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Bug 496102

Summary: Backport patches for snapshot store damage
Product: Red Hat Enterprise Linux 5 Reporter: Mikuláš Patočka <mpatocka>
Component: kernelAssignee: Mikuláš Patočka <mpatocka>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: high Docs Contact:
Priority: medium    
Version: 5.4CC: dzickus, emcnabb, luping.nju, mgahagan, redhatcerts
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2009-09-02 08:51:09 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:
Attachments:
Description Flags
a backported patch from upstream none

Description Mikuláš Patočka 2009-04-16 16:35:06 UTC
We need to backport changes 7c9e6c17325fab380fbe9c9787680ff7d4a51abd (dm exception store: refactor zero_area) and 7acedc5b98a2fcff64f00c21110aae7d3ac2f7df (dm exception store: fix misordered writes) from Linux 2.6.28.

There is a small time window when snapshot data on disk are inconsistent because of misordered updates. If the computer crashed at this point, the user would see damaged snapshot store after a reboot.

Comment 1 RHEL Program Management 2009-04-16 16:48:50 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 2 Mikuláš Patočka 2009-04-23 05:13:04 UTC
Created attachment 340860 [details]
a backported patch from upstream

Comment 3 Don Zickus 2009-05-06 17:17:58 UTC
in kernel-2.6.18-144.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so.  However feel free
to provide a comment indicating that this fix has been verified.

Comment 5 ESAA Admin 2009-06-25 21:16:19 UTC
What is status of QE team verifying this fix? Last update was over a month ago.

Comment 8 errata-xmlrpc 2009-09-02 08:51:09 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-2009-1243.html

Comment 9 Milan Broz 2010-06-23 15:23:37 UTC
*** Bug 481027 has been marked as a duplicate of this bug. ***