Bug 442579 - Backport fix for possible data corruption in mark_buffer_dirty on SMP
Backport fix for possible data corruption in mark_buffer_dirty on SMP
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
: rc
: ---
Assigned To: Mikuláš Patočka
Martin Jenner
Depends On: 442577
Blocks: 461304
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Reported: 2008-04-15 12:50 EDT by Mikuláš Patočka
Modified: 2009-05-18 15:32 EDT (History)
13 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2009-05-18 15:32:32 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2009:1024 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 4.8 kernel security and bug fix update 2009-05-18 10:57:26 EDT

  None (edit)
Description Mikuláš Patočka 2008-04-15 12:50:20 EDT
+++ This bug was initially created as a clone of Bug #442577 +++

Description of problem:

Function mark_buffer_dirty() contains SMP-unsafe optimization. If CPU reorders
instructions in certain way, it may cause that modified data are not written and
filesystem corruption happens.

For discussion, see the thread at

There are several possible fixes with different performance and complexity (see
the thread), the one that went into upstream kernel is this:

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

How reproducible:
Can't be reproduced, was found during source code review.
If data corruption because of this bug ever happened, it would be very hard to
link the corruption to this problem --- so maybe it would be better to fix the
bug preemtively.
Comment 1 RHEL Product and Program Management 2008-04-15 14:09:56 EDT
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 2 RHEL Product and Program Management 2008-09-03 09:10:23 EDT
Updating PM score.
Comment 3 Vivek Goyal 2008-09-12 15:58:05 EDT
Committed in 78.9.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/
Comment 6 errata-xmlrpc 2009-05-18 15:32:32 EDT
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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