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 Service Pack 3 (SLES 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.

In addition a future kdump update will include a patch to re-register fadump from userspace if the kernel can't re-register fadump.
Customers affected by this issue can alternatively contact SUSE Customer Care to request such a kdump PTF.

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:03-Mar-2020
    • SUSE Linux Enterprise Server

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