On 10/27/2011 07:58 AM, James Shupe wrote: > I have a client running a CentOS 6.0 machine with cPanel. The machine is > fully updated with both cPanel (RELEASE) and the OS. > > At first, I noticed that after cPanel's dcpumon ran (even once), > applications that depend on ps lock up and iowait jumps to around 50%. > Load averages start out around 20 when this happens and slowly crawl up > into the hundreds. Aside from not being able to run commands like ps and > some nrpe scripts, everything still seems to respond fine even with the > insanely high load. We've had it online with customers hitting it with a > load of 400 waiting for a convenient time to reboot, without complaints. > > Clarification: If you run ps, it kills your terminal session. dcpumon, > ps, etc, will hang around and you can see them under top (top doesn't > seem to be affected.) If you try to kill any of these, (-9, anything) > they do not respond. They're indefinitely blocked. They begin producing > "processes being blocked for more than 120 seconds errors" in the logs. > The server runs for days between this happening without issues and it > always seems to be related to dcpumon. > > I wrote a script that checks to see if dcpumon exists in crontab and > remove it. The script runs every minute. cPanel's automatic updates tend > to put it back every once in a while, and it's possible that updates ran > and that dcpumon ran before my script could remove it. I see that it > removed it last night (it logs removals) but don't know for sure if it > ran. It probably did. > > It's currently running 2.6.32-71.29.1.el6.x86_64 and I am considering > trying vanilla kernel build to see if that corrects the issues. The > hardware is HP DL145G3, and we have several other (non-cPanel) servers > that are identical running CentOS 6.0 without issue. > > Any ideas? Since you are using cPanel, open up a trouble ticket with them and have them take a look at it. They are usually very responsive to problems like this and may have seen this before.
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