[Samba] Samba4 high cpu load

[Günter Kukkukk]

On Monday 30 April 2012 16:04:37 steve wrote:
> On 05/04/12 00:55, Günter Kukkukk wrote:
> > On Wednesday 04 April 2012 15:33:46 steve wrote:
> >> OpenSUSE 12.1
> >> Version 4.0.0alpha19-GIT-7290a62
> >> 
> >> Upon starting, s4 burns the CPU for around 5 minutes:
> >>     PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> >>    
> >>    3672 root      20   0 72780  20m 2388 R 95.4  1.1   0:36.84 samba
> >> 
> >> After which all is well. Maybe this is just openSUSE as on Ubuntu it's
> >> less than 5 minutes (but still there).
> >> 
> >> Any ideas?
> >> Cheers,
> >> Steve
> > 
> > when i had upgraded to opensuse 12.1 some months ago, i also noticed a
> > 3 to 5 minutes hang with high CPU usage when samba4 was starting.
> > S4 was started interactively with some debug info as
> > 
> >     ./sbin/samba -i -M single -d3
> > 
> > and before the hang a strange message
> > 
> >     "WARNING! no socket to connect to"
> > 
> > was displayed.
> > 
> > Running s4 inside gdb showed the hang during startup of the internal ldap
> > service. The CPU was "hard working" inside "the GNU Multiple Precision
> > Arithmetic Library"
> > 
> >    /usr/lib/libgmp.so.10
> > 
> > Further investigation showed that pkcs11 was using the gnome-keyring
> > module
> > 
> >     /usr/lib/pkcs11/gnome-keyring-pkcs11.so
> > 
> > This module was also displaying the strange string "WARNING! no socket to
> > connect to" (see also /etc/pkcs11/modules/* )
> > Btw - i'm running KDE here.
> > 
> > I de-installed gnome-keyring and most pkcs11 related stuff - and the s4
> > hang was gone!  :-)
> > 
> > It already took me a lot of time those days - so i did no further
> > investigations ... Possibly it's enough to only de-install
> > gnome-keyring.
> > 
> > It should be noted, that samba4 is still inside its startup sequence when
> > that hang occurs, not all modules have been initialized, so s4 is not
> > able to operate properly at all during that (3 - 5 minutes) hang state!
> > 
> > Cheers, Günter
> 
> Hi
> Sorry to open this one up again but the problem with startup times on
> openSUSe remain.
> 
> The startup is now over 5 minutes. I have removed gnome keyring and the
> pkcs11 stuff.
> 
> The delay is the same interactive or not. can anyone point me in the
> right direction to trace this?
> Cheers,
> Steve

I have started again to track that down.
Will write a test applet to catch that as simple as possible, to discuss
it with the gnutls devs.

As a workaround you can use
    tls enabled = no
in the [global] section of smb.conf

I'll keep you informed about my findings.

Cheers, Günter