Web lists-archives.com

[Samba] CPU consumption of samba rises to 100%


CPU consumption of samba rises to 100%

I am doing Achilles tests on a Linux-based server. I have noticed that
during certain tests (and UDP port discovery), the temperature of the CPU
cores surges to around 80-90 °C which causes the CPU clock to throttle and
renders the server practically unresponsive.

Following closer investigations, we found out that there is a direct link
between the rise of CPU consumption by a certain process and the CPU
temperature. In our case, the concerned process is Samba

We are using samba4 in the full active directory mode.

Environment details:

OS: Ubuntu 14.04 LTS

Samba version: 4.3.11

In our environment, there is a direct connection between the server running
Samba and the test PC; no other element in the network.

As far as we understand, this looks like a DoS attack. Certain tests render
the server completely unresponsive.

Is this a known issue? If yes, is there a fix for it?

Thank you in advance,

Ali Fahimi
Montpellier, France

Please consider the environment before printing.
To unsubscribe from this list go to the following URL and read the
instructions:  https://lists.samba.org/mailman/options/samba