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front end - Segmentation fault on auto-complete



My front-end freezes as soon as I type more than two letters in a notebook. I think the error occurs, when the auto-complete feature kicks in. If Mathematica was started from a terminal, the following text is shown.



Mathematica has received the signal: SIGSEGV and has exited.
If possible, please report this problem to support@wolfram.com
describing in as much detail as possible what you were doing
when the problem occurred.

I use Mathematica 10.3 on Ubuntu 12.04. Rebooting and -cleanstart did not help. This installation worked fine for quite some time, but suddenly this problem appeared.


Is this a known problem? Before I contact the official support, I want to make sure that there is no trivial fix.



Answer




(Posting my comment as an answer, per @murphy's suggestion)


Please check the folder


$UserBaseDirectory/SystemFiles/FrontEnd/SystemResources/Functional‌​Frequency


and see if there are any unusually large files there (>100 Kb or so). If any such files exist, please delete them. The file CodeAssistHistory10.3.m is often the culprit, and is safe to delete.


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