I submitted a patch for this (patch# 2029039).
a variables was not initialized properly.
John

Index: server/Simulator.cc
===================================================================
--- server/Simulator.cc    (revision 6915)
+++ server/Simulator.cc    (working copy)
@@ -71,6 +71,7 @@
   physicsEnabled(true),
   timeout(-1)
 {
+    selectedEntity = NULL;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
On Tue, Jul 29, 2008 at 10:38 AM, David J. Mackay <David.Mackay@drdc-rddc.gc.ca> wrote:
Hello All,

With the latest svn gazebo 6931 running on an x86-64 FC7 machine, I'm
getting a segmentation fault when I try to run gazebo with the example
worlds.  A typical trace  under gdb looks like:

[server/GazeboConfig.cc:68]
 Gazebo Path[/usr/local/share/gazebo]
[server/GazeboConfig.cc:76]
 Ogre Path[/usr/local/lib/OGRE]
creating /tmp/gazebo-dmackay-0
creating /tmp/gazebo-dmackay-0/simulation.default 112 145592
creating /tmp/gazebo-dmackay-0/position.position_iface_0 112 288
creating /tmp/gazebo-dmackay-0/laser.laser_iface_0 112 12512
creating /tmp/gazebo-dmackay-0/fiducial.fiducial_iface_0 112 22600

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912526904368 (LWP 23683)]
0x00000031f68be005 in __dynamic_cast () from /usr/lib64/libstdc++.so.6
(gdb) bt
#0  0x00000031f68be005 in __dynamic_cast () from /usr/lib64/libstdc
++.so.6
#1  0x00000000004c7fa0 in gazebo::Toolbar::Update (this=0x789200) at
server/gui/Toolbar.cc:87
#2  0x00000000004c4476 in gazebo::Gui::Update (this=0x7817d0) at
server/gui/Gui.cc:121
#3  0x00000000004e938d in gazebo::Simulator::MainLoop (this=0x731670) at
server/Simulator.cc:291
#4  0x00000000004cfb9b in main (argc=2, argv=0x7fff33ab3b28) at
server/main.cc:293

Any thoughts?

TIA
--
David J. Mackay <David.Mackay@drdc-rddc.gc.ca>

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--
John Hsu
Willow Garage
650-475-2809
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