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Bug 1360159

Summary:	100% CPU utilization when SSH connections reach ~10 per second
Product:	Red Hat Enterprise Linux 7	Reporter:	Jan Kurik <jkurik>
Component:	systemd	Assignee:	systemd-maint
Status:	CLOSED ERRATA	QA Contact:	Frantisek Sumsal <fsumsal>
Severity:	high	Docs Contact:
Priority:	urgent
Version:	7.2	CC:	bblaskov, btotty, chorn, fkrska, fsumsal, jgenus, lmanasko, lnykryn, mmatsuya, myamazak, ovasik, ssahani, sshaurya, systemd-maint-list, systemd-maint, yoguma
Target Milestone:	rc	Keywords:	Regression, ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:	systemd-219-19.el7_2.13	Doc Type:	Bug Fix
Doc Text:	Previously, the cgroups-agent program used D-Bus for its messaging. Because the dbus-daemon used a backlog of 30 connections on its D-bus system bus socket, reaching the limit of 30 queued connections could consequently result in losing cgroup empty messages from further connections. This update adds a separate cgroup agent socket of the AF_UNIX/SOCK_DGRAM type, which needs no connection set up and for no listen() backlog applies. Now, if the cgroups-agent binary file cannot queue datagram messages, it does not attempt for re-connection but instead blocks the datagram messages. As a result, cgroup empty messages are no longer lost, the session scopes for an SSH connection no longer trigger a memory leak, and the load increases.	Story Points:	---
Clone Of:	1305608	Environment:
Last Closed:	2016-09-15 08:00:05 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:	1305608
Bug Blocks:

Description Jan Kurik 2016-07-26 06:51:20 UTC

This bug has been copied from bug #1305608 and has been proposed
to be backported to 7.2 z-stream (EUS).

Comment 22 errata-xmlrpc 2016-09-15 08:00:05 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-2016-1835.html