From: "alanwu (Alan Wu) via ruby-core" <ruby-core@...>
Date: 2025-03-11T03:08:01+00:00
Subject: [ruby-core:121280] [Ruby master Bug#21180] SEGV while marking `imemo_env->iseq`

Issue #21180 has been reported by alanwu (Alan Wu).

----------------------------------------
Bug #21180: SEGV while marking `imemo_env->iseq`
https://bugs.ruby-lang.org/issues/21180

* Author: alanwu (Alan Wu)
* Status: Open
* Backport: 3.1: DONTNEED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
This issue happens most realistically for people using a fiber scheduler (through e.g. the *async* gem), on Ruby 3.4.x and on Linux, but the following crashes for me for 3.2 and newer on macOS:
```
$ tail -n +1 test.rb ret1.rb
==> test.rb <==
require 'continuation'
module Warning
  def self.warn(message)
    GC.stress = true
    callcc
  end
end
require_relative 'ret1'

==> ret1.rb <==
return 1
```

Keywords for people searching: `rb_imemo_mark_and_move`, `Note that the Fiber scheduler is enabled`.

I have a fix for this and will submit a pull request shortly.



-- 
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