Not a clue, but it would help if there's some more information.. Basically you are getting a GPF, of some kind, So opening a support case with Altera is probably the best way to get it resolved.
To get help here, we'll probably or through Altera, however, we are going to need more information, including:
1:) Version of Quartus and platform you are using (IE Windows (and version) /Linux (and version), 32-bit/64-bit, etc)
2:) a small sample code that produces the error is ideal (I know not always easy or able to release, but unless someone can reproduce your problem, it's hard to fix the issue)
Other things you can try is:
1:) delete the DB directory and incremental db directories form the synthesis directory and try again. I've seen this fix lots of issues, where a bad or corrupted DB file is causing the issue.
2:) Start commenting the source code out to isolate the section of code causing the issue.
Pete