SUSE Support

Here When You Need Us

printk timing issues on boot

This document (000004686) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 12SP4 for SAP


During bootup printk stack trace messages generated on console.Server times out for a period of time.


pleas execute the following command
echo '3 4 1 7' > /proc/sys/kernel/printk

To make the change persistent, we would need to do
[1] Edit "/etc/sysctl.conf" and set "kernel.printk" to 
    kernel.printk = 3 4 1 7
2] Then run "sysctl -p" to make the change effective


Default settings for printk on SLES12 SP4 is:
# /proc/sys/kernel/printk
7    4    1    7


Reported to Engineering

Additional Information

Customer saw on issue on RHEL image that had caused similar timing issues: The printk issue mentioned is related to The patch for this has been there for some time


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:000004686
  • Creation Date: 18-Feb-2020
  • Modified Date:19-Mar-2020
    • SUSE Linux Enterprise Server

< Back to Support Search

For questions or concerns with the SUSE Knowledgebase please contact: tidfeedback[at]

SUSE Support Forums

Get your questions answered by experienced Sys Ops or interact with other SUSE community experts.

Support Resources

Learn how to get the most from the technical support you receive with your SUSE Subscription, Premium Support, Academic Program, or Partner Program.

Open an Incident

Open an incident with SUSE Technical Support, manage your subscriptions, download patches, or manage user access.