[mythtv-users] MythSocket errors, backend unresponsive

[Bruce Taber]

On 08/06/2010 11:09 AM, Bob Cottingham wrote:
> On Thu, Aug 5, 2010 at 6:57 PM, Khanh Tran <khanh at khanh.net> wrote:
>> somewhere around r25084 (I'm running from -fixes branch), I started seeing
>> the following errors in my master backend:
>>
>> 2010-08-05 19:33:37.397 MainServer, Warning: Unknown socket closing
>> MythSocket(0xffffffffa9634c38)
>> 2010-08-05 19:33:37.401 MythSocket(ffffffffa9634c38:-1): writeStringList:
>> Error, socket went unconnected.
>>                         We wrote 0 of 10 bytes with 1 errors
>>
>> The backend process doesn't segfault, but nothing can connect or use it
>> either.  Sometimes, I get the following errors in the frontend logs:
>>
>> 2010-08-05 19:00:46.554 MythSocket(ffffffffb3a6bd10:35): readStringList:
>> Error, timed out after 30000 ms.
>> 2010-08-05 19:00:46.554 Connection to backend server lost
>> 2010-08-05 19:00:46.554 MythContext: Connecting to backend server:
>> 192.168.1.3:6543 (try 1 of 1)
>> 2010-08-05 19:00:53.554 MythSocket(ffffffffa4b00c98:35): readStringList:
>> Error, timed out after 7000 ms.
>> 2010-08-05 19:00:53.554 Protocol version check failure.
>>                         The response to MYTH_PROTO_VERSION was empty.
>>                         This happens when the backend is too busy to
>> respond,
>>                         or has deadlocked in due to bugs or hardware
>> failure.
>> 2010-08-05 19:00:53.554 Reconnection to backend server failed
>>
>> Anyone else experiencing this?  Have a workaround or fix?
> 
> Are you running a slave backend?  I've been having issues like this
> since .22-fixes whenever I run my slave backend.  Without the slave
> backend my master is very stable.  I've seen several people mention
> issues like this, but never a solution.  I have ticket #7608 open for
> my issue, but haven't had a single comment.
> 
> Bob
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> 
I've seen this happen running trunk with two slaves. After powering off
one of the slaves (exit and shutdown) the master no longer responds to
frontends or status. It will continue recording in-progress recordings.
If the mythbackend process is killed prior to powering off the slave,
the master continues to run normally. I have not done any further
testing to see if something else is influencing the behavior.

Bruce