Server shutdown takes a very long time

This document (7022298) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2)
SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)


On servers with a large number of mount points (inc.autofs configured mount points), the server can take a very long time to shutdown. High CPU utilization can also occur during the shutdown process.

The problem is not seen if the server is restricted to access only one CPU.


A kernel patch has been created for this issue and will be released in a maintenance kernel in the near future. Meanwhile, if this error is encountered and a patch is required, please contact SUSE Customer Care quoting this document. 


The use of the 'synchronize_rcu()' function during the shutdown process causes unacceptable delays on multi-processor boxes where many mount points are in use or defined.

Additional Information

The mentioned kernel patch, replaces the 'synchronize_rcu()' call with 'synchronize_rcu_expedited()'.

In customer testing, this patch has been shown to reduce a 6 minute shutdown time to approx. 17 seconds.

A support agreement is needed in order to obtain the patch mentioned in this document.


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7022298
  • Creation Date: 08-Nov-2017
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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