From f65e2d40cc394b716d53ba80c846237c84a68cf0 Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@opensourcerouting.org>
Date: Tue, 7 Feb 2017 16:23:38 +0100
Subject: [PATCH] lib: print backtrace on MTYPE count underflow

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
---
 lib/memory.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/memory.c b/lib/memory.c
index f17915486c..5fc0088105 100644
--- a/lib/memory.c
+++ b/lib/memory.c
@@ -19,6 +19,7 @@
 #include <stdlib.h>
 
 #include "memory.h"
+#include "log.h"
 
 static struct memgroup *mg_first = NULL;
 struct memgroup **mg_insert = &mg_first;
@@ -40,6 +41,11 @@ mt_count_alloc (struct memtype *mt, size_t size)
 static inline void
 mt_count_free (struct memtype *mt)
 {
+  if (mt->n_alloc == 0)
+    {
+      zlog_err ("memory allocation count underflow for \"%s\"", mt->name);
+      zlog_backtrace (LOG_ERR);
+    }
   mt->n_alloc--;
 }