Bug 119287

Summary:	/etc/log.d/scripts/services/kernel uses excessive memory
Product:	[Fedora] Fedora	Reporter:	Russell Coker <russell>
Component:	logwatch	Assignee:	Ivana Varekova <varekova>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2005-06-29 13:05:55 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Russell Coker 2004-03-29 02:22:00 UTC

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Description of problem:
When the /var/log/messages file is significantly larger than RAM (EG 400M log file and 256M of RAM) the /etc/log.d/scripts/services/kernel script takes enough memory to make the machine thrash (in this case 500M of RAM).  At 12:00 I noticed that the /etc/log.d/scripts/services/kernel script had been running since ~4AM and was showing no signs of completion.

Presumably if the messages file was 800M in size on a machine with 256M of RAM then the day's logs would take more than a day to process...

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


How reproducible:
Didn't try

Steps to Reproduce:
Have iptables rules that block all outbound connections, then have someone login to your machine and run a portscanner for 8 hours that attempts connections as fast as possible.

Then wait for the cron job to run and use all memory in the machine and a lot of swap.

Expected Results:  I expect that the cron job won't try and read a 400M log file into memory.

Additional info:

Comment 1 Ivana Varekova 2005-06-28 13:22:27 UTC

Hello, I try to reproduce your bug but I was not succesfull. My logwatch works
right. I test the last logwatch version (logwatch-6.1.2-1). 
Could you please test this logwatch version.

Ivana Varekova

Comment 2 Russell Coker 2005-06-28 15:01:58 UTC

# /etc/cron.daily/00-logwatch 
system /bin/cat /var/log/messages  2>/dev/null 
>/tmp/logwatch.9RJkbpug/sonicwall failed: 256 at /etc/cron.daily/00-logwatch 
line 707. 
# 
 
Above is an error I received while testing this with a data set that is larger 
than the file system for /tmp.

Comment 3 Russell Coker 2005-06-28 17:00:44 UTC

I haven't been able to reproduce the original problem, it may have been fixed 
so I'll open a new bugzilla if I can reproduce it. 
 
For the moment please consider comment #2 as the only remaining on this 
bugzilla.

Comment 4 Ivana Varekova 2005-06-29 13:05:55 UTC

I can't reproduce your problem in comment 2. So I close this bug.