Is the backtrace not helpful in figuring out where to set up
breakpoints? As in, “gdb foo”, then “run”, wait for the crash, and type
“bt”?

The darktable development documentation suggests[1] the following to log
useful backtraces:

    |$ gdb darktable ... crash dt here ... (gdb) set pagination off
    (gdb) set logging file gdb.txt (gdb) set logging on (gdb) thread
    apply all bt full|

If you need to do this non-interactively, you can combine it with gdb’s
batch mode. Strangely, I have a spec file that demonstrates this [2].
The debugbreak package is a header-only C library that implements
programmatic breakpoints, so the natural way to test it is with the
debugger.

Hopefully some of that is helpful.

– Ben

[1] https://www.darktable.org/development/

[2]
https://src.fedoraproject.org/rpms/debugbreak/blob/e009ccfac2b8e05a6018921ed6d3e732837a9e52/f/debugbreak.spec#_62

On 12/28/21 08:08, JT wrote:
> Hey all,
> I havent used gdb in a while, so I'm trying to knock the rust off my
> knowledge and pick up a few more skills.
> I'm trying to track down an issue in the Lumina Desktop. One of the
> utilities (lumina-screenshot) segfaults when starting up and I'm
> trying to deduce why.  The problem is that it gets pretty far into the
> program starting before it finally dies and I havent been able to step
> through gdb enough manually to find that point.
>
> Is there a way to run gdb in a capture mode of some kind and dump the
> output entirely like I can do with strace?
> I kinda need to know where it's crashing to have an idea of where to
> set up breakpoints.
>
> Unless my memory is off, I was sure there was a way to do this but I
> just can't seem to remember or figure out how to do it.
>
> Any pointers?  Thanks!
>
> JT
>
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