--- a/src/server/util/io.c Fri Dec 30 14:15:52 2016 +0100
+++ b/src/server/util/io.c Fri Dec 30 18:47:26 2016 +0100
@@ -361,6 +361,7 @@
sstr_t buf = ucx_vasprintf(ucx_default_allocator(), format, arg);
ssize_t r = net_write(fd, buf.ptr, buf.length);
free(buf.ptr);
+ va_end(arg);
return r;
}