From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2024-03-31T10:19:27+00:00
Subject: [ruby-core:117384] [Ruby master Bug#20194] Memory leak with TracePoint on bmethod

Issue #20194 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE to 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE

ruby_3_2 1b5c74a2408d248f35cb811327dd51f49ee37c9e merged revision(s) b14674b236445fb70f484603e678722760f678f4.

----------------------------------------
Bug #20194: Memory leak with TracePoint on bmethod
https://bugs.ruby-lang.org/issues/20194#change-107546

* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Backport: 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/9614

When disabling the TracePoint on bmethod, the hooks list is not freed.

For example:

```ruby
obj = Object.new
obj.define_singleton_method(:foo) {}
bmethod = obj.method(:foo)
tp = TracePoint.new(:return) {}

10.times do
  100_000.times do
    tp.enable(target: bmethod) {}
  end

  puts `ps -o rss= -p #{$$}`
end
```

Before:

```
18208
22832
26528
29728
34000
37776
40864
44400
47680
51504
```

After:

```
16688
17168
17168
17248
17696
17760
17824
17824
17856
17920
```



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