>* Is this crash reproducible?
>* If so, which are the steps that lead to it?

No. I cannot reproduce the error.

But I will later make a fresh installment of Herd 5 and will have a better 
chance to test this issue.  Gonna test with both nvidia-glx and 
nvidia-glx-legacy packages.
----

Is this error related?

$ glxgears 
XIO:  fatal IO error 22 (Invalid argument) on X server ":0.0"
      after 36 requests (36 known processed) with 0 events remaining.
glxgears: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted (core dumped)

Does the xorg use the XCB library (the new Xlib replacement)? That would be a 
major step forward.
-----

This may not make any sense, but I run:

$  valgrind -v --tool=memcheck --leak-check=full --num-callers=25 --log-
file=valgrind.log glxgears -info

GL_RENDERER   = GeForce 6800 LE/AGP/SSE2/3DNOW!
GL_VERSION    = 2.1.0 NVIDIA 96.31
GL_VENDOR     = NVIDIA Corporation
...

logfile attached.

** Attachment added: "valgrind ... glxgears"
   http://librarian.launchpad.net/6644323/valgrind-logs-glxgears.tar.gz

-- 
[apport] glxinfo crashed with SIGSEGV
https://launchpad.net/bugs/89498

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