lookup error: /usr/lib/libdlfaker.so: undefined symbol: _vgl_dlopen

[Johann]

I have installed virtualgl (2.5.2) on Debian on two laptops to work with bumblebee and NVIDIA Graphics cards.

On the older laptop there is no problem. On the newer one I get the error message in the subject line when I run any command that involves some gui-based executable. I have to run "optirun <command>"  to get around this.  This is not sustainable.

In /usr/lib:

-rw-r--r-- 1 root root 643544 Apr 23 10:07 libvglfaker.so
-rw-r--r-- 1 root root 643544 Apr 23 10:07 libvglfaker-nodl.so

Also, while I can run Darktable with the opengl option on the first computer, it tells me on the second one that that option is not available although I run it through optirun or vglrun.

How do I solve this problem?

Regards
Johann

[DRC]

optirun/Bumblebee is not maintained or supported by us. Can you
reproduce this problem with our official VirtualGL packages:
https://sourceforge.net/projects/virtualgl/files/2.5.2/
??

Unfortunately O/S distributors sometimes package VirtualGL incorrectly,
in ways that cause certain applications to break (particularly when
those applications try to use dlopen() to load libGL.) This is often a
result of trying to shoehorn VirtualGL into particular system
requirements for DSOs without fundamentally understanding that VirtualGL
is an interposer and thus needs to be excepted from those requirements
in order to avoid breakage.

The fact that libvglfaker.so and libvglfaker-nodl.so are exactly the
same size on your system makes me immediately suspicious that you're
using an O/S-supplied or downstream VirtualGL package that was packaged
incorrectly. Please try again with our official DEB packages. If you
are still having problems with those packages, then we can go from there.

Also, I assume that you have installed the same version of the nVidia
proprietary drivers on both computers and that everything else is mostly
the same between the two of them.

DRC

[Johann]

The version I showed in my previous post was one I compiled from your sources.
 I did that because the official version (I have tried several of the older versions also)
gave the same problem.

I have removed an attempted solution (export LD_PRELOAD=/usr/lib/libdlfaker.so) from my shell startup file
 which proved to make the situation worse.

Now I can work despite some error messages from time to time.

Regards.
Johann

[DRC]

So in re-reading your initial message, something raised a red flag:

> On the older laptop there is no problem. On the newer one I get the
> error message in the subject line when I run any command that involves
> some gui-based executable. I have to run "optirun <command>" to get
> around this. This is not sustainable.

If you're getting that error without using vglrun/optirun, then
something is definitely wrong with your installation. In general, that
error would be generated if you are preloading libdlfaker.so without
also preloading libvglfaker.so, so double check your LD_PRELOAD
environment variable. If you use vglrun, libdlfaker.so will never be
preloaded without also preloading libvglfaker.so, so it should be
impossible to get that error on a properly-configured VirtualGL system.
However, it's easily reproducible if you, for instance, do:

LD_PRELOAD=libdlfaker.so {VirtualGL_build_directory}/bin/dlfakerut

On 4/24/18 3:12 AM, Johann wrote:
> The version I showed in my previous post was one I compiled from your
> sources.
>  I did that because the official version (I have tried several of the
> older versions also)
> gave the same problem.
>
> I have removed an attempted solution (export
> LD_PRELOAD=/usr/lib/libdlfaker.so) from my shell startup file
>  which proved to make the situation worse.
>
> Now I can work despite some error messages from time to time.
>
> Regards.
> Johann
> On Monday, 23 April 2018 17:40:03 UTC+2, DRC wrote:
>
> optirun/Bumblebee is not maintained or supported by us.  Can you
> reproduce this problem with our official VirtualGL packages:
> https://sourceforge.net/projects/virtualgl/files/2.5.2/

> ? <https://sourceforge.net/projects/virtualgl/files/2.5.2/?>?