exited on signal 11 on unrar

[Adrien FACHE]

Hi all,

This is my first experiencing with writing to English-speaking
  mailing list, so, please excuse me for possible mistakes.

I'm a newbie on freebsd. I have a mail server on FreeBSD 4.7 with
Postfix and Amavis ( mail virus scanner ).

The problem is I got this in my log periodically :

/kernel: pid 24499 (unrar), uid 1010: exited on signal 11 (core dumped)

I use unrar for Amavis 

Does this look like a software or hardware problem? 

If anyone have a idea


Thanx in advance



Adrien