Re: Bug found via FXGLViewer::pick()

Thank you for the links, Roland.  I'm familiar with core dumps, but I'm 
a bit less familiar with third party libraries in my core dumps.  I'm 
not used to the bug being *outside* of my code. ;)

I started troubleshooting from the closest code to fox which appeared to 
be the mesa library.  It worked on Mesa 21.2.6, but did not on Mesa 
22.2.5.  Fortunately I was able to see another available version in the 
ubuntu repos, 22.0.1-1ubuntu2.  I've since installed these (and 
dependencies) with the command below and the bug has gone away.  I 
assume this means the bug is somewhere in the mesa library updates 
between those two versions, which I will continue to investigate.

sudo apt-get install -f libgl1-mesa-dev=22.0.1-1ubuntu2 
libgl1-mesa-dri=22.0.1-1ubuntu2 libglapi-mesa=22.0.1-1ubuntu2 
libegl-mesa0=22.0.1-1ubuntu2 libgbm1=22.0.1-1ubuntu2 
libglx-mesa0=22.0.1-1ubuntu2

Thanks,

Dave


On 2/13/23 09:36, Roland Hughes via Foxgui-users wrote:
> CAUTION: This email originated from outside your organization. 
> Exercise caution when opening attachments or clicking links, 
> especially from unknown senders.
>
> 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:
>>> CAUTION: This email originated from outside your organization. 
>>> Exercise caution when opening attachments or clicking links, 
>>> especially from unknown senders.
>>>
>>> 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/>
>> Erie Strayer Company Logo & Social Media Icons
>>
>>
>> _______________________________________________
>> Foxgui-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/foxgui-users
>
-- 

David Vereb
/Lead Software Developer/
Office: 814.464.1525
1851 Rudolph Avenue
Erie, PA 16502
www.eriestrayer.com <http://www.eriestrayer.com/>
Erie Strayer Company Logo & Social Media Icons

_______________________________________________
Foxgui-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/foxgui-users