Hi, I used sudo debuginfo-install firefox To get the debugging packages necessary to run firefox from within gdb and get some meaningful stack trace output - see http://bugs.centos.org/view.php?id=3258 To make this work properly, I installed the 'debuginfo-repo' like this: more /etc/yum.repos.d/debuggery.repo [debuggery] name=CentOS-$releasever - DebugInfo baseurl=http://debuginfo.centos.org/$releasever/$basearch/ priority=1 However, it seems there is a problem with the pango package in that repo, because when I fire up firefox within gdb I get the following warnings: (gdb) run -P "Local Disk" Starting program: /usr/lib/firefox-3.0.4/firefox -P "Local Disk" (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1208387888 (LWP 7595)] warning: the debug information found in "/usr/lib/debug//usr/lib/libpangocairo-1.0.so.0.1400.9.debug" does not match "/usr/lib/libpangocairo-1.0.so.0" (CRC mismatch). warning: the debug information found in "/usr/lib/debug//usr/lib/libpangoft2-1.0.so.0.1400.9.debug" does not match "/usr/lib/libpangoft2-1.0.so.0" (CRC mismatch). warning: the debug information found in "/usr/lib/debug//usr/lib/libpango-1.0.so.0.1400.9.debug" does not match "/usr/lib/libpango-1.0.so.0" (CRC mismatch). [New Thread -1210643568 (LWP 7598)] [New Thread -1221133424 (LWP 7599)] FoxyProxy settingsDir = /local/Scratch/.mozilla/firefox/fcftz9c3.default [New Thread -1231643760 (LWP 7600)] [New Thread -1243612272 (LWP 7601)] [Thread -1243612272 (LWP 7601) exited] [New Thread -1254102128 (LWP 7602)] [Thread -1254102128 (LWP 7602) exited] [New Thread -1254102128 (LWP 7603)] [New Thread -1243612272 (LWP 7604)] [New Thread -1265009776 (LWP 7605)] warning: the debug information found in "/usr/lib/debug//usr/lib/pango/1.5.0/modules/pango-basic-fc.so.debug" does not match "/usr/lib/pango/1.5.0/modules/pango-basic-fc.so" (CRC mismatch). [Thread -1265009776 (LWP 7605) exited] [New Thread -1265009776 (LWP 7606)] [New Thread -1342178416 (LWP 7607)] ... This seems strange, because looking at the output of this: [dbolser at cricket ~]$ yum list installed | grep pango pango.i386 1.14.9-3.el5.centos installed pango-debuginfo.i386 1.14.9-3.el5.centos installed pango-devel.i386 1.14.9-3.el5.centos installed Seems to suggest that all the package versions match. Also, for the sake of yum, how come the debuginfo packages do not depend on their version matched package counterpart? Thanks for any help, and sorry if this is the wrong place to post such a message - please just let me know where I should have sent the email. All the best, Dan. -- http://network.nature.com/profile/dan