Backend intermittently locks up

[mythtv@…]

On occasion - possibly only when watching live tv - my backend gets into a state where it will no longer respond to certain actions. The live tv playback ends, throwing the frontend back to the menu. It will not restart, and nor can I list my recordings. Also mythweb becomes unresponsive to requests for backend status, recorded programs, and upcomming recordings. Recording of programs seem to continue. Restarting mythbackend returns the system to a working state (although that of course stops any current recordings).

I didn't see this prior to upgrading to 0.24. Around the same time I added a Nova-S2 tuner to my system. After this happened a few times, I build a debug version, and then the problem seemed to stop, but I had another case of it last night. I've now obtained backtraces for all the running threads, hoping that might shed light on the problem.

I am using fixes/0.24 2394a9d70fe with a few local changes to H264Parser.cpp that cure problems with BBC HD programs.

[mythtv@…]

Backtraces

[mythtv@…]

The backend log

[mythtv@…]

Sorry, I tracked down my latest stall to a problem with my then H264Parser changes. During recording constant changes in aspect ratio were being misreported leading to the table recordedmarkup becoming huge. Attempts to sort that table stalled mysql, which in turn stalled mythbackend.

I don't believe the stalls I had in the past could be related to the latest one, but the past ones were some considerable time ago. I'd recommend closing this ticket. I can always rereport the problem it it recurs.

[robertm]

Thank you for reporting back.