[mythtv-users] ERROR: Master backend tried to connect back to itself!

Michael T. Dean mtdean at thirdcontact.com
Sat Nov 28 21:22:59 UTC 2009

On 11/28/2009 04:08 PM, Michael Tiller wrote:
> On Sat, Nov 28, 2009 at 3:58 PM, Michael T. Dean wrote:
>> On 11/28/2009 03:38 PM, Michael Tiller wrote:
>>  On Sat, Nov 28, 2009 at 12:35 PM, Michael T. Dean wrote:
>>>> We really need a good backtrace with debug symbols to /fix/ this issue.
>>>> http://www.mythtv.org/wiki/Debugging (again, 9months later, still asking
>>>> Ubuntu users to finish up the Ubuntu section with specifics).
>>> Sorry, I assumed this was probably a configuration issue more than a bug.
>>> Is there something that makes you think it is a bug?  I'm only asking
>>> because I'm not really very good at being able to distinguish the two.
>> http://www.gossamer-threads.com/lists/mythtv/dev/408168#408168
>> http://www.gossamer-threads.com/lists/mythtv/commits/297745#297745
> Ah, I see.  It wasn't clear to me that this was a known issue.  I thought
> your response was more of a "well if you want help, give us a backtrace".  I
> didn't realize there was some existing context for knowing this was in the C
> code.  At least I didn't realize it.  That is why I was puzzled since the
> debugging page specifically talks about crashes and this wasn't a crash.
>> Huge thanks to Mario for filling in the Ubuntu debug section at
>> http://www.mythtv.org/wiki/Debugging#Debugging_with_Ubuntu_packages .  All
>> the info you need is now there.
> I'm a bit confused.  According to the link you gave me, ticket #3720 was
> closed two years ago.  If I dig up debugging information, is there an open
> ticket I should report it to?  I couldn't find a way to search the existing
> tickets (which seems a bit odd in an of itself).

#3270 fixed all known locations where we have code that could result in 
an event loop.  We need to identify new locations so they can be fixed.

If you're able to identify such a location (by doing as Daniel suggested 
and adding an abort--or even with a gdb breakpoint--to stop execution 
when the error is printed) and capture a backtrace, just upload it to a 
new ticket that mentions an event loop and whose description contains 
the entire error message about the master backend connecting to itself.


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