dmesg shows NFIT related messages after updating the kernel

This document (000019688) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP2
SUSE Linux Enterprise Server 15 SP1

Situation

When a system with NVDIMM-N/AEP is booted into SUSE Linux Enterprise Server 15 SP1, dmesg displays unknown symbol messages.
The following are examples of NVDIMM firmware interface table (NFIT) error messages that are displayed in dmesg:

Unknown symbol nvdimm_blk_region_create (err 0)
Unknown symbol nvdimm_region_notify (err 0)
Unknown symbol to_nvdimm_bus (err 0)

Resolution

These messages will no longer be seen in SUSE Linux Enterprise 15 SP2.
The "90nvdimm" module for dracut helps resolve the dependencies.

Cause

When installing the maintenance update kernel, the Dracut missed including the libnvdimm kernel module in initramfs which is a dependency for the nfit driver to load.
Since the libnvdimm driver is missing, nfit driver load fails with ‘unknown symbols’ message during early 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:000019688
  • Creation Date: 18-Aug-2020
  • Modified Date:19-Aug-2020
    • SUSE Linux Enterprise Server

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