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

[Kirk Bocek]

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