From: "mame (Yusuke Endoh) via ruby-core" <ruby-core@...>
Date: 2024-07-28T08:34:04+00:00
Subject: [ruby-core:118715] [Ruby master Bug#20655] Calling continuation triggers ensure function of rb_ensure

Issue #20655 has been updated by mame (Yusuke Endoh).


I guess https://github.com/ruby/ruby/pull/11264 will solve your issue. Could you give it a try with your patch?

----------------------------------------
Bug #20655: Calling continuation triggers ensure function of rb_ensure
https://bugs.ruby-lang.org/issues/20655#change-109249

* Author: tagomoris (Satoshi Tagomori)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-07-26T10:18:32Z test-ensure-called.. 9327e49d31) [arm64-darwin23]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
The bug is reproduced when:
* `rb_ensure(func1, arg1, func2, arg2)` is called with arguments:
  * func1: eventually calls `rb_f_require()` (or `Kernel#require` via rb_funcall)
  * func2: any C func
  * the required ruby script requires 'continuation' and calls `callcc` + `cont.call`

In this situation, `cont.call` triggers the `func2` specified with `rb_ensure`, even without any exceptions.
The `func2` call is triggered every time when `cont.call` is executed. If `cont.call` happens multiple times, `func2` will be called multiple times.

I created a pull-request to add the test case of this bug: https://github.com/ruby/ruby/pull/11254

And @ko1 -san said this bug is reproduceable by this code (Dir.chdir uses rb_ensure):

```
require 'continuation'

Dir.chdir('/tmp') do
  p [__LINE__, tmp = Dir.pwd]
  cont = nil
  callcc{|c| cont = c}
  p [__LINE__, Dir.pwd]
  exit! if Dir.pwd != tmp
  cont.call
end
```




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