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Bug 455491 - backport of fix endless page faults in mount_block_root for Linux 2.6 from 2.6.26 to RHEL5-U3
Summary: backport of fix endless page faults in mount_block_root for Linux 2.6 from 2....
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.3
Hardware: x86_64
OS: Linux
Target Milestone: rc
: ---
Assignee: Larry Woodman
QA Contact: Martin Jenner
Depends On:
Blocks: 455409
TreeView+ depends on / blocked
Reported: 2008-07-15 18:40 UTC by Larry Woodman
Modified: 2009-01-20 20:15 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2009-01-20 20:15:51 UTC
Target Upstream Version:

Attachments (Terms of Use)
Patch that fixes this problem. (deleted)
2008-07-15 18:40 UTC, Larry Woodman
no flags Details | Diff

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2009:0225 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 5.3 kernel security and bug fix update 2009-01-20 16:06:24 UTC

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):


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:
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 Product and 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

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

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.

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