Red Hat Bugzilla – Bug 513785
pulseaudio cause system to freeze
Last modified: 2010-06-28 09:49:29 EDT
Created attachment 355159 [details]
Output from pulseaudio right before system halted.
Description of problem:
My system freezes when watching a low-quality video clip from vlc. By setting an audio output to dummy device the playback works fine. Setting only a video output to dummy still halts the system while playing a video clip. High quality audio/video seems have only minor skipping problems, no system freeze.
Version-Release number of selected component (if applicable):
Usually by playing some low quality audio in vlc. Typically ~10 seconds is enough. Sometimes several minutes is required. Seeking the stream while playing usually halts the system quite fast.
Clip plays for few seconds or minutes. Sound is very choppy and clicky at beginning. Sometimes the audio goes silent some seconds before the system halts.
Clip plays smoothly without clicking nor system freeze.
When system freezes only which seems to have any visible effect is alt-SysRq-b. Mouse cursor doesn't move. Log files don't contain anything unusual.
lspci -nn -x:
00:1b.0 Audio device : Intel Corporation 82801H (ICH8 Family) HD Audio Controller [8086:284b] (rev 03)
Subsystem: Inventec Corporation Device [1170:0040]
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at f0500000 (64-bit, non-prefetchable) [size=16K]
Capabilities:  Power Management version 2
Capabilities:  MSI: Mask- 64bit+ Count=1/1 Enable-
Capabilities:  Express Root Complex Integrated Endpoint, MSI 00
Capabilities:  Virtual Channel <?>
Capabilities:  Root Complex Link <?>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
Attaching output from pulseaudio -vvvvv from a playback session causing a system freeze.
Setting audio output to alsa from vlc and playback works just superb.
Are you using PA in RT mode? (If you don't know then you dont)
AFAIK I am not running PA in real-time mode. This just a default F11 install.
$ pulseaudio -vvvv 2>&1 | grep pulse-rt
I: main.c: We are not in group 'pulse-rt', PolicyKit refuse to grant us the requested privileges and we have no increase RLIMIT_NICE/RLIMIT_RTPRIO resource limits.
I: main.c: For enabling real-time/high-priority scheduling please acquire the appropriate PolicyKit privileges, or become a member of 'pulse-rt', or increase the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user.
Then we have a kernel problem here, because under no circumstances PA -- as a normal userspace process -- should be able to make the machine freeze.
Do your caps/num LEDs blink when the machine freezes like this?
No, the kernel doesn't panic. I've tried roughly ten times to get any useful error messages out of the system before it dies.
I've tried different alt-sysrq combos to get some log messages but its like the the whole system is zapped instantly with kill -9. Nothing works, not even the caps lock. Although the alt-sysrq-b makes the system to boot...
I could try to setup netconsole to see if has better changes to capture something useful. Let me know if I should give it a try.
fwiw, # cat /proc/sys/kernel/tainted
This message is a reminder that Fedora 11 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 11. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '11'.
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plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 11's end of life.
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Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 is
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