https://git.ruby-lang.org/ruby.git/commit/?id=ffe58b9c8b

From ffe58b9c8bde9fa95e91a458e334b375a37ef974 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Fri, 5 Jun 2020 15:55:05 +0900
Subject: vm_ccs_push: do not cache non-heap entries

Entires not GC-able must be considered to be volatile.  Not eligible for
later use.

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 15ccf23..11e03f8 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1473,6 +1473,13 @@ vm_ccs_create(VALUE klass, const rb_callable_method_entry_t *cme) https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L1473
 static void
 vm_ccs_push(VALUE klass, struct rb_class_cc_entries *ccs, const struct rb_callinfo *ci, const struct rb_callcache *cc)
 {
+    if (! vm_cc_markable(cc)) {
+        return;
+    }
+    else if (! vm_ci_markable(ci)) {
+        return;
+    }
+
     if (UNLIKELY(ccs->len == ccs->capa)) {
         const int nsize = ccs->capa * 2;
         struct rb_class_cc_entries_entry *nents = ALLOC_N(struct rb_class_cc_entries_entry, nsize);
-- 
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