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[bug #59025] Parameters leak.

From: Arthur A. Gleckler
Subject: [bug #59025] Parameters leak.
Date: Thu, 27 Aug 2020 19:19:41 -0400 (EDT)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36


                 Summary: Parameters leak.
                 Project: MIT/GNU Scheme
            Submitted by: aag
            Submitted on: Thu 27 Aug 2020 11:19:40 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



Jim Rees reported this bug to me privately, then gave me permission to use his
message as part of a bug report:

> (let loop () (parameterize (((make-parameter #f) (make-vector 10000)))

Goes kaboom due to unbounded memory usage on chibi, chicken, chez, mit-scheme,
guile, & gauche (that's all I tested).

[My Scheme] happily chugs along gc'ing forever on my scheme without growing
(as of yesterday) :-D

While fixing a bug recently,  I realized that parameterize is potentially a
leak if parameters are being cons'ed up & forgotten a lot.    So, I made my
continuation marks all based on ephemerons instead of pairs, and now there's
no leak -- and I seem to be the only one who's noticed it and bothered to do
something about it.

It's not really an issue because I know of no practical use for an unbounded
number of created & forgotten parameter objects.


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