[mythtv] [mythtv-commits] Ticket #1805: Backend not responding, with backtrace and log

[Jim Westfall]

MythTV <mythtv at cvs.mythtv.org> wrote [05.22.06]:
> #1805: Backend not responding, with backtrace and log
> -------------------------------------+--------------------------------------
>  Reporter:  tom at redpepperracing.com  |        Owner:  ijr
>      Type:  defect                   |       Status:  new
>  Priority:  minor                    |    Milestone:     
> Component:  mythtv                   |      Version:     
>  Severity:  medium                   |   Resolution:     
> -------------------------------------+--------------------------------------
> Comment (by tom at redpepperracing.com):
> 
>  Just happened again, I believe the comment on the -dev list about it
>  having to do with a slave backend generating a thumbnail is correct. This
>  time when it happened I had all tuner in the master being used, and the
>  first tuner in the slave jsut started a recording, and when I went to the
>  frontend to look at the recordings list, the front end hung; the slave
>  recording was the first in the list, and there was no thumbnail. I managed
>  to get a backtrace from the master, the slave gave me an error when I
>  tried to generate the bt, and I have logs from both backends. See
>  attached.
> 

It would be most helpful to get a backtrace on that slave backend so see 
what its doing.

The master backend is stuck in the following loop with a lock on the 
slave backend socket.

    while (socket->waitForMore(5) < 8)
    {
        if (socket->state() != QSocket::Connected)
        {
            // dunno if socket->state() wants the app lock.  be safe for now.
            qApp->unlock();
            return false;
        }

        qApp->unlock();
        usleep(500);
        qApp->lock();
    }

The question is, is the slave backend not responding to the genpixmap 
request for some unknown reason or has the socket gone away and 
socket->waitForMore() isnt enough to trigger a state change on to 
!QSocket::Connected.

jim