Looking for job which is causing a large work load

[Stainforth, Matthew (SD/DS)]

It does look like you're being bitten by that bug.

You can kill off the cat processes easily enough with something like:

ps auwwx |grep "cat /sys/hypervisor/uuid" | awk '{ print $2 }' |xargs kill -9 

The cron.hourly script is calling mcelog.cron which is supplied by the mcelog package.  If you don't need that package then either remove it (yum remove mcelog) or get rid of the script from cron.hourly (or make it non-executable).

You haven't mentioned that this server is acting as a xen hypervisor so getting rid of the xen kernel if it's not needed might be a good idea, but would definitely require a reboot.  

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Margaret Doll
Sent: Tuesday, February 16, 2010 12:49 PM
To: General Red Hat Linux discussion list
Subject: Looking for job which is causing a large work load

I found the zombie to be

F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
4 Z    99  5334  5209  0  75   0 -     0 exit   ?        00:00:00  
dnsmasq <defunct>

which was started by

root      5209     1  0  2009 ?        00:00:00 libvirtd --daemon
nobody    5334  5209  0  2009 ?        00:00:00 [dnsmasq] <defunct>

I also found 622 cat programs in a sleeping state

root      2213  2211  0 Feb02 ?        00:00:00 cat /sys/hypervisor/uuid
root      2244  2242  0 Feb11 ?        00:00:00 cat /sys/hypervisor/uuid
root      2297  2295  0 Feb14 ?        00:00:00 cat /sys/hypervisor/uuid
root      2314  2312  0 Feb07 ?        00:00:00 cat /sys/hypervisor/uuid
root      2350  2348  0 Jan29 ?        00:00:00 cat /sys/hypervisor/uuid


This is described in a bug report on

https://bugzilla.redhat.com/show_bug.cgi?id=525386

 From the history of the bug report,  it show that the problem was  
resolved.  I have not been able to find the resolution.

free
              total       used       free     shared    buffers      
cached
Mem:      16099528   15190480     909048          0     491696    
11839316
-/+ buffers/cache:    2859468   13240060
Swap:      6127608     105888    6021720


ps auwwx contains a lot of

???   print progname ":\n"?????   progname="";????       }????        
{ print; }
root       677  0.0  0.0   3796   400 ?        D    Feb02   0:00 cat / 
sys/hypervisor/uuid
root       698  0.0  0.0 106652  1608 ?        S    Feb10   0:00 crond
root       699  0.0  0.0   8700  1036 ?        Ss   Feb10   0:00 /bin/ 
bash /usr/bin/run-parts /etc/cron.hourly
root       700  0.0  0.0   8700   972 ?        S    Feb10   0:00 /bin/ 
bash /etc/cron.hourly/mcelog.cron
root       701  0.0  0.0   8768   668 ?        S    Feb10   0:00 awk - 
v progname=/etc/cron.hourly/mcelog.cron progname {?????   print  
progname ":\n"?????   progname="";????       }????       { print; }
root       702  0.0  0.0   3796   400 ?        D    Feb10   0:00 cat / 
sys/hypervisor/uuid
root       773  0.0  0.0 106652  1608 ?        S    Feb06   0:00 crond
root       774  0.0  0.0   8700  1040 ?        Ss   Feb06   0:00 /bin/ 
bash /usr/bin/run-parts /etc/cron.hourly
root       775  0.0  0.0   8700   964 ?        S    Feb06   0:00 /bin/ 
bash /etc/cron.hourly/mcelog.cron
root       776  0.0  0.0   8768   672 ?        S    Feb06   0:00 awk - 
v progname=/etc/cron.hourly/mcelog.cron progname {?????   print  
progname ":\n"?????   progname="";????       }????       { print; }
root       777  0.0  0.0   3796   400 ?        D    Feb06   0:00 cat / 
sys/hypervisor/uuid
root       803  0.0  0.0 106652  1608 ?        S    Feb02   0:00 crond
root       804  0.0  0.0   8700  1036 ?        Ss   Feb02   0:00 /bin/ 
bash /usr/bin/run-parts /etc/cron.hourly
root       805  0.0  0.0   8700   972 ?        S    Feb02   0:00 /bin/ 
bash /etc/cron.hourly/mcelog.cron
root       806  0.0  0.0   8768   668 ?        S    Feb02   0:00 awk - 
v progname=/etc/cron.hourly/mcelog.cron progname {?????   print  
progname ":\n"?????   progname="";????       }????       { print; }
root       807  0.0  0.0   3796   400 ?        D    Feb02   0:00 cat / 
sys/hypervisor/uuid
root       837  0.0  0.0 106652  1608 ?        S    Feb10   0:00 crond
root       838  0.0  0.0   8700  1040 ?        Ss   Feb10   0:00 /bin/ 
bash /usr/bin/run-parts /etc/cron.hourly
root       839  0.0  0.0   8700   968 ?        S    Feb10   0:00 /bin/ 
bash /etc/cron.hourly/mcelog.cron

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