On Sat, Apr 25, 2009 at 5:28 AM, Andy Walls <[email protected]> wrote:
> On Thu, 2009-04-23 at 21:44 -0400, Andy Walls wrote: > > On Thu, 2009-04-23 at 09:37 -0700, John Lundell wrote: > > > Hi Andy > > > > > > I tried the cx18-perf branch to see if it would fix my minor problem > > > when recording multiple streams (would occasionally drop a buffer when > > > recording). This branch unfortunately made things much worse and has > > > appears to have made my myth backend to crash three times in the last > > > three days. > > > > Is this happening for analog captures, digital captures, or both with > > the HVR-1600? > > > > Assuming this is happening for analog captures only, we may be running > > into a BUG_ON() in the driver when reading a buffer and scheduling the > > work object that the outgoing work handler is already acting upon. I > > know what to do if this is the case. (I thought the kernel handled this > > case gracefully, but I wasn't totally clear.) The "random" nature > > sounds about right for this sort of race condition. > > > > > > > I have two cards, one a HVR1600 and the other a DViCO FusionHDTV7 Dual > > > Express. The problem seems to randomly happen with the HVR1600 HD > > > tuner starts recording. It has a lower priority than the two DViCO HD > > > tuners so it only kicks in occansionally. > > > > > > What can I do to help debug the problem? > > > > Hmmm. Could you please send the portions of the MythTV log at the time > > of the capture and through the crash? I'd like to see what MythTV is > > griping about. > > > > Also could you look for cx18 related messages in dmesg > > or /var/log/messages for that same time period? > > > > Also, look for any "Oops" or "Bug" messages in the dmesg > > or /var/log/messages, I'd like to see the complete dump from such a > > message. > > > > John, > > I'll have time to work on cx18 problems this evening (EDT). Could you > provide some log output before then? > > Since this particular changeset is more complex than most, I'd like to > get any problems debugged before I forget any nuances. I also know I > have a time window tonight when the kids won't break my concentration > every 5 minutes. :) > > Regards, > Andy > Hi Andy, Sure, I can try some tests this morning. John
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