https://git.ruby-lang.org/ruby.git/commit/?id=b4daf6e28e

From b4daf6e28e4e0291e8c4c90d4ec7c0a00f715965 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Wed, 17 Aug 2022 09:38:11 -0400
Subject: Fix flaky test for GC thrashing

GC could be in an intermediate state after creating the objects, so we
should finish GC by running a minor GC.
---
 test/ruby/test_gc.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index a1e782daa9..d2f1e21e33 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -413,6 +413,10 @@ class TestGc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_gc.rb#L413
 
       1_000_000.times { Object.new }
 
+      # Previous loop may have caused GC to be in an intermediate state,
+      # running a minor GC here will guarantee that GC will be complete
+      GC.start(full_mark: false)
+
       after_stats = GC.stat
 
       # Should not be thrashing in page creation
-- 
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