Re: Bug found via FXGLViewer::pick()

Hello once again!

I figured I'd post my resolution in case anyone else runs into this issue.

I installed a ppa with an even newer version of the mesa packages and 
the problem is fixed.  I assume this means the bug was found & patched, 
and the main Ubuntu repos just aren't quite up to date, yet.  This means 
(1) I have a temporary workaround, and (2) a fix will likely be deployed 
before our other PCs upgrade to 22.04.

Thanks again for all the help,

Dave

On 2/13/23 11:00, David Vereb wrote:
>
> CAUTION: This email originated from outside your organization. 
> Exercise caution when opening attachments or clicking links, 
> especially from unknown senders.
>
> 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/>
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>>>
>>>
>>> _______________________________________________
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>>
> -- 
>
> 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

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