From b3f8f6ab9409d3e901d22c09b0346a5a47779496 Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Thu, 4 Oct 2012 16:35:08 -0400
Subject: [PATCH] Avoid crashes at shutdown due to printf() in global
 destructors.

---
 src/util.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/util.cpp b/src/util.cpp
index 49415fc3b73..62fa4c05755 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -194,8 +194,14 @@ inline int OutputDebugStringF(const char* pszFormat, ...)
         if (fileout)
         {
             static bool fStartedNewLine = true;
-            static boost::mutex mutexDebugLog;
-            boost::mutex::scoped_lock scoped_lock(mutexDebugLog);
+
+            // This routine may be called by global destructors during shutdown.
+            // Since the order of destruction of static/global objects is undefined,
+            // allocate mutexDebugLog on the heap the first time this routine
+            // is called to avoid crashes during shutdown.
+            static boost::mutex* mutexDebugLog = NULL;
+            if (mutexDebugLog == NULL) mutexDebugLog = new boost::mutex();
+            boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
             // Debug print useful for profiling
             if (fLogTimestamps && fStartedNewLine)