[mythtv] Need help catching a segfault in mythbackend?

[Stuart Auchterlonie]

On Thu, 24 May 2007 15:47:02 -0700, "Michael Rice" <mikerice1969 at gmail.com>
wrote:
> On 5/22/07, Mark Paulus <mark.paulus at verizonbusiness.com> wrote:
>>
>> You could change /etc/init.d/mythbackend  to start gdb also and attach
> it to
>> the running mythtv-backend process.  Or, you could run mythtv-backend
>> under strace.  Just prepare for large amounts of logging output
>> if you use strace.
> 
> Does anyone run gdb in their mythbackend startup script?  I tried both
> running mythbackend directly from gdb and attaching to the mythbackend
> process but since gdb doesn't run as a daemon the script will wait for
> gdb to end.  I tried running "daemon gdb ..." and "gdb &" but neither
> seems to allow the script to finish.  Anyone help me get this working?
>  I am running of FC5.
> 

Not running from the startup script, but i've found attaching the debugger
to the running instance of the backend works well.

gdb /fullpath/to/mythbackend <pidof-mythbackend>

as root. It'll attach to the process and drop you into gdb. Then

set pagination off
set logging file backend-gdb.log
set logging on
cont

and then the backend will continue on it's merry way, and you can
leave it till it crashes.


Stuart