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crash fails with "crash: page excluded: kernel virtual address"

This document (7023397) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 SP3

Situation

The issue affects PowerPC (ppc64le) using fadump.
 
Trying to analyze a kernel core with "crash" results in the following error:
 
This GDB was configured as "powerpc64le-unknown-linux-gnu"...

crash: page excluded: kernel virtual address: c00008f83fb535d0  type: "first list entry"

Resolution

Workaround:
 
Stopping and starting kdump.service helps:
 
# systemctl stop kdump.service
# systemctl start kdump.service
 
The kernel update to kernel version 4.4.156-94.64.1 released October 2018 includes the patch to automatically re-register fadump, if it was already registered.
 
With kernel versions prior to this, the workaround can be used.

The kdump update, kdump-0.8.16-7.22.1 released January 2020 includes the patch to re-register fadump from userspace if the kernel can't re-register fadump.

Cause

After a DLPAR operation (memory hot add/remove), fadump has to be re-registered to update the crash memory ranges.
Current udev rules are not triggered appropriately to handle this automatically and lead to a failure in capturing the complete dump and crash reports the missing pages.

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:7023397
  • Creation Date: 28-Sep-2018
  • Modified Date:09-Dec-2020
    • SUSE Linux Enterprise Server

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