[bug #59025] Parameters leak.

[Arthur A. Gleckler]

URL:
  <https://savannah.gnu.org/bugs/?59025>

                 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
                Keywords: 

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Details:

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)))
(loop)))

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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