[mythtv] Empty and missing recording files when making multiple simultaneous dvb recordings

[Roger James]

On 28/06/12 21:27, John Pilkington wrote:
>
> I posted yesterday about failure to populate the 'watch recordings' 
> screen, but I believe this could be another instance of the problem 
> above.  It looked as if my backend failed when asked to record four 
> dvb-t recordings simultaneously.  I hadn't seen this before.  There 
> had been lots of system changes, and I wondered if the tuner 
> identification had failed, so I tried running mythtvsetup.  None of 
> the tuners were recognised there, although dmesg showed that they had 
> been registered. I have gone back from kernel 3.4.2-1 to 3.3.7-1 in 
> fedora 16.x86_64 and mythtvsetup sees them again.  I didn't make any 
> changes there.  I'm using mythtv 0.24.3 build 283 from ATrpms dated 30 
> April.  I had made the kernel update earlier this week when a suitable 
> nvidia module became available at ATrpms.
John,

I am only seeing this particular problem since I moved to 0.25. Because 
it is a race condition  is not to say that it did not exist but with a 
lower probability in earlier versions. Because the backend ends up with 
two threads deadlocked it can produce some strange symptoms in any 
attached frontends. I have submitted a bug for it at 
http://code.mythtv.org/trac/ticket/10870. The work round is to set any 
DVB cards to only allow one simultaneous recording.

Roger