From: "peterzhu2118 (Peter Zhu) via ruby-core" <ruby-core@...>
Date: 2022-12-21T14:56:04+00:00
Subject: [ruby-core:111362] [Ruby master Bug#19248] TestGCCompact#test_moving_objects_between_size_pools test failure

Issue #19248 has been updated by peterzhu2118 (Peter Zhu).


Thank you for this bug report. Could you run this script and paste the output? It will help me to debug this issue.

```
require "objspace"

class Foo
  def add_ivars
    10.times do |i|
      instance_variable_set("@foo" + i.to_s, 0)
    end
  end
end

OBJ_COUNT = 500

GC.verify_compaction_references(expand_heap: true, toward: :empty)

ary = OBJ_COUNT.times.map { Foo.new }
ary.each(&:add_ivars)

GC.start
foo = Foo.new
foo.add_ivars

puts "--- BEFORE COMPACT"
puts GC.stat
puts
puts GC.stat_heap
puts
puts ObjectSpace.dump(ary[0])
puts
puts ObjectSpace.dump(foo)
puts

stats = GC.verify_compaction_references(expand_heap: true, toward: :empty)

puts "--- AFTER COMPACT"
puts stats
puts
puts GC.stat
puts
puts GC.stat_heap
puts
puts ObjectSpace.dump(ary[0])
puts
puts ObjectSpace.dump(foo)
```

----------------------------------------
Bug #19248: TestGCCompact#test_moving_objects_between_size_pools test failure
https://bugs.ruby-lang.org/issues/19248#change-100737

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0dev (2022-12-21 master 6af6857ecf) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Testing on Fedora Rawhide with commit:git|6af6857ecf, I observe the following error:

~~~
  1) Error:
TestGCCompact#test_moving_objects_between_size_pools:
NoMethodError: undefined method `>=' for nil:NilClass
    /builddir/build/BUILD/ruby-3.2.0-6af6857ecf/test/ruby/test_gc_compact.rb:278:in `<main>'
    /builddir/build/BUILD/ruby-3.2.0-6af6857ecf/test/ruby/test_gc_compact.rb:256:in `test_moving_objects_between_size_pools'
    /builddir/build/BUILD/ruby-3.2.0-6af6857ecf/tool/test/runner.rb:23:in `<top (required)>'
    /builddir/build/BUILD/ruby-3.2.0-6af6857ecf/test/runner.rb:16:in `require_relative'
    /builddir/build/BUILD/ruby-3.2.0-6af6857ecf/test/runner.rb:16:in `<main>'
~~~

Testing previously with commit:git|11acb7f7bc, everything was fine. I might just guess that this is related to commit:git|bfc66e07b7e0134dfa2041c311dc56941fe1caf0



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