Index: mmap.c
===================================================================
--- mmap.c	(revision 192945)
+++ mmap.c	(working copy)
@@ -240,7 +240,8 @@ backtrace_vector_release (struct backtra
   aligned = (size + 7) & ~ (size_t) 7;
   alc -= aligned - size;

-  backtrace_free (state, (char *) vec->base + size, alc, error_callback, data);
+  backtrace_free (state, (char *) vec->base + aligned, alc,
+		  error_callback, data);
   vec->alc = 0;
   return 1;
 }