Bug 1168321

Summary:	hangs reported in mariadb / mariadb galera 5.5.40
Product:	Red Hat OpenStack	Reporter:	Michael Bayer <mbayer>
Component:	mariadb-galera	Assignee:	Michael Bayer <mbayer>
Status:	CLOSED ERRATA	QA Contact:	Ofer Blaut <oblaut>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	5.0 (RHEL 7)	CC:	aberezin, mbayer, pasik, yeylon
Target Milestone:	z4	Keywords:	Rebase, ZStream
Target Release:	5.0 (RHEL 7)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	mariadb-galera-5.5.41-2.el7ost	Doc Type:	Rebase: Bug Fixes and Enhancements
Doc Text:		Story Points:	---
Clone Of:
Clones:	1203009 (view as bug list)		Environment:
Last Closed:	2015-04-16 14:37:41 UTC	Type:	Bug
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:	1203009

Description Michael Bayer 2014-11-26 16:29:35 UTC

We've observed reports of MariaDB-Galera hangups (within individual nodes, causing the node to need to be taken offline) with version 5.5.40.  The hangups appear due to an issue identified in MariaDB itself and is introduced in MariaDB 5.5.40; the developers have posted a fix and targeted it for MariaDB 5.5.41.

Issue in MariaDB: https://mariadb.atlassian.net/browse/MDEV-7026

Detailed developer analysis: https://lists.launchpad.net/maria-developers/msg07860.html

Report of the issue specific to Galera: https://groups.google.com/forum/#!topic/codership-team/jB4aV0COkxI

Users of MariaDB 5.5.40 with or without Galera may observe sporadic, random lockups of the database server over the course of days.

Comment 4 Ofer Blaut 2015-03-18 17:33:56 UTC

Hi Michael 

How can we reproduce it  ? can't find any info in attached links

Ofer

Comment 5 Michael Bayer 2015-03-18 18:13:30 UTC

hi Ofer -

it's an extremely rare race condition, I'm not aware of reproduction steps besides the very low-level ones stated in the upstream report in https://mariadb.atlassian.net/browse/MDEV-7026

Comment 9 errata-xmlrpc 2015-04-16 14:37:41 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0825.html