Thanks for your answer and sorry for the late feedback. This weird bug/panic disappeared after switching from nonfree Catalyst to free radeon driver. Even when using Catalyst again, the bug does not reappear. So Dave seems to be right, thanks for the pointers. However I still don't understand the link with pulseaudio etc. Obiously some voodoo involved here, therefore this bug can be marked as invalid.
Thanks. rooots -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1315669 Title: Kernel Panic caused by pulseaudio Status in “linux” package in Ubuntu: Incomplete 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315669/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
