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Bug 1360159 - 100% CPU utilization when SSH connections reach ~10 per second
Summary: 100% CPU utilization when SSH connections reach ~10 per second
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: systemd
Version: 7.2
Hardware: Unspecified
OS: Linux
urgent
high
Target Milestone: rc
: ---
Assignee: systemd-maint
QA Contact: Frantisek Sumsal
URL:
Whiteboard:
Depends On: 1305608
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-07-26 06:51 UTC by Jan Kurik
Modified: 2022-08-02 09:07 UTC (History)
16 users (show)

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.
Clone Of: 1305608
Environment:
Last Closed: 2016-09-15 08:00:05 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2407811 0 None None None 2016-09-15 08:15:59 UTC
Red Hat Product Errata RHBA-2016:1835 0 normal SHIPPED_LIVE systemd bug fix update 2016-09-15 11:33:48 UTC

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
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