[vdr] VDR crash freezing computer !

Niko Mikkila nm at phnet.fi
Thu Nov 3 13:59:53 CET 2005


On Thu, 03 Nov 2005 11:37:17 +0100
michaelip at free.fr wrote:

> Hello.
> 
> Often when starting my computer, vdr crashes without any specific reason and
> freezes the computer ! Nothing is possible/available on my comnputer ! I just
> have to reset it !
> 
> Looking at syslog files, I have a long list of kernel PREEMPT, the last one
> freezing the computer !
> 
> Most of this PREMPT finishes with the following line:
> Nov  3 07:18:39 localhost kernel:  <1>Unable to handle kernel NULL pointer
> dereference at virtual address 00000020
> 
> The first PREMPT occurs after a problem on DXR3 card !
> 
> Nov  3 07:18:23 localhost vdr[3105]: dxr3: fatal: microcode upload failed: Timer
> expired
> Nov  3 07:18:23 localhost kernel: em8300: DICOM Update failed
> Nov  3 07:18:23 localhost kernel: em8300_video.c: Video Fifo timeout
> Nov  3 07:18:23 localhost vdr[2470]: dxr3: resuscitation: device failure or user
> initiated reset
> 
> I have a long list of call traces... It seems that problems cames from a badly
> managed page fault !
> 
> I don't know what to do... Does anyone have a suggestion of what I could do in
> order to avoid this ? What could I look in the syslog also ?
> 
> Many thanks for any help.
> 
> 
>    Michael
> 

The PREEMPT messages suggest that you have kernel preemption enabled.
That may be a bad idea with Dxr3, so try to compile a new kernel without it.

If that doesn't help, check that Dxr3 doesn't share interrupts with any other
device (cat /proc/interrupts). Then you could add some delays to the scripts
so that the card has enough time to initialize properly. It is best to load
the dxr3 stuff in some script using modprobe with "sleep 2" after the module
loading and also after the microcode setup.

--
Niko Mikkilä



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