Description:
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I have page 1 which sets the session, also setting the cookie. Then page 2 which shows this cookie, and session, and 2 forms. The first form is short, and the second form is large (25x bigger than form 1). Both form actions point to page 3, which simply outputs the cookie/session. If you submit form 1, it will show you the phpsessid, and the session data. If you submit form 2, which is a rather large form, it will show you an empty cookie.

It seems that it forgets the cookie depending on the amount of input you give (how large a form is).

The problem has been reproduced several times, and I will attach (if possible) the source that reproduces this.

Also, the exact version of php is: 5.2.0-8+etch4

Reproduce code:
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http://tremulous.endra.org/htdocs.tar

Put those in your htdocs, and start with login.php.
With form 1, page 3 will show your cookie, with form 2, it won't.

Expected result:
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I expect to see the cookie.

Actual result:
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Array( ) instead of the array with the phpsessid in it.