IPMI driver can be unloaded when being accessed by user space

This document (000019602) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 15 Support Pack 1


The ipmi_si driver can be unloaded when /dev/ipmi is opened by user space utilities.

On Dell EMC PowerEdge systems with SLES 15 SP1 installed, this could lead to side effects such as the following message below being logged in iDRAC System Event Log when iSM (iDRAC Service Module) is running.

iSM uses /dev/ipmi device to communicate with iDRAC and the communication may break if ipmi_si driver is unloaded and following message is logged. 
The watchdog timer expired



The issue is addressed in the following upstream commit :

ipmi: Don't allow device module unload when in use

This is resolved in SUSE Linux Enterprise Server 15 SP1 Maintenance Update Kernel version 4.12.14-197.34.1 and later  (04 Mar 2020 - the Linux Kernel 560)


Currently, it is possible to unload the driver when in use.


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:000019602
  • Creation Date: 06-Apr-2020
  • Modified Date:06-Apr-2020
    • SUSE Linux Enterprise Server

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