Bug 455491

Summary: backport of fix endless page faults in mount_block_root for Linux 2.6 from 2.6.26 to RHEL5-U3
Product: Red Hat Enterprise Linux 5 Reporter: Larry Woodman <lwoodman>
Component: kernelAssignee: Larry Woodman <lwoodman>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.3CC: dzickus, mgahagan, prarit
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-01-20 20:15:51 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:
Bug Depends On:    
Bug Blocks: 455409    
Attachments:
Description Flags
Patch that fixes this problem. none

Description Larry Woodman 2008-07-15 18:40:27 UTC 
Description of problem:

x86: fix endless page faults in mount_block_root for Linux 2.6

Page faults in kernel address space between PAGE_OFFSET up to
VMALLOC_START should not try to map as vmalloc.

Fix rarely endless page faults inside mount_block_root for root
filesystem at boot time.

Version-Release number of selected component (if applicable):

FRHEL5-U3

How reproducible:

The physically memory was trimmed down to 192MB to better catch the bug.
More memory gets the bug more rarely.

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

Endless pagefaulting.

Expected results:

Log error in /var.log/messages.

Additional info:
Comment 1 Larry Woodman 2008-07-15 18:40:27 UTC 
Created attachment 311865 [details]
Patch that fixes this problem.
Comment 2 Linda Wang 2008-07-31 18:59:53 UTC 
Raise as exception:

Part of x86 2.6.26 backport to RHEL5 merge. for more detail info of
the feature please see bug 455409.
Comment 3 RHEL Program Management 2008-07-31 19:02:25 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 5 Don Zickus 2008-09-19 15:39:16 UTC 
in kernel-2.6.18-116.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 8 errata-xmlrpc 2009-01-20 20:15:51 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 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.

http://rhn.redhat.com/errata/RHSA-2009-0225.html