Bug 639412 – block: must prevent merges of discard and write requests [rhel-6.0.z]

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Bug 639412 - block: must prevent merges of discard and write requests [rhel-6.0.z]

Summary:	block: must prevent merges of discard and write requests [rhel-6.0.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.1
Hardware:	All Linux

Priority	urgent Severity urgent
Target Milestone:	rc
Target Release:	---
Assigned To:	Frantisek Hrbata
QA Contact:	Gris Ge
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	637805
Blocks:
	Show dependency tree / graph

Reported:	2010-10-01 13:05 EDT by RHEL Product and Program Management
Modified:	2010-11-11 06:55 EST (History)
CC List:	18 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-71.3.1.el6
Doc Type:	Bug Fix
Doc Text:	Previously, a write request may have merged with a discard request. This could have posed a potential risk for 3rd party drivers which could possibly issue a discard without waiting properly. With this update, discarding of write block I/O requests by preventing merges of discard and write requests in one block I/O has been introduced, thus, resolving the possible risks.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2010-11-10 14:10:43 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2010:0842	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2010-11-22 14:34:20 EST

Groups: None (edit)

Description RHEL Product and Program Management 2010-10-01 13:05:23 EDT

This bug has been copied from bug #637805 and has been proposed
to be backported to 6.0 z-stream (EUS).

Comment 2 Frantisek Hrbata 2010-10-04 03:14:37 EDT

in 2.6.32-71.3.1.el6

Comment 5 Barry Donahue 2010-10-21 10:58:06 EDT

The bug was found upstream and there is no reproducible test case.

Comment 7 errata-xmlrpc 2010-11-10 14:10:43 EST

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-2010-0842.html

Comment 8 Martin Prpič 2010-11-11 06:55:06 EST

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously, a write request may have merged with a discard request. This could have posed a potential risk for 3rd party drivers which could possibly issue a discard without waiting properly. With this update, discarding of write block I/O requests by preventing merges of discard and write requests in one block I/O has been introduced, thus, resolving the possible risks.

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