Issue #13605 has been updated by wanabe (_ wanabe).

File patch-for-2508d68e.patch added
File Dockerfile added

I guess the code snippet is from pry. https://github.com/pry/pry/blob/c18601d6a4ff97d1b6599ccd9ffc8c63b8d8fccb/lib/pry/input_completer.rb#L172

Here are Dockerfile and patch for pry to reproduce the issue.
33 / 100 are aborted on my environment.

----------------------------------------
Bug #13605: GC bug calling `ObjectSpace.each_object`
https://bugs.ruby-lang.org/issues/13605#change-65164

* Author: ryanf (Ryan Fitzgerald)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
This code made Ruby bail out with the message "[BUG] rb_gc_mark(): 0x000000040dc740 is T_NONE":

~~~ ruby
ObjectSpace.each_object(Module){|m|
  next if (to_ignore.include?(m) rescue true)

  if m.respond_to?(:instance_methods)
    candidates.concat m.instance_methods(false).collect(&:to_s)
  end
}
~~~

I haven't been able to repro, but it happened building Pry on Travis CI: https://travis-ci.org/pry/pry/jobs/236720971

The relevant logs are attached.

---Files--------------------------------
each_object_bug.txt (81.9 KB)
patch-for-2508d68e.patch (8.07 KB)
Dockerfile (353 Bytes)


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