Re: [Visualpython-users] seg faulting (SOLVED)

[John Z. <joh...@wa...>]

Hi All,

I think we have tracked down the problem with Vpython seg faulting on 64 bit Ubuntu with NVIDIA drivers. It appears that some packages install a minor version upgrade of some glx libraries that cause the breakage. The following command restores a working VPython for us:

sudo apt-get install libgl1-mesa-glx=8.0.2-0ubuntu3 libglapi-mesa=8.0.2-0ubuntu3

This reverts from the 8.0.3 version of these packages down to the 8.0.2 that was the original install and that the stock NVIDIA drivers are apparently built against.

So we now have Vpython working on 64-bit Ubuntu using both the stock NVIDIA drivers and python-visual that come with Ubuntu.

--John

John Zelle, PhD
Professor of Computer Science
Wartburg College


________________________________________
From: Bruce Sherwood [Bru...@nc...]
Sent: Monday, September 03, 2012 10:45 AM
To: vpusers
Subject: Re: [Visualpython-users] seg faulting

I guess this proves that my experience with the Boost libraries is
irrelevant. Thanks for this further analysis.

Bruce Sherwood

On Mon, Sep 3, 2012 at 7:38 AM, John Zelle <joh...@wa...> wrote:
> Hi All,
>
> Let me second what Guy is saying. I am attempting to run VPython using the stock Ubuntu package (python-visual Ubuntu 12.04, 64 bit), not building it myself.  It works out of the box with a clean install and update of all installed packages. However, it appears that some other package that I install later on breaks VPython. It also appears that the issue is somehow tied to NVIDIA drivers, since I don't have this problem on machines with Intel graphics. Others have reported that the seg fault starts after updating the NVIDIA pacakges for CUDA. I have not done that (yet), so it appears the problem is more general than that. Hopefully, we'll be able to track down the offending packages once I get some lab help back later this week.
>
> --John
>
> John Zelle, PhD
> Professor of Computer Science
> Wartburg College

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