Kernel panic can occur when KDUMP_IMMEDIATE_REBOOT is set to "no"

This document (7018832) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 11 Service Pack 4 (SLES 11 SP4)

Situation

On SLE11 SP4 set KDUMP_IMMEDIATE_REBOOT="no" in /etc/sysconfig/kdump.  

Trigger a crash. (echo "c" > /proc/sysrq-trigger)  

The system prints the following message: "Type 'reboot -f' to reboot the system or 'exit' to boot in a normal system that still is running in the kdump environment with restricted memory!"

The system opens a shell after performing kernel dump waiting for user input. If "exit" is typed at the prompt, the system will panic.

Resolution

Possible workarounds include: 

- do not use KDUMP_IMMEDIATE_REBOOT="no" 
- run "umount /kdump/root" before exiting the shell started with KDUMP_IMMEDIATE_REBOOT="no"
- run "reboot -f"

Cause

This issue is caused by a leftover mount on /kdump/root.  The system panics after exiting the shell instead of continuing normal boot.

Disclaimer

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:7018832
  • Creation Date: 25-Apr-2017
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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