[development] Seg fault in PHP (FormsAPI)? Can you reproduce?

[Khalid B]

> It could be the forms API code ends up in an infinite loop over this
> little fella and, if so, i'm happy to fix it. Just need someone to
> reconfirm this happens (especially in another version of PHP).

I have had two instances of segfaults in PHP, though unrelated to
FormsAPI.

The first one I was able to track to an older version (Feb?) of the
og_forum contrib module, in the function og_forum_db_rewrite_sql().
For some reason it was getting called again and again until PHP
segfaulted. This happens with PHP 4.4.

The second one was when I switched from Mandriva to Ubuntu,
and from 4.3.x to 4.4. It would only happen when drupal was
installed under a subdirectory, so I suspect a mod_rewrite
bug, which someone reported on SuSE as well somewhere
on Drupal.org.