Index: include/asterisk/logger.h
===================================================================
--- include/asterisk/logger.h	(revision 432991)
+++ include/asterisk/logger.h	(working copy)
@@ -62,6 +62,17 @@
 void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
 	__attribute__((format(printf, 5, 6)));
 
+/*!
+ * \brief Used for sending a log message with protection against recursion.
+ *
+ * \note This function should be used by all error messages that might be directly
+ * or indirectly caused by logging.
+ *
+ * \see ast_log for documentation on the parameters.
+ */
+void ast_log_safe(int level, const char *file, int line, const char *function, const char *fmt, ...)
+	__attribute__((format(printf, 5, 6)));
+
 /* XXX needs documentation */
 struct ast_callid;
 
Index: include/asterisk/threadstorage.h
===================================================================
--- include/asterisk/threadstorage.h	(revision 432991)
+++ include/asterisk/threadstorage.h	(working copy)
@@ -84,6 +84,8 @@
 	AST_THREADSTORAGE_CUSTOM_SCOPE(name, NULL, ast_free_ptr,) 
 #define AST_THREADSTORAGE_EXTERNAL(name) \
 	extern struct ast_threadstorage name
+#define AST_THREADSTORAGE_RAW(name) \
+	AST_THREADSTORAGE_CUSTOM_SCOPE(name, NULL, NULL,)
 
 /*!
  * \brief Define a thread storage variable, with custom initialization and cleanup
@@ -216,4 +218,42 @@
 #define ast_threadstorage_get(ts, init_size) __ast_threadstorage_get(ts, init_size, __FILE__, __PRETTY_FUNCTION__, __LINE__)
 #endif /* defined(DEBUG_THREADLOCALS) */
 
+/*!
+ * \brief Retreive a raw pointer from threadstorage.
+ * \param ts Threadstorage object to operate on.
+ *
+ * \return A pointer associated with the current thread, NULL
+ * if no pointer is associated yet.
+ *
+ * \note This should only be used on threadstorage declared
+ * by AST_THREADSTORAGE_RAW unless you really know what
+ * you are doing.
+ */
+AST_INLINE_API(
+void *ast_threadstorage_get_ptr(struct ast_threadstorage *ts),
+{
+	pthread_once(&ts->once, ts->key_init);
+	return pthread_getspecific(ts->key);
+}
+)
+
+/*!
+ * \brief Set a raw pointer from threadstorage.
+ * \param ts Threadstorage object to operate on.
+ *
+ * \retval 0 Success
+ * \retval non-zero Failure
+ *
+ * \note This should only be used on threadstorage declared
+ * by AST_THREADSTORAGE_RAW unless you really know what
+ * you are doing.
+ */
+AST_INLINE_API(
+int ast_threadstorage_set_ptr(struct ast_threadstorage *ts, void *ptr),
+{
+	pthread_once(&ts->once, ts->key_init);
+	return pthread_setspecific(ts->key, ptr);
+}
+)
+
 #endif /* ASTERISK_THREADSTORAGE_H */
Index: include/asterisk/utils.h
===================================================================
--- include/asterisk/utils.h	(revision 432991)
+++ include/asterisk/utils.h	(working copy)
@@ -500,26 +500,8 @@
 #define ast_free free
 #define ast_free_ptr ast_free
 
-/*
- * This buffer is in static memory. We never intend to read it,
- * nor do we care about multiple threads writing to it at the
- * same time. We only want to know if we're recursing too deep
- * already. 60 entries should be more than enough.  Function
- * call depth rarely exceeds 20 or so.
- */
-#define _AST_MEM_BACKTRACE_BUFLEN 60
-extern void *_ast_mem_backtrace_buffer[_AST_MEM_BACKTRACE_BUFLEN];
-
-/*
- * Ok, this sucks. But if we're already out of mem, we don't
- * want the logger to create infinite recursion (and a crash).
- */
 #define MALLOC_FAILURE_MSG \
-	do { \
-		if (backtrace(_ast_mem_backtrace_buffer, _AST_MEM_BACKTRACE_BUFLEN) < _AST_MEM_BACKTRACE_BUFLEN) { \
-			ast_log(LOG_ERROR, "Memory Allocation Failure in function %s at line %d of %s\n", func, lineno, file); \
-		} \
-	} while (0)
+	ast_log_safe(LOG_ERROR, "Memory Allocation Failure in function %s at line %d of %s\n", func, lineno, file)
 
 /*!
  * \brief A wrapper for malloc()
Index: main/astobj2.c
===================================================================
--- main/astobj2.c	(revision 432991)
+++ main/astobj2.c	(working copy)
@@ -36,6 +36,9 @@
 #include "asterisk/cli.h"
 #include "asterisk/paths.h"
 
+/* Use ast_log_safe in place of ast_log. */
+#define ast_log ast_log_safe
+
 static FILE *ref_log;
 
 /*!
Index: main/hashtab.c
===================================================================
--- main/hashtab.c	(revision 432991)
+++ main/hashtab.c	(working copy)
@@ -43,10 +43,6 @@
 #include "asterisk/hashtab.h"
 
 
-#ifndef __AST_DEBUG_MALLOC
-void *_ast_mem_backtrace_buffer[_AST_MEM_BACKTRACE_BUFLEN];
-#endif
-
 #if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
 static void _ast_hashtab_resize(struct ast_hashtab *tab, const char *file, int lineno, const char *func);
 #define ast_hashtab_resize(a)	_ast_hashtab_resize(a,__FILE__, __LINE__, __PRETTY_FUNCTION__)
Index: main/logger.c
===================================================================
--- main/logger.c	(revision 432991)
+++ main/logger.c	(working copy)
@@ -107,6 +107,7 @@
 } logfiles = { 1 };
 
 static char hostname[MAXHOSTNAMELEN];
+AST_THREADSTORAGE_RAW(in_safe_log);
 
 enum logtypes {
 	LOGTYPE_SYSLOG,
@@ -1320,6 +1321,9 @@
 {
 	struct logmsg *next = NULL, *msg = NULL;
 
+	/* Block ast_log_safe from this thread. */
+	ast_threadstorage_set_ptr(&in_safe_log, (void*)1);
+
 	for (;;) {
 		/* We lock the message list, and see if any message exists... if not we wait on the condition to be signalled */
 		AST_LIST_LOCK(&logmsgs);
@@ -1755,6 +1759,37 @@
 	}
 }
 
+void ast_log_safe(int level, const char *file, int line, const char *function, const char *fmt, ...)
+{
+	va_list ap;
+	void *recursed = ast_threadstorage_get_ptr(&in_safe_log);
+	struct ast_callid *callid;
+
+	if (recursed) {
+		return;
+	}
+
+	if (ast_threadstorage_set_ptr(&in_safe_log, (void*)1)) {
+		/* We were already dealing with an allocation failure,
+		 * and we've failed to set the flag that protects against
+		 * recursion, so bail. */
+		return;
+	}
+
+	callid = ast_read_threadstorage_callid();
+
+	va_start(ap, fmt);
+	ast_log_full(level, file, line, function, callid, fmt, ap);
+	va_end(ap);
+
+	if (callid) {
+		ast_callid_unref(callid);
+	}
+
+	/* Clear flag so the next allocation failure can be logged. */
+	ast_threadstorage_set_ptr(&in_safe_log, NULL);
+}
+
 void ast_log_callid(int level, const char *file, int line, const char *function, struct ast_callid *callid, const char *fmt, ...)
 {
 	va_list ap;
Index: main/strings.c
===================================================================
--- main/strings.c	(revision 432991)
+++ main/strings.c	(working copy)
@@ -87,9 +87,6 @@
 			} else if (max_len == 0) {	/* if unbounded, give more room for next time */
 				need += 16 + need / 4;
 			}
-			if (0) {	/* debugging */
-				ast_verbose("extend from %d to %d\n", len, need);
-			}
 			if (
 #if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
 					_ast_str_make_space(buf, need, file, lineno, function)
@@ -97,7 +94,7 @@
 					ast_str_make_space(buf, need)
 #endif
 				) {
-				ast_verbose("failed to extend from %d to %d\n", len, need);
+				ast_log_safe(LOG_VERBOSE, "failed to extend from %d to %d\n", len, need);
 				va_end(aq);
 				return AST_DYNSTR_BUILD_FAILED;
 			}
Index: main/utils.c
===================================================================
--- main/utils.c	(revision 432991)
+++ main/utils.c	(working copy)
@@ -1998,7 +1998,7 @@
 		cur = *pool_head;
 	} else {			/* preserve the last pool */
 		if (*pool_head == NULL) {
-			ast_log(LOG_WARNING, "trying to reset empty pool\n");
+			ast_log_safe(LOG_WARNING, "trying to reset empty pool\n");
 			return -1;
 		}
 		preserve = *pool_head;