https://git.ruby-lang.org/ruby.git/commit/?id=119697f61e

From 119697f61e2b2b157816a8aa33aada5863959900 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Tue, 29 Jun 2021 14:32:28 -0400
Subject: [Bug #18014] Fix rb_gc_force_recycle unmark before sweep

If we force recycle an object before the page is swept, we should clear
it in the mark bitmap. If we don't clear it in the bitmap, then during
sweeping we won't account for this free slot so the `free_slots` count
of the page will be incorrect.
---
 gc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gc.c b/gc.c
index ff2f308..c7e3034 100644
--- a/gc.c
+++ b/gc.c
@@ -8671,7 +8671,7 @@ rb_gc_force_recycle(VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L8671
         }
         else {
 #endif
-            if (is_old || !GET_HEAP_PAGE(obj)->flags.before_sweep) {
+            if (is_old || GET_HEAP_PAGE(obj)->flags.before_sweep) {
                 CLEAR_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj);
             }
             CLEAR_IN_BITMAP(GET_HEAP_MARKING_BITS(obj), obj);
-- 
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