Re: Bug found via FXGLViewer::pick()

Good morning,

Thank you for looking at it.  After further testing I can get it to 
crash with a PC with an NVIDIA GT710.  On my computer with just the 
onboard graphics it just moves along without crashing, but, as you said, 
doesn't work properly and doesn't generate a core dump. In any event, 
it's definitely something in a recent update as it used to work just 
fine on the same PC.  I've since discovered debuginfod and will try my 
best to head into the call stack.  I will email back if I find a solution.

Also, I didn't realize just how much of our software relies on pick() 
until it all became inaccessible!  :)

Thanks again,

Dave


On 2/13/23 08:52, [email protected] wrote:
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> On 2023-02-10 16:05, David Vereb wrote:
>> Hello everyone,
>>
>> I've encountered a bug after updating my Ubuntu 22.04 installation.
>> Our code works on Ubuntu kernel 5.15.0-56-generic, but not on
>> 5.15.0-58-generic or 5.15.0-60-generic.  I understand that this is
>> likely not a bug in Fox Toolkit, but I don't know how to further
>> investigate and was hoping someone here could provide assistance (or
>> at least lead me in the right direction).
>>
>> Please see https://github.com/dvereb/fox-pick-bug for a minimum viable
>> example.  I've included a backtrace where my program segfaults in the
>> README, and it's simple enough to install & run via make && ./a.out.
>> Note that I'm on fox-1.6.57-1build1 in the Ubuntu repository.
>>
>> If there's anything else you need me to look up & respond back with,
>> please let me know.  I've tried this on multiple machines with the
>> same hardware: Intel(R) Core(TM) i3-10100 CPU with onboard graphics.
>
> I have older i5-8500 processor running integrated GPU and am seeing
> FXGLViewer's pick() not working.
>
> With NVIDIA GTX3060 the pick() works fine. [This is with latest FOX
> version, incidentally)].
>
> So it appears to be OpenGL driver issue. Not sure what it would take
> to fix it, maybe dive into the Mesa graphics code and see where it
> goes off the rails.
>
> I am not getting a core dump, btw. Just pick not working.
>
>
>   -- JVZ
-- 

David Vereb
/Lead Software Developer/
Office: 814.464.1525
1851 Rudolph Avenue
Erie, PA 16502
www.eriestrayer.com <http://www.eriestrayer.com/>
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