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[Launchpad Bug Tracker <1315669@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Kernel Panic caused by pulseaudio
https://bugs.launchpad.net/bugs/1315669
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