p0f process - high cpu usage

sehh

Well-Known Member
Feb 11, 2006
579
6
168
Europe
Hello,

I've got a server that constantly has an issue with the process "/usr/local/cpanel/3rdparty/sbin/p0f".

This particular process gets to 100% cpu usage and gets stuck like that, until I kill it. It seems like its ok on my other servers.

Anyone has any suggestions how to tackle this issue?

Thank you.
 

sehh

Well-Known Member
Feb 11, 2006
579
6
168
Europe
Thanks for the above link. Eventually I went around all my servers and disabled this feature.

I couldn't find a lot of documentation on how to use p0f as a forensic tool.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,904
2,218
463
Hello :)

The Passive OS Fingerprinting daemon (p0f) reports the visitor's operating system and other information for email notifications. This information helps you quickly identify visitors that trigger events that cause alerts. Could you let us know the cPanel and OS versions on this server?

Thank you.
 

sehh

Well-Known Member
Feb 11, 2006
579
6
168
Europe
It started happening on a second server as well, so I had it disabled on all my servers.

They all run CentOS 6.7 with cPanel/WHM 11.54.0.21 (STABLE release channel).

I've never had an email with some sort of triggered event or alert. So I'm not sure what these are. All I ever get from my cPanel/WHM servers are the typical "upcp" emails and an occasional cron job failing due to some bug in one of the cPanel perl scripts.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,904
2,218
463
Could you open a support ticket and reference case CPANEL-2092 if you notice this on additional servers? We have an internal case open to track reports of excessive CPU usage with p0f, but have been unable to reproduce the issue on test systems.

Thank you.