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[Launchpad Bug Tracker <1315669@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1315669

Title:
  Kernel Panic caused by pulseaudio

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Happens with:

  OS: Ubuntu 14.04 LTS, Gnome-Flashback
  Kernels: 3.13.0, 3.13.11, 3.14.1, 3.15.0
  Pulseaudio: 1:4.0-0ubuntu11

  Mainboard: Gigabyte GA-Z77X-UD3H
  Audio: Onboard VIA VT2021

  Does NOT happen with same hardware and Ubuntu 12.04.4, Kernels 3.12.13
  and earlier.

  Symptoms:

  (1) Greeter / Login screen unresponsive for 5..10s,
  (2) After logon, desktop unresponsive for 5..60s before panels etc. show up and mouse pointer appears,
  (3) (1) and (2) occasionally accompanied by Pulseaudio causing up to 100% CPU load
  (4) Kernel panic at shutdown/restart or when attempting to kill pulseaudio

  (1) and (2) happen approx. 8 out of 10 times. switching to tty while
  desktop is unresponsive, top shows high cpu load for pulseaudio. kill
  -9 of pulseaudio causes kernel panic in most of the cases. Also,
  "pulseaudio -k" causes kernel panic. Kernel panic also occurs on each
  system shutdown/restart.

  When deactivating onboard sound in BIOS, (1)-(3) do not occur, but (4)
  still happens.

  After removing pulseaudio (incl. associated packages) via apt-get, all of the above symptoms are gone.
  Switching kernels makes no difference. Ubuntu 12.04.4 (Kernels 3.12.13 and earlier, pulseaudio 1:1.1-0ubuntu15.4) is running fine on the same hardware.

  I've attached a camera screenshot of one of the panics. Please let me
  know how I can help debugging this issue.

  lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  apt-cache policy pulseaudio
  pulseaudio:
    Installed: 1:4.0-0ubuntu11
    Candidate: 1:4.0-0ubuntu11
    Version table:
   *** 1:4.0-0ubuntu11 0
          500 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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