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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Of course, after stating that I will look for a instance that is not
affected, all of which I start are on the same cpu type and affected. :/
>From further research it sounds like Xen 3.4.3 has a default of running
guests in native tsc mode while Xen 4.0 and later have a default of
native if the tsc is stable and emulated otherwise. I played around with
the local host but could get no difference even if forcing native tsc
mode. One thing I noticed then was that while on dom0 I have nonstop_tsc
in the /proc/cpuinfo, it does not show up in my PV guest. Somehow we see
it on AWS. Locally I am using Xen 4.4 though.

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https://bugs.launchpad.net/bugs/1349883

Title:
  dmesg time wildly incorrect on paravirtual EC2 instances.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu 14.04 EC2 instances, during startup the dmesg time goes from
  0 seconds to thousands of seconds. This causes kernel logs to be
  recorded for months in the future.

  This appears to be related to the kernel trusting the TSC clock on Xen servers, as described here:
  https://forums.aws.amazon.com/thread.jspa?threadID=59753

  But I am not sure that is the cause.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jul 29 14:41 seq
   crw-rw---- 1 root audio 116, 33 Jul 29 14:41 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  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: 'iw'
  CurrentDmesg: [7562292.301737] init: plymouth-upstart-bridge main process ended, respawning
  Date: Tue Jul 29 14:47:54 2014
  Ec2AMI: ami-00dc1368
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-east-1c
  Ec2InstanceType: m1.small
  Ec2Kernel: aki-919dcaf8
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci:
   
  Lsusb: Error: [Errno 2] No such file or directory: 'lsusb'
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jul 29 14:41 seq
   crw-rw---- 1 root audio 116, 33 Jul 29 14:41 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.2
  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: [7562292.301737] init: plymouth-upstart-bridge main process ended, respawning
  DistroRelease: Ubuntu 14.04
  Ec2AMI: ami-00dc1368
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-east-1c
  Ec2InstanceType: m1.small
  Ec2Kernel: aki-919dcaf8
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci:
   
  Lsusb: Error: [Errno 2] No such file or directory
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty ec2-images
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin ssh sudo
  WifiSyslog:
   
  _MarkForUpload: True

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