Comment author: administrator

Full_Name: Eijiro Sumii
Version: 3.07
OS: Linux
Submission from: pcp01330153pcs.chrstn01.pa.comcast.net (68.81.130.132)

A program using Graphpics segfaults in many recent Linux distributions,
even though it is not using any unsafe feature. It can be downloaded at:

http://www.cis.upenn.edu/~sumii/tmp/sim.tar.gz

To reproduce the problem:

(1) tar xvzf sim.tar.gz
(2) cd sim
(3) make
(4) ./graphic -world sample0.world -red sample.ant -black sample.ant
(5) hit "t" in the window and wait
(6) hit "t" again if the animation stops

The problem does not occur in older distributions. It may perhaps be due to
some version of Xlib, but I'm not sure. Please contact me if it doesn't
reproduce in your environments.

P.S. Now you understand why I've been submitting so many reports here, in
particular about Graphics.:-)

Thank you or your bug report and your interesting program.

However I'm sorry, I cannot reproduce the segfault. I hit the t key
for minutes with unfortunately (?) no segmentation faults.

I tried it on a debian distribution (unsafe, i.e. the bleeding edge).

Since you mentioned that ``modern Xlib''s could be a problem, I
recompiled a fresh X distribution on my machine; now, X -version
reports:

XFree86 Version 4.4.99.7
Release Date: 12 June 2004

I still cannot reproduce the problem. (However, something evidently
changed on the machine after this new Xlib showed up, since my FireFox
browser is now happily segfaulting, even after a full recompilation
and re-installation).

So, we need some more context to reproduce and track this bug.

Pierre Weis

INRIA, Projet Cristal, Pierre.Weis@inria.fr, http://pauillac.inria.fr/~weis/

Comment author: administrator

Dear Eijiro,

A program using Graphpics segfaults in many recent Linux distributions,
even though it is not using any unsafe feature. It can be downloaded at:

It's a known bug in Graphics.set_window_title in 3.07 (including pl2).
The bug is fixed in the working sources. In the meantime, better not
use Graphics.set_window_title.

Cheers,

• Xavier Leroy

Comment author: administrator

fixed on 2004-01-09 by DR