https://git.ruby-lang.org/ruby.git/commit/?id=b6d599d76e

From b6d599d76ec85422bea16b63f105985cf08e04bd Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Wed, 26 Aug 2020 12:16:17 -0400
Subject: Update heap_pages_himem after freeing pages


diff --git a/gc.c b/gc.c
index 7f48f1d..aa63cdb 100644
--- a/gc.c
+++ b/gc.c
@@ -1769,6 +1769,12 @@ heap_pages_free_unused_pages(rb_objspace_t *objspace) https://github.com/ruby/ruby/blob/trunk/gc.c#L1769
 		j++;
 	    }
 	}
+
+        struct heap_page *hipage = heap_pages_sorted[heap_allocated_pages - 1];
+        RVALUE *himem = hipage->start + hipage->total_slots;
+        GC_ASSERT(himem <= heap_pages_himem);
+        heap_pages_himem = himem;
+
 	GC_ASSERT(j == heap_allocated_pages);
     }
 }
-- 
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