Bug #22380: Ruby::Box: a GC while copying a class into a box crashes

• Status: Closed
• Assignee: tagomoris (Satoshi Tagomori)
• Target version: -
• ruby -v: ruby 4.0.7 (2026-09-22 revision 9aea6bb2f1) +YJIT +MN +PRISM [arm64-darwin27]
• Backport: 3.3: DONTNEED, 3.4: DONTNEED, 4.0: REQUIRED

[hsbt (Hiroshi SHIBATA)]

This is a backport request for the following crash:

$ RUBY_BOX=1 ruby --disable-gems -W:no-experimental -e 'GC.stress = true; module Enumerable; def m; end; end'
-e:1: [BUG] try to mark T_NONE object (obj: 0x00000001042efe28 T_NONE/, parent: 0x000000010416dc08 T_MODULE/Module Enumerable)

Fixed on master by 44fff96b0bc and 18b6bfdb67e (https://github.com/ruby/ruby/pull/18842). Ruby 4.0.7 still crashes.

[hsbt (Hiroshi SHIBATA)]

• Status changed from Open to Closed

[hsbt (Hiroshi SHIBATA)]

• Related to Misc #22275: Ruby::Box support plan for RubyGems and Bundler added