LinuxQuestions.org
Latest LQ Deal: Linux Power User Bundle
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 06-20-2012, 05:15 PM   #1
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Rep: Reputation: Disabled
Crond eating up 100% CPU constantly


Can't seem to figure this one out, it's eating up 200% CPU (2 processors). here's top:

Code:
                                                                                                                                           
 7478 root      25   0 10212 2696 1748 R   50  0.1 321003:36 crond                                                                                                                                             
15488 root      25   0 10212 2692 1744 R   50  0.1  25888:51 crond                                                                                                                                             
20104 root      25   0 10212 2696 1748 R   50  0.1 351411:00 crond                                                                                                                                             
21474 root      25   0 10212 2696 1748 R   50  0.1  10132:38 crond
Here's: /usr/sbin/lsof -p `ps aux | grep crond | grep -v grep | awk '{print $2'}`
Code:
lsof: status error on 15488: No such file or directory
lsof: status error on 20104: No such file or directory
lsof: status error on 21474: No such file or directory
lsof: status error on 24189: No such file or directory
lsof 4.78
 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
 latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
 usage: [-?abhlnNoOPRstUvVX] [+|-c c] [+|-d s] [+D D] [+|-f]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]]
 [-p s] [+|-r [t]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [-Z [Z]] [--] [names]
Use the ``-h'' option to get more help information.
Here's tail -30 /var/log/cron
Code:
Jun 20 13:10:05 ecampweb01 crond[566]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 13:20:04 ecampweb01 crond[1195]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 13:30:02 ecampweb01 crond[1801]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 13:40:01 ecampweb01 crond[2429]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 13:50:04 ecampweb01 crond[3040]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:00:02 ecampweb01 crond[3756]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:01:04 ecampweb01 crond[3808]: (root) CMD (run-parts /etc/cron.hourly)
Jun 20 14:10:05 ecampweb01 crond[4354]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:20:03 ecampweb01 crond[4953]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:30:06 ecampweb01 crond[5647]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:40:04 ecampweb01 crond[6240]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 14:50:02 ecampweb01 crond[6875]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:00:03 ecampweb01 crond[7630]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:01:05 ecampweb01 crond[7680]: (root) CMD (run-parts /etc/cron.hourly)
Jun 20 15:10:02 ecampweb01 crond[8118]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:20:01 ecampweb01 crond[8869]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:30:05 ecampweb01 crond[9465]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:40:05 ecampweb01 crond[10073]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 15:50:05 ecampweb01 crond[10765]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:00:02 ecampweb01 crond[11370]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:01:02 ecampweb01 crond[11420]: (root) CMD (run-parts /etc/cron.hourly)
Jun 20 16:10:04 ecampweb01 crond[11978]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:20:01 ecampweb01 crond[12581]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:30:05 ecampweb01 crond[13179]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:40:04 ecampweb01 crond[13797]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 16:50:02 ecampweb01 crond[14486]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 17:00:05 ecampweb01 crond[15088]: (root) CMD (/usr/lib/sa/sa1 1 1)
Jun 20 17:01:04 ecampweb01 crond[15138]: (root) CMD (run-parts /etc/cron.hourly)
Jun 20 17:03:00 ecampweb01 crontab[15274]: (root) LIST (root)
Jun 20 17:10:03 ecampweb01 crond[15753]: (root) CMD (/usr/lib/sa/sa1 1 1)
Let me know if I can provide any further help, very frustrating trying to figure this one out
 
Old 06-20-2012, 05:25 PM   #2
szboardstretcher
Senior Member
 
Registered: Aug 2006
Location: Detroit, MI
Distribution: GNU/Linux systemd
Posts: 4,116

Rep: Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531Reputation: 1531
What is in your crontab for root?
 
Old 06-20-2012, 05:29 PM   #3
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Original Poster
Rep: Reputation: Disabled
15 3 * * * /usr/bin/updatedb
12 19 * * * /etc/webmin/cron/tempdelete.pl
#*/2 * * * * /var/www/utilfo >/dev/null 2>&1
 
Old 06-21-2012, 10:41 AM   #4
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Original Poster
Rep: Reputation: Disabled
bump
 
Old 06-21-2012, 11:46 AM   #5
maccas17
Member
 
Registered: May 2010
Location: UK
Distribution: RHEL6
Posts: 70

Rep: Reputation: 10
Have you tried restarting cron:

Code:
/etc/init.d/crond stop
/etc/init.d/crond start
One of your 3 entries is commented out, the other is updatedb, which I doubt is the cause.
What is tempdelete.pl doing? (presumably its a Perl script)
I would look at what this does and possibly comment it out.

Hope this helps.
 
Old 06-22-2012, 11:47 AM   #6
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Original Poster
Rep: Reputation: Disabled
Here's the cat of tempdelete.pl

Code:
#!/usr/bin/perl
open(CONF, "/etc/webmin/miniserv.conf");
while(<CONF>) {
        $root = $1 if (/^root=(.*)/);
        }
close(CONF);
$ENV{'WEBMIN_CONFIG'} = "/etc/webmin";
$ENV{'WEBMIN_VAR'} = "/var/webmin";
chdir("$root/cron");
exec("$root/cron/tempdelete.pl", @ARGV) || die "Failed to run $root/cron/tempdelete.pl : $!";
I don't really know perl unfortunately
 
Old 06-22-2012, 12:02 PM   #7
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Original Poster
Rep: Reputation: Disabled
Also I restarted crond just now and the CPU is at 0% for the time being, I will let you know if it spikes back!
 
Old 06-22-2012, 12:10 PM   #8
maccas17
Member
 
Registered: May 2010
Location: UK
Distribution: RHEL6
Posts: 70

Rep: Reputation: 10
Looks like it sets up the webmin environment and then runs the script from a set location with the cmd-line arguments. I don't think this is causing your issue though. I would suggest you look in all your /etc/cron.hourly .daily etc. directories and see what scripts are in there - maybe one of these is your culprit?
 
Old 06-22-2012, 12:15 PM   #9
gabriot
LQ Newbie
 
Registered: Jun 2012
Posts: 12

Original Poster
Rep: Reputation: Disabled
I didn't see anything in the hourly directly, here's the ls -l of daily:
Code:
-rwxr-xr-x 1 root root 379 Mar 28  2007 0anacron
lrwxrwxrwx 1 root root  39 Dec  6  2007 0logwatch -> /usr/share/logwatch/scripts/logwatch.pl
-rwxr-xr-x 1 root root 180 Dec  1  2007 logrotate
-rwxr-xr-x 1 root root 418 Jan  6  2007 makewhatis.cron
-rwxr-xr-x 1 root root 137 Mar 14  2007 mlocate.cron
-rwxr-xr-x 1 root root 296 Apr  3 12:52 rpm
Thanks a lot for your help so far, and my apologies for some of these questions I know they're probably pretty elementary.

Edit: Also as a side question that maybe you can answer for me - is there much danger in stopping and starting cron? I have 3 other webservers that have the same problem, and I don't want to potentially screw anything up - but if there's no harm in it I'm thinking of restarting on those other ones too considering how much this helped CPU to do so.

Last edited by gabriot; 06-22-2012 at 12:17 PM.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
OpenOffice/LibreOffice writer uses 100% CPU time, 100% memory, workaround someone? jlinkels Linux - Software 11 08-30-2012 02:50 PM
kacpid eating cpu 99% cpu time! tjclancy Linux - Software 13 09-19-2011 04:08 PM
Virtual Machines eating 100% CPU relpats_eht Linux - Software 5 11-10-2008 07:25 PM
CPU usage constantly at 100% due to application-browser and gnome-panel Perps SUSE / openSUSE 1 05-14-2007 11:55 AM
Crond Taking Almost 100% Processor Time ngwasuma Linux - Software 4 01-04-2006 10:05 AM


All times are GMT -5. The time now is 07:08 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration