[Samba] winbind causing huge timeouts/delays since 4.8
slow at samba.org
Fri Feb 22 14:35:53 UTC 2019
On Fri, Feb 22, 2019 at 01:59:15PM +0100, Alexander Spannagel via samba wrote:
>I want to share some findings with the community about hugh
>timeouts/delays since upgraded to samba 4.8 end of last year and a
>patch fixing this in our setup. It would be great if someone from
>samba dev team could take a look and if acceptable apply the patch to
>the common code base. It may also affect current stable and release
>The patch expects the patch from BUG 13503 "getpwnam resolves local
>system accounts to AD" being already applied.
>Within the company i'm working for, we see frequently system
>hangs/slowness for a couple of seconds on servers using winbind
>passwd/group resolution via nsswitch.conf since we updated our OS from
>CentOS7.5 to CentOS7.6 which includes a samba update from 4.7 to 4.8.
>We could track it down to winbind and when it is asked for an unknown
>local user account. This means that the users account in question is
>not in local passwd and doesn't contain any domain like
>SOMEDOMAIN\account or account at SOMEDOMAIN. The expected behavior is an
>immediately return with an error like "no such user" or "unknown
>user", but instead a call like "id unknown" takes 60+ seconds.
hm, can't reproduce:
slow at titan:~/git/samba/scratch$ git describe
slow at titan:~/git/samba/scratch$ sudo bin/net cache flush
slow at titan:~/git/samba/scratch$ time bin/wbinfo -i foo
failed to call wbcGetpwnam: WBC_ERR_DOMAIN_NOT_FOUND
Could not get info for user foo
Can you share your full smb.conf?
Ralph Boehme, Samba Team https://samba.org/
Samba Developer, SerNet GmbH https://sernet.de/en/samba/
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