[mythtv-users] Mythfrontend hangs - thread deadlock?

[Jos Hoekstra]

Thomas Fjellstrom schreef op 8-11-2008 21:42:
> On Saturday 08 November 2008, William wrote:
>> Jos Hoekstra wrote:
>>> William schreef op 8-11-2008 14:14:
>>>> Jeff Bevis wrote:
>>>>> The problem I am currently stuck with is this:  After a long time
>>>>> sitting on the recordings playback menu, the frontend process gets
>>>>> hung.  Frequently (maybe always - not 100% sure) this is accompanied
>>>>> by the dreaded "The connection to the backend server has gone away for
>>>>> some reason.  Is it running?" message.  btw:  backend is on a
>>>>> different machine, and is still running ok.
>>>>>
>>>>> Anyone got any suggestions on this?
>>>>> -Jeff
>>>> I have the same issue and have seen this question come up several times
>>>> however I have yet to see a true solution. My personal solution is to
>>>> not leave the frontend parked on the recordings screen. I still get an
>>>> occasional hang but when they happen the entire system locks so its
>>>> probably a different issue.
>>>>
>>>> William
>>> I only have this problem when the backend goes away(ie not responding to
>>> connections, backend not running, disconnected) Are you sure your
>>> backend is reachable from the frontend? Sometimes it helps to exit to
>>> the media screen and go back in to the recordings screen.
>>>
>>> Regards,
>> For me its a complete lock. Video frozen on screen. Keyboard dead, no
>> ssh or vnc access, apache is dead too. No recordings either so its quite
>> dead. Only exit is the reset button or power switch held for 3 seconds.
>> I tried setting up monit to see if that might be able to help however it
>> appears to freeze as well.
> 
> So a full hardware hang. Have you been able to test ALT+SYSRQ key presses? 
> particularly "s" (sync), "u" (remount readonly), "b" (reboot immediately). I 
> like to press "s" a few times, then "u", "s" some more times (to make sure 
> everything is synced to disk, but its just overkill, a single u and wait for 
> the HD light to stop blinking is all you _should_ need), and then "b" to 
> reboot. That way the filesystems aren't corrupted. If none of them work, well 
> then it really is a full hardware hang, and the culprit is usually effective 
> hardware or bad drivers.
> 
>> I recently upgraded to Ubuntu 8.10 and have not had an issue with it
>> yet. With my luck, writing this will cause it to lock... :)
>>
>> W

Just wanted to write down the same thing(almost). The logs might prove 
usefull, it might give you an insight of where to look.

Jos