[Samba] High cpu load on LDAP

Andrew Bartlett abartlet at samba.org
Thu Sep 29 20:14:53 UTC 2022

On Mon, 2022-09-19 at 14:04 +0000, Heinz Hölzl via samba wrote:
> hello,
> I often have the problem of high load on the LDAP processes.
> 1-3 LDAP processes cause 100% cpu load for approx. 10 sec. This
> happens
> regularly in intervals of 2-3 minutes.
> How can I find out which client is causing this load and why?
> How can I configure the logging to see who/what is causing the LDAP
> process?
> We have about 5000 users, 4000 clients in our AD with 4 DCs with
> Samba
> 4.16.4.
> thanks

I would also note the similarity with this other post on the mailing

If this is the same issue, the sockets to the client would be stuck in


Can you, on the instance with the high-cpu use, at the time it is in
that state, run (matching the commands our mailing list user has run):

Work out which PIDs are high CPU use:

netstat -avp | grep <PID>

gdb -p <PID>
bt full

strace -p <PID>

as well as a FlameGraph: 

I would love to get to the bottom of this.
Andrew Bartlett

Andrew Bartlett (he/him)       https://samba.org/~abartlet/
Samba Team Member (since 2001) https://samba.org
Samba Team Lead, Catalyst IT   https://catalyst.net.nz/services/samba

Samba Development and Support, Catalyst IT - Expert Open Source

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