Re: Bug found via FXGLViewer::pick()

Finding your core dumps

https://www.logikalsolutions.com/wordpress/information-technology/core-dumps/

Using your core dumps

https://www.logikalsolutions.com/wordpress/information-technology/core-dumps-2/


On 2/13/2023 8:26 AM, David Vereb wrote:
>
> 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
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>
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