From: "jhawthorn (John Hawthorn) via ruby-core" <ruby-core@...>
Date: 2026-11-12T01:02:02+00:00
Subject: [ruby-core:127428] [Ruby Bug#22535] Release mode segfault due to half-initialized error in singleton_method

Issue #22535 has been updated by jhawthorn (John Hawthorn).

Backport changed from 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.3: DONTNEED, 3.4: REQUIRED, 4.0: REQUIRED

4.0: https://github.com/ruby/ruby/pull/19848
3.4: https://github.com/ruby/ruby/pull/19849

----------------------------------------
Bug #22535: Release mode segfault due to half-initialized error in singleton_method
https://bugs.ruby-lang.org/issues/22535#change-119874

* Author: tekknolagi (Maxwell Bernstein)
* Status: Closed
* Backport: 3.3: DONTNEED, 3.4: REQUIRED, 4.0: REQUIRED
----------------------------------------
This causes a segfault seemingly only in release mode:

    name = "never_interned_#{rand(10**12)}"
    begin
      Object.new.singleton_method(name)
    rescue NameError => e
      STDERR.puts "rescued #{e.class}; e.name.class = #{e.name.class}"
      STDERR.puts e.message          # segfaults here (rb_sym_to_s on ID2SYM(0))
    end



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