[mythtv-users] Mythbackend Crashes While Changing Channels on HD-5500

[Chris Weiland]

I think there were some kernel bugs regarding the 5500, which didn't get
solved until 2.6.20.  I know that in 2.6.19, the signal strength was bugged
and always showed 0, so it's not unlikely that there were some other bugs in
previous kernel versions that are giving you problems.

As for mythbackend crashing, I don't know.  It could be related to the
theoretical bugged kernel drivers though.  I've had mythbackend crash on me
for not too different reasons (which were my fault).

On 2/20/07, Kirk Bocek <t004 at kbocek.com> wrote:
>
> I thought I'd give this one more shot here. I'm really at a loss with this
> crash problem. Any suggestions would be greatly appreciated -- thanks.
>
> I'm trying to get my first distributed frontend/backend MythTV setup
> working
> and I'm having stability problems with mythbackend and the PcHDTV HD-5500.
>
> My setup is an SMP server running kernel 2.6.18.6 with a single HD-5500,
> mythbackend and MySQL. I've got a single mythfrontend-only box driving a
> 1680x1050 widescreen PC display using a Geforce 6200 and the nvidia binary
> drivers.
>
> After playing with the profiles, I've got the backend making recordings
> that
> play just fine on the frontend, both SD/analog and HD/Digital channels
> from my
> cable system.
>
> But once I start watching live TV and then start switching channels:
>    --audio sometimes drops out
>    --mythfrontend displays "Error was encountered while displaying video."
> and             kicks me out of live TV
>    --I start to see "NVR: Only read -1 bytes of 8192 bytes from '/dev/dsp
>         read audio: Input/output error" in the mytbackend logs
>    --I start to see things like "cx88[0]: irq aud [0x1001] dn_risci1*
> dn_sync*
>         cx88[0]/1: clearing mask" on the mythbackend console
>
> Mythbackend eventually segfaults:
> mythbackend[5812]: segfault at 00002aaaaac00000 rip 0000003da5271f9a rsp
> 000000004680ac98 error 7
>
> Leaving:
> $ps -ef |grep myth
> root      8101     1  0 Feb17 ?        00:00:01 [mythbackend] <defunct>
>
> And no amount of 'pkill -KILL' or '-HUP' or '-TERM' will remove the
> defunct
> mythbackend. The only thing that clears it is a (*gasp*) reboot!
>
> I'd really appreciate it if anyone can shed any light on this. My next
> stop is
>   linuxtv.org where it looks like they develop the cx88 (et al) drivers
> that
> power the HD-5500.
>
> Thanks,
> Kirk Bocek
>
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