empcommand segfaults at start

Dear Ronald,
thanks for your report.

The LD_PRELOAD workaround shouldn't be needed anymore, after the fix released for mesa package ( https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/259219 ). In particular, libstdc++.so.6 is preloaded anyway from the top level libavg python package. In addition, your attempt to preload fails, because the path to libstdc++.so is not correct.

This bug is probably related to libavg more than empcommand itself, by the way, can you please:

1. run a gdb session and dump the backtrace:

$ gdb python
(gdb) run /usr/games/empcommand
<wait for the program to crash>
(gdb) bt

2. run this minimal snippet and see if you get a crash as well:

$ python
> import libavg
> libavg.AVGApp.start(resolution=(640,480))

(in case you don't get the segv, you'll see a black window. Attempt to close the window (which won't close) and CTRL-D on the shell).

Thanks!

gdb output:

fader@simon:~$ gdb python
GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/python...(no debugging symbols found)...done.
(gdb) run /usr/games/empcommand -w -r 800x600
Starting program: /usr/bin/python /usr/games/empcommand -w -r 800x600
[Thread debugging using libthread_db enabled]
[11-07-11 09:11:00.722] APP: Setting resolution to: [800, 600]
/usr/share/games/empcommand/engine.pyc
/usr/share/games/empcommand/fonts
[New Thread 0x5067b70 (LWP 2040)]
[Thread 0x5067b70 (LWP 2040) exited]
[New Thread 0x5067b70 (LWP 2041)]

Program received signal SIGSEGV, Segmentation fault.
0x02850625 in xcb_writev () from /usr/lib/i386-linux-gnu/libxcb.so.1
(gdb)

fader@simon:~$ python
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import libavg
>>> libavg.AVGApp.start(resolution=(640,480))
Segmentation fault
fader@simon:~$

Just for reference, libxcb1 is the same version on both the working and nonworking system.

fader@simon:~$ dpkg-query -W libxcb1
libxcb1 1.7-2ubuntu2

Dear Ronald, thanks again for your feedback.
Ok, it's not an empcommand bug. Would you please file a bug in libavg package ( https://bugs.launchpad.net/ubuntu/+source/libavg/ ), restating your configuration (please add also some hardware info regarding your graphics adapter)?

It will be also useful to have a backtrace:
once you're here:

Program received signal SIGSEGV, Segmentation fault.
0x02850625 in xcb_writev () from /usr/lib/i386-linux-gnu/libxcb.so.1
(gdb)

just write:

bt<enter>

Thanks!