Desktop
  host.

  When the guest suspends for a long period of time the guest server
  becomes unresponsive in both Virtual Machine Viewer and over SSH, with
  100% of one CPU core utilised.

  A hard reset of the guest is required.

  The last entry in kern.log on the 14.04 guest seems to be the
  Clocksource complaint, the entry at 16:40 was the first entry
  following the hard reset:

  Oct 14 22:16:18 syncthing kernel: [   76.145297] random: nonblocking pool is initialized
  Oct 14 22:23:12 syncthing kernel: [  489.632956] Clocksource tsc unstable (delta = -2976366996 ns)
  Oct 15 16:40:11 syncthing kernel: [    0.000000] Initializing cgroup subsys cpuset

  This was left overnight, but it's more typical for the machine to be
  suspended for a few hours, which still causes the problem.

  I have many other 12.04 LTS Server guests that work just fine
  regardless of how long they are left suspended so this appears to be a
  regression.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-37-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  CurrentDmesg: [    9.605618] random: nonblocking pool is initialized
  Date: Wed Oct 15 16:49:06 2014
  HibernationDevice: RESUME=/dev/mapper/ubuntu--1404--vg-swap_1
  InstallationDate: Installed on 2014-10-13 (1 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-37-generic root=/dev/mapper/ubuntu--1404--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-trusty:cvnBochs:ct1:cvr:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-trusty
  dmi.sys.vendor: QEMU

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