Bug 245585

Summary:	kexec/xen machines may oops in case highmem is present
Product:	Red Hat Enterprise Linux 5	Reporter:	Linda Wang <lwang>
Component:	kernel	Assignee:	Gerd Hoffmann <kraxel>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	low	Docs Contact:
Priority:	low
Version:	5.0	CC:	dzickus
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2007-0959	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-07 19:54:18 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 Linda Wang 2007-06-25 15:37:07 UTC

Description of problem:
As reported by Stephen kexec/xen machines may oops in case highmem is present,
i.e. on 32bit machines with more than of 1GB memory

Version-Release number of selected component (if applicable):
2.6.18-31.el5

How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

This patch fixes it by disabling highmem allocations in the xen case. It is one
of multiple possible ways to fix it.  It's not yet fixed upstream.  The patch
attached has the advantage that it (a) is very simple and (b) has been in the
.kraxel.8 + newer xen test kernels and thus has seen quite some test coverage.

Comment 2 RHEL Program Management 2007-06-25 15:45:47 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 4 Don Zickus 2007-06-27 15:57:32 UTC

in 2.6.18-32.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 7 errata-xmlrpc 2007-11-07 19:54:18 UTC

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 the 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.

http://rhn.redhat.com/errata/RHBA-2007-0959.html