Question: do you see this on *all* of the systems you're running against? That would be a useful bit of data. Either way I'd open a case on this - a segfault isn't normal behavior at all with the iControl portal app. One thing you may do to help with the case is to enable debugging on the BigIP, which will hopefully help shed light on what is going on. But open a case either way. I'm testing on a 3900 with 10.2.1 by the way.
Here's how to set debug on the LTM - this will put information into /var/log/ltm on your iControl calls (also restart apache after this):
bigpipe db iControl.LogLevel debug
*Note: disable this after you're done by setting it back to "none"
Also, you'll definitely want to have a look at the apache error logs. Have a look in /var/log/httpd/httpd_errors.
-Matt