locktest - Find differences in locking between two SMB servers

locktest {//server1/share1} {//server2/share2} [-U user%pass] [-U user%pass] [-s seed] [-o numops] [-a] [-O] [-E] [-Z] [-R range] [-B base] [-M min]

locktest is a utility for detecting differences in behaviour in locking between SMB servers. It will run a random set of locking operations against //server1/share1 and then the same random set against //server2/share2 and display the differences in the responses it gets.

This utility is used by the Samba team to find differences in behaviour between Samba and Windows servers.

-U user%pass

Specify the user and password to use when logging on on the shares. This parameter can be specified twice (once for the first server, once for the second).

-s seed

Seed the random number generator with the specified value.

-o numops

Set the number of operations to perform.


Print the operations that are performed.


Backtrack to find minimal number of operations required to make the response to a certain call differ.


Enable oplocks.


Hide unlock fails.


enable exact error code checking


enable the zero/zero lock

-R range

set lock range

-B base

set lock base

-M min

set min lock length


Use kerberos

This man page is correct for version 4.0 of the Samba suite.


This utility is part of the Samba[1] suite, which is developed by the global Samba Team[2].

locktest was written by Andrew Tridgell.

This manpage was written by Jelmer Vernooij.

Samba Team
02/19/2024 Samba 4.0