Bug#27344 Total failure to start the server

 - length($sockdir) >= 80 !!

mysql-test/mysql-test-run.pl

@@ -1070,7 +1070,7 @@ sub command_line_setup () {
   # On some operating systems, there is a limit to the length of a
   # UNIX domain socket's path far below PATH_MAX, so try to avoid long
   # socket path names.
-  $sockdir = tempdir(CLEANUP => 0) if ( length($sockdir) > 80 );
+  $sockdir = tempdir(CLEANUP => 0) if ( length($sockdir) >= 80 );
 
   $master->[0]=
   {