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Bug 247877

Summary:	dm-mirror: spinlock in write_callback has the potential for deadlock
Product:	Red Hat Enterprise Linux 5	Reporter:	Jonathan Earl Brassow <jbrassow>
Component:	kernel	Assignee:	Jonathan Earl Brassow <jbrassow>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	low	Docs Contact:
Priority:	low
Version:	5.0	CC:	lvm-team
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2008-0314	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-05-21 14:46:02 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:	247879, 425461

Description Jonathan Earl Brassow 2007-07-11 20:15:41 UTC

write_callback is in dm-raid1.c is called when an I/O completes.  It calls
spin_lock(&ms->lock).  Since write_callback could be called from either process
or interrupt context, we need to use spin_lock_irqsave().

This becomes especially important when we want to layer dm-targets that might
call bio_endio from process context.

Comment 1 RHEL Program Management 2007-08-13 14:11:58 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 Don Zickus 2007-12-21 20:17:18 UTC

in 2.6.18-62.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 5 errata-xmlrpc 2008-05-21 14:46:02 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 the 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/RHBA-2008-0314.html