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[Joost Ringoot <joost@xxxxxxxxxxx>]

I think the latest kernel update resolved this bug. 
(pulseaudio is still version 6.0)

** Changed in: linux (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1504349

Title:
  GUI crash when starting secondary sound, or changing track

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  tested both with rythmbox and clementine: GUI crashes (unity/lightdm and gnome/gdm same issue) when trying to switch audiotrack. Well it hangs, mousepointer inclusive and tty's via ALT+F? are no longer accessable
  Computer is (sometimes) still accessable remotely via ssh but to not much use. 
  I suspect it is pulse-audio related, the process shows defunct status after crash.
  computer behaves extremely buggy until hard reboot or "halt --reboot", "init 6" and "reboot" don't seem to work.

  
  # cat /proc/version_signature
  Ubuntu 3.19.0-31.35-generic 3.19.8-ckt7

  lsb_release -rd
  Description:	Ubuntu 15.04
  Release:	15.04

  3) switch audio-track
  4) kernel-crash (linux-image-3.19.0-31-generic.188915.crash)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-31-generic 3.19.0-31.35
  ProcVersionSignature: Ubuntu 3.19.0-31.35-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jringoot   1721 F.... pulseaudio
   /dev/snd/controlC1:  jringoot   1721 F.... pulseaudio
  Date: Fri Oct  9 01:20:25 2015
  HibernationDevice: RESUME=UUID=7f097a7b-7fce-41a7-b16f-fa23bddb5aa9
  InstallationDate: Installed on 2015-06-05 (125 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-31-generic root=UUID=cf56b035-021e-453d-8216-67c6c02bb956 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-31-generic N/A
   linux-backports-modules-3.19.0-31-generic  N/A
   linux-firmware                             1.143.4
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/30/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1238
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5B-Deluxe
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1238:bd09/30/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5B-Deluxe:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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