https://git.ruby-lang.org/ruby.git/commit/?id=ac69849e49

From ac69849e49982ea83036c04c5d5f7245e3956a49 Mon Sep 17 00:00:00 2001
From: Alan Wu <alanwu@r...>
Date: Sat, 1 Aug 2020 23:05:19 -0400
Subject: Enable an assert on all configs for debugging

I'm trying to get a better understanding for rare crashes that happen on
ci:
 - http://ci.rvm.jp/results/trunk_clang_10@silicon-docker/3101898
 - http://ci.rvm.jp/results/trunk-test@ruby-sky1/2777695

Looking at the stack trace it looks like a type confusion possibly
induced by heap corruption. I'm hoping to verify this theory.

diff --git a/vm_method.c b/vm_method.c
index 2b51605..037ac2a 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -136,6 +136,7 @@ static void https://github.com/ruby/ruby/blob/trunk/vm_method.c#L136
 clear_method_cache_by_id_in_class(VALUE klass, ID mid)
 {
     VM_ASSERT(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_ICLASS));
+    if (!(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_ICLASS))) rb_bug("type confusion"); // temporary. Remove before release
 
     if (LIKELY(RCLASS_EXT(klass)->subclasses == NULL)) {
         // no subclasses
-- 
cgit v0.10.2


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