[syslog-ng] syslog-ng uses 100% cpu when i use program() destination driver

Scott McGillivray scott.mcgillivray at codemasters.com
Wed Dec 10 11:47:35 CET 2008

Hi all,

I have installed syslog-ng via apt-get on an Ubuntu 8.10 server.

I have added the below to the configuration file:

template t_smtp {
HELO localhost
MAIL From: admin at example.com
RCPT To: scott at example.com
From: admin at example.com
To: scott at example.com
Subject: Syslog msg from $HOST - [$FACILITY:$PRIORITY] $PROGRAM


log {

destination d_logfile {
        program("sendmail -bs > /var/log/syslog-email.log 2>&1"

For some reason with the above config after a message hits d_logfile the
CPU usage jumps to 100% and stays there until syslog-ng is stopped. It's
like some file it uses during the process gets locked and the thing jams
up waiting forever.

The only way to solve the problem is remove the program() entry and
replace it with file("/var/log/temp.log" template(t_smtp)); in which
case it works fine.

To test the program()destination I created a php script that just slept
for 10 seconds


And called it in d_logfile { } with program("/usr/bin/php

And sure enough the cpu jumped to 100% and stayed there until syslog-ng
was stopped.

Can anyone see a program with my above config or suggest why syslog-ng
can't cope when the program() doesn't return immediately? 


The information and attached documentation in this e-mail is intended for the use of the addressee only and is confidential. If you are not the intended recipient please delete it and notify us immediately by telephoning or e-mailing the sender. Please note that without Codemasters’ prior written consent any form of distribution, copying or use of this communication or the information in it is strictly prohibited and may be unlawful. 

Attachments to this e-mail may contain software viruses. You are advised to take all reasonable precautions to minimise this risk and to carry out a virus check on any documents before they are opened.

Any offer contained in this communication is subject to Codemasters’ standard terms & conditions and must be signed by both parties. Except as expressly provided otherwise all information and attached documentation in this e-mail is subject to contract and Codemasters’ board approval.
Any views or opinions expressed are solely those of the author and do not necessarily represent those of Codemasters.

This footnote also confirms that this email message has been swept by
SurfControl for the presence of computer viruses.

More information about the syslog-ng mailing list