Happy New Year
Sorry, i can't reproduce the error.
the last ibus message before crash is obcspeedrpm. and it works well on my system.
Can you test with an other system?
which ibus interface do you use?
i saw in your debug file you use a RR version of august 2010.
is there a way to update your RR version? maybe the plugin uses functions, which your RR version don't support.