I had a problem with gftp core dumping when I was transferring a
bunch of files to another system....the message was connection
stopping after 30 seconds or something like that and gcc would
core dump after a few seconds.

Well, the problem happened because one the files in the directory
had a root ownership by accident that I was trying to overwrite and
thus did not have permission...should not core dump....not prudent.
The server was running wu-ftpd 2.6.1.

FYI