Bug 677167

Summary:	kvm guests hang at startup on 32-bit AMD Athlon64 host running kernel-PAE
Product:	[Fedora] Fedora	Reporter:	Ion Badulescu <ionut>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	14	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-08-26 21:13:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Ion Badulescu 2011-02-13 20:07:51 UTC

Description of problem:
On an AMD Athlon64 host running Fedora 14 with the kernel-PAE-2.6.35.11-83.fc14.i686 kernel, starting any KVM-based VM results in a cpu spin after the console prints "Booting from Hard Disk".

Version-Release number of selected component (if applicable):
kernel-PAE-2.6.35.11-83 or kernel-PAE-2.6.35.10-74

How reproducible:
Always

Steps to Reproduce:
1. Boot into one of the above kernels
2. Try to start a KVM-based VM
3.
  
Actual results:
The VM boot process stops after the BIOS prints the messages "Booting from Hard Disk". qemu-kvm shows up in top as spinning at 100% cpu.

Expected results:
Getting the guest up and running.

Additional info:
This kernel bugzilla entry tracks this very bug, and I can confirm that the patch f87f928882d080eaec8b0d76aecff003d664697d applies cleanly to the kernel-2.6.35.11-83 source rpm and fixes the problem:

https://bugzilla.kernel.org/show_bug.cgi?id=25262

Please include this patch in a future kernel rpm release. For now I'm forced to use my customized kernels which include this patch.

Comment 1 Chuck Ebbert 2011-02-15 17:26:29 UTC

Patch will be in 2.6.35.11-85