From: "peterzhu2118 (Peter Zhu) via ruby-core" <ruby-core@...>
Date: 2023-02-01T14:12:03+00:00
Subject: [ruby-core:112172] [Ruby master Bug#19398] Memory leak in WeakMap

Issue #19398 has been reported by peterzhu2118 (Peter Zhu).

----------------------------------------
Bug #19398: Memory leak in WeakMap
https://bugs.ruby-lang.org/issues/19398

* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Pull request: https://github.com/ruby/ruby/pull/7223

There's a memory leak in ObjectSpace::WeakMap due to not freeing the `struct weakmap`. It can be seen in the following script:

```ruby
100.times do
  10000.times do
    ObjectSpace::WeakMap.new
  end

  # Output the Resident Set Size (memory usage, in KB) of the current Ruby process
  puts `ps -o rss= -p #{$$}`
end
```

This is the memory usage graph before and after the patch:

![](chart.png)


---Files--------------------------------
chart.png (26.9 KB)


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