https://git.ruby-lang.org/ruby.git/commit/?id=3df904d1a8

From 3df904d1a8dc614589295dfdf30a781114b3a7fc Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Thu, 6 Oct 2022 13:46:31 -0400
Subject: Add debug output to test_thrashing_for_young_objects

The test is failing only on trunk-repeat50@phosphorus-docker. This
commit adds some debugging output to debug the failure.
---
 test/ruby/test_gc.rb | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index d2f1e21e33..d69d6dd06a 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -405,7 +405,7 @@ class TestGc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_gc.rb#L405
   def test_thrashing_for_young_objects
     # This test prevents bugs like [Bug #18929]
 
-    assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-RUBY
+    assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-'RUBY'
       # Warmup to make sure heap stabilizes
       1_000_000.times { Object.new }
 
@@ -419,12 +419,15 @@ class TestGc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_gc.rb#L419
 
       after_stats = GC.stat
 
+      # Debugging output to for failures in trunk-repeat50@phosphorus-docker
+      debug_msg = "before_stats: #{before_stats}\nafter_stats: #{after_stats}"
+
       # Should not be thrashing in page creation
-      assert_equal before_stats[:heap_allocated_pages], after_stats[:heap_allocated_pages]
-      assert_equal 0, after_stats[:heap_tomb_pages]
-      assert_equal 0, after_stats[:total_freed_pages]
+      assert_equal before_stats[:heap_allocated_pages], after_stats[:heap_allocated_pages], debug_msg
+      assert_equal 0, after_stats[:heap_tomb_pages], debug_msg
+      assert_equal 0, after_stats[:total_freed_pages], debug_msg
       # Only young objects, so should not trigger major GC
-      assert_equal before_stats[:major_gc_count], after_stats[:major_gc_count]
+      assert_equal before_stats[:major_gc_count], after_stats[:major_gc_count], debug_msg
     RUBY
   end
 
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