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[Uli Middelberg <uli@xxxxxxxxxxxxx>]

v3.13-rc3: doesn't exhibit this bug
v3.13-rc6: exhibits this bug

I'll try v3.13-rc4 and v3.13-rc5 next, but http://kernel.ubuntu.com
/~kernel-ppa/mainline/v3.13-rc4-trusty/ seems to be incomplete

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https://bugs.launchpad.net/bugs/1356558

Title:
  BUG: soft lockup - CPU stuck for 22s! [md3_raid1]

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  this bug appeared in Ubuntu 14.04, Ubuntu 12.04 didn't show this behavior. 
  I've found a possible predecessor in bug #212684.
  Switching to a recent mainline kernel didn't fix this issue.

  Starting

   $ /usr/share/mdadm/checkarray /dev/md3

  will repeat this behavior.

  /dev/md3 is a LVM PV:

    --- Physical volume ---
    PV Name               /dev/md3
    VG Name               local_vg1
    PV Size               1.36 TiB / not usable 2.25 MiB
    Allocatable           yes 
    PE Size               4.00 MiB
    Total PE              355619
    Free PE               31011
    Allocated PE          324608

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-33-generic 3.13.0-33.58
  ProcVersionSignature: Ubuntu 3.13.0-33.58-generic 3.13.11.4
  Uname: Linux 3.13.0-33-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-33-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  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/pcmC0D1p', '/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'
  Date: Wed Aug 13 21:42:12 2014
  HibernationDevice: RESUME=UUID=c4a03c5e-f650-4ca8-9dab-f0c4ad12c901
  InstallationDate: Installed on 2014-07-06 (37 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
  IwConfig:
   lo        no wireless extensions.
   
   em1       no wireless extensions.
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-33-generic root=UUID=9c2715cb-dd8a-4687-9537-009e1e4e83d8 ro nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-33-generic N/A
   linux-backports-modules-3.13.0-33-generic  N/A
   linux-firmware                             1.127.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/19/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: JT94510H.86A.0045.2010.0519.1750
  dmi.board.name: D945GSEJT
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE57850-300
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrJT94510H.86A.0045.2010.0519.1750:bd05/19/2010:svn:pn:pvr:rvnIntelCorporation:rnD945GSEJT:rvrAAE57850-300:cvn:ct3:cvr:

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