Bug 468438

Summary:	List corruption in cmirror causes machine lock-up or cmirror processing stoppage
Product:	Red Hat Enterprise Linux 5	Reporter:	Jonathan Earl Brassow <jbrassow>
Component:	cmirror	Assignee:	Jonathan Earl Brassow <jbrassow>
Status:	CLOSED ERRATA	QA Contact:	Cluster QE <mspqa-list>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.3	CC:	agk, ccaulfie, cmarthal, dwysocha, edamato, heinzm, mbroz, syeghiay
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-01-20 21:26:19 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:

Description Jonathan Earl Brassow 2008-10-24 18:33:13 UTC

'commit e07369b28d7a569e742d80152ef10c9d42bc2650' introduced a bug where a tfr struct would get added to one queue (cluster_queue) before being removed from another (x->delay_queue).

This causes a variety of issues, including:
- machine hang (if clogd is in real time scheduling mode)
- LVM/dmsetup command hangs
- sync stoppage
... and any number of things that can result from corrupted list or lost requests.

Comment 1 Jonathan Earl Brassow 2008-10-27 22:58:19 UTC

commit cc5877e65fad20dd8657881a7ca7361e6e4c08bf
Author: Jonathan Brassow <jbrassow>
Date:   Fri Oct 24 13:42:06 2008 -0500

    clogd: Fix for bug 468438 - list corruption

    'commit e07369b28d7a569e742d80152ef10c9d42bc2650' introduced the
    concept of a delay queue to hold requests while membership changes
    occurred.  Sometimes, a request would be added to the delay_queue
    /and/ the cluster_queue, resulting in list corruption.  Depending
    on how the list was corrupted, infinite loops could occur, or
    requests could simply be lost.

Comment 7 errata-xmlrpc 2009-01-20 21:26:19 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/RHEA-2009-0158.html