From 1febafabf34d357f3329235943f0d6fe81bdd1c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=A4kel=C3=A4?= <markus.makela@mariadb.com>
Date: Wed, 31 Jan 2018 09:40:29 +0200
Subject: [PATCH] Crash after double close on debug builds

When a double close is detected in a debug build, a debug assertion is
triggered. This will generate a core dump which should help investigate
the double close.
---
 server/core/dcb.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/core/dcb.cc b/server/core/dcb.cc
index 161df9dad..701159efd 100644
--- a/server/core/dcb.cc
+++ b/server/core/dcb.cc
@@ -1123,6 +1123,7 @@ void dcb_close(DCB *dcb)
         ++dcb->n_close;
         // TODO: Will this happen on a regular basis?
         MXS_WARNING("dcb_close(%p) called %u times.", dcb, dcb->n_close);
+        ss_dassert(!true);
     }
 }