Here is a sure fire way to duplicate your result:
dictionary.c and speller.c open in editor
click Debug from dictionary.c
Say "Oops!" [optional]
switch to speller.c tab and click Debug
Watch CPU climb to 100%
This sequence leavse a gdb running, and the only way I have found to get rid of it is to kill it from a command line. Here's one way:
Stop and close ...