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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I'm attempting to reproduce this bug, but have not been able to yet.

Does the panic happen every time you run the dd example?  Also, did this
issue happen with prior kernels or is it new with the 3.13.0-68 kernel?

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https://bugs.launchpad.net/bugs/1515828

Title:
  system lockup, console logs kernel BUG at /build/linux-lts-trusty-
  HlNG0J/linux-lts-trusty-3.13.0/kernel/hrtimer.c:1310

Status in linux-lts-trusty package in Ubuntu:
  Triaged

Bug description:
  Reproducible by trying to do any non-trivial amount of I/O to one of
  the installed SSDs, e.g.: dd if=/dev/sdb of=/dev/null bs=1024k

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-68-generic 3.13.0-68.111~precise1
  ProcVersionSignature: Ubuntu 3.13.0-68.111~precise1-generic 3.13.11-ckt27
  Uname: Linux 3.13.0-68-generic x86_64
  ApportVersion: 2.12-0ubuntu2~0.IS.12.04.1
  Architecture: amd64
  Date: Fri Nov 13 01:16:14 2015
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)

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