https://git.ruby-lang.org/ruby.git/commit/?id=d2ffd269a7

From d2ffd269a77021e6507a50995cd4af6eb5e33ea3 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Wed, 13 Jan 2021 13:45:03 -0500
Subject: [Fixes #17538] Fix assertion failure when rincgc is turned off

Co-Authored-By: Matt Valentine-House <31869+eightbitraptor@u...>
---
 gc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gc.c b/gc.c
index e21c076..c407293 100644
--- a/gc.c
+++ b/gc.c
@@ -5174,8 +5174,9 @@ gc_sweep_step(rb_objspace_t *objspace, rb_heap_t *heap) https://github.com/ruby/ruby/blob/trunk/gc.c#L5174
                 }
 	    }
 #else
-	    heap_add_freepage(heap, sweep_page);
-	    break;
+            if (heap_add_freepage(heap, sweep_page)) {
+                break;
+            }
 #endif
 	}
 	else {
-- 
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