Index: main/astobj2.c
===================================================================
--- main/astobj2.c	(revision 192931)
+++ main/astobj2.c	(working copy)
@@ -114,6 +114,7 @@
 	p = (struct astobj2 *) ((char *) user_data - sizeof(*p));
 	if (AO2_MAGIC != (p->priv_data.magic) ) {
 		ast_log(LOG_ERROR, "bad magic number 0x%x for %p\n", p->priv_data.magic, p);
+		ast_backtrace();
 		p = NULL;
 	}