I presently have 17 core.* files in my home directory, all dropped by 'gst-thumbnail'. GDB backtraces are predictably useless, indicating only that the crash came indirectly from libgsttypefindfunctions.so. I don't find anything about this in the CentOS bug tracker. Has anyone else seen a similar problem?
Running "strings" on the core files finds that they all mention either file:///home/schaefer/.mozilla/schaefer/tq3v7zkg.slt/history.dat or file:///home/schaefer/.mozilla/firefox/xsml50fe.default/history.dat
And indeed I was browsing those directories (doing some manual import of old mozilla data into my new firefox config) at the time stamped on all the core files.
schaefer[513] rpm -qf =gst-thumbnail nautilus-media-0.8.1-3 schaefer[514] rpm -qf /usr/lib/gstreamer-0.8/libgsttypefindfunctions.so gstreamer-plugins-0.8.5-1.EL.0