This bug has been copied from bug #515556 and has been proposed
to be backported to 5.4 z-stream (EUS).
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
When no hotpluggable PCIe slots were present on the machine, loading the 'acpiphp' module (using the '/sbin/modprobe' command) on a Nehalem EX system caused kernel panic. With these updates, an error message is produced when the aforementioned case occurs and the machine does not panic.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.