[Bug 1169740] Re: rsyslog hangs loading modules
Launchpad Bug Tracker
1169740 at bugs.launchpad.net
Thu Apr 18 18:59:07 UTC 2013
** Branch linked: lp:ubuntu/raring-proposed/rsyslog
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https://bugs.launchpad.net/bugs/1169740
Title:
rsyslog hangs loading modules
Status in “rsyslog” package in Ubuntu:
Confirmed
Status in “rsyslog” source package in Precise:
New
Status in “rsyslog” source package in Quantal:
New
Status in “rsyslog” source package in Raring:
Confirmed
Bug description:
[Impact]
We have rsyslog configured to listen for forwarded logs on TCP and UDP, and to forward logs on to a central log host. On a number of occasions we have observed rsyslog in a hung state on our production machines -- not fowarding logs and not writing them to disk locally. It doesn't happen all the time, so I believe there's some sort of race condition involved.
I've attached a stack trace taken when the process was hung. I believe
the issue is the same as the one discussed here: http://www.gossamer-
threads.com/lists/rsyslog/users/5873 There is a patch attached to that
thread.
[Test Case]
#!/bin/sh
while [ 1 ]; do
service rsyslog stop
sleep 1
killall -9 rsyslogd > /dev/null 2>&1
service rsyslog start
sleep 1
nonce=$(date '+%s')
logger $nonce
if grep $nonce /var/log/hourly/* > /dev/null; then
echo found nonce $nonce
else
echo FAIL
exit 1
fi
done
[Regression Potential]
This is a fix for a deadlock issue it is pretty difficult to determine if fixing a race condition would impact anything else, however, testing from the community hasn't raised any concerns.
[Additional Info]
Ubuntu 12.04.1 LTS x86_64
rsyslog 5.8.6-1ubuntu8
Here is the (obscured) section of our rsyslog config that I believe is
causing the issue.
$ActionQueueType LinkedList
$ActionQueueFileName central_syslog
$ActionQueueMaxDiskSpace 256M
$ActionResumeRetryCount -1
$ActionQueueSaveOnShutdown on
$ActionSendTCPRebindInterval 100000
*.* @@central_syslog.domain:514
$ModLoad imudp
$UDPServerRun 514
$ModLoad imtcp
$InputTCPServerRun 514
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