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Bug 869446

Summary:	Failure in ipc receive reply function can consume nearly 100% CPU resources
Product:	Red Hat Enterprise Linux 6	Reporter:	David Vossel <dvossel>
Component:	libqb	Assignee:	David Vossel <dvossel>
Status:	CLOSED ERRATA	QA Contact:	Cluster QE <mspqa-list>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	6.4	CC:	dvossel, fdinitto, jkortus
Target Milestone:	rc
Target Release:	6.4
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libqb-0.14.2-3.el6	Doc Type:	Bug Fix
Doc Text:	Cause: Timeout argument give to qb_ipcc_recv() api function is not passed to poll() while waiting for reply. Consequence: Depending on how qb_ipcc_recv() is used, this issue has the potential to consume nearly 100% CPU resources. Pacemaker is affected by this use case. Fix: Pass timeout value to poll in qb_ipcc_recv(). Result: Timeout period is honored as expected and Pacemaker's use of ipc functions correctly.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-02-21 08:38:04 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:

Description David Vossel 2012-10-23 22:33:59 UTC

Description of problem:

The ipc api function used to receive a reply (qb_ipcc_recv) does not honor the timeout period it takes in as an argument. Pacemaker depends on this timeout period to be used correctly.  There are situations in Pacemaker where incorrect behavior of qb_ipcc_recv causes Pacemaker to utilize nearly 100% cpu.

Version-Release number of selected component (if applicable):

libqb-0.14.2-1.el6

Additional info:

This issue originated on the upstream pacemaker bug tracker.
http://bugs.clusterlabs.org/show_bug.cgi?id=5110

A commit upstream to libqb has already been made to fix this.

https://github.com/asalkeld/libqb/commit/e771439

Comment 4 David Vossel 2012-11-19 21:02:18 UTC

An additional commit made upstream is required to resolve this.

https://github.com/asalkeld/libqb/commit/709b32de434ec157ec2a73153e58ffec186ae660

Comment 9 errata-xmlrpc 2013-02-21 08:38:04 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.

http://rhn.redhat.com/errata/RHBA-2013-0323.html