From c651fd9ee3ce3d1dca7cc8dbf7648cd588255bd9 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Sat, 17 Apr 2010 11:35:05 +0200
Subject: [PATCH] Added support for Guru Mediation, and raising a guru
 mediation if refCount <= 0 but decrRefCount is called against such an object

---
 redis.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/redis.c b/redis.c
index 1bdd1421..90fe5e80 100644
--- a/redis.c
+++ b/redis.c
@@ -237,7 +237,9 @@ static char* strencoding[] = {
 
 /* We can print the stacktrace, so our assert is defined this way: */
 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
+#define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 static void _redisAssert(char *estr, char *file, int line);
+static void _redisPanic(char *msg, char *file, int line);
 
 /*================================= Data types ============================== */
 
@@ -2851,6 +2853,7 @@ static void incrRefCount(robj *o) {
 static void decrRefCount(void *obj) {
     robj *o = obj;
 
+    if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
     /* Object is a key of a swapped out value, or in the process of being
      * loaded. */
     if (server.vm_enabled &&
@@ -9859,6 +9862,15 @@ static void _redisAssert(char *estr, char *file, int line) {
 #endif
 }
 
+static void _redisPanic(char *msg, char *file, int line) {
+    redisLog(REDIS_WARNING,"!!! Software Failure. Press left mouse button to continue");
+    redisLog(REDIS_WARNING,"Guru Mediation: %s #%s:%d",msg,file,line);
+#ifdef HAVE_BACKTRACE
+    redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+    *((char*)-1) = 'x';
+#endif
+}
+
 /* =================================== Main! ================================ */
 
 #ifdef __linux__
-- 
2.45.2