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Bug 622018

Summary:	i386/i686 kernel hangs at boot on non-ACPI SMP machines
Product:	Red Hat Enterprise Linux 5	Reporter:	Tom Marshall <tdm.rhbz>
Component:	kernel	Assignee:	Prarit Bhargava <prarit>
Status:	CLOSED WONTFIX	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.5	CC:	jfeeney, jwilson
Target Milestone:	rc
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-10-17 14:34:14 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tom Marshall 2010-08-06 19:00:09 UTC

Description of problem:

When booting SMP without ACPI, the kernel may choose PIT for the clocksource.  This results in a hang at boot because PIT may not be used on SMP machines.

The fix was submitted to the 2.6.19 kernel as commit 3f4a0b917ce72ef47e438d354c433eb645218e87

Comment 1 Prarit Bhargava 2010-08-23 14:42:43 UTC

Tom, can you send me the vendor and model # of the system you're seeing this on?

I know I've seen this behaviour before ... I just can't seem to find a system to reproduce it ATM.

Thanks,

P.

Comment 2 Tom Marshall 2010-09-20 22:40:28 UTC

I do not have a publicly available machine that reproduces this issue, as we ship custom hardware.

The issue should reproduce on most hardware by specifying acpi=off in the kernel commandline.  I have just verified this using the live CD under KVM.

Comment 3 Prarit Bhargava 2011-10-17 14:34:14 UTC

Unlikely to be fixed in RHEL5.  Closing as WONTFIX.

P.