[Samba] urgent problem with samba 4.13 and chown/chgrp

Jason Keltz jas at eecs.yorku.ca
Wed Feb 10 20:49:57 UTC 2021

I'm trying to use chown/chgrp commands on files on NFS storage.

Take a file "l" that I touched:

-rw------- 1 jas tech 0 Feb 10 15:21 l

(note that user and group mapping is working perfectly)

% chgrp core l
chgrp: changing group of ‘l’: Invalid argument

The problem is not the group:

% getent group core

% wbinfo -n 'core'
S-1-5-21-1981678738-1545235886-4256466701-6765 SID_DOM_GROUP (2)

% wbinfo -Y 'S-1-5-21-1981678738-1545235886-4256466701-6765'

The problem is not the user:

% getent passwd jas


When looking at an strace of the chgrp above, I see this odd call:

fchownat(AT_FDCWD, "l", -1, 1001, 0) = -1 EINVAL (Invalid argument)

Where the third argument should be my uid 1004 and is instead -1.

In smb.conf:

idmap config * : backend = tdb
idmap config * : range = 1000000-1999999

# idmap config for the EECSYORKUCA domain
# range should match UNIX ID in AD

idmap config EECSYORKUCA : backend = ad
idmap config EECSYORKUCA : schema_mode = rfc2307
idmap config EECSYORKUCA : range = 1000-999999
idmap config EECSYORKUCA : unix_primary_group = yes
idmap config EECSYORKUCA : unix_nss_info = yes

Yes, and in /etc/nsswitch.conf:

passwd:     files winbind
shadow:     files
group:      files winbind

As a side note, if I try to change the ownership of the file, I get a 
similar behaviour.

This is a showstopper if I can't get this figured out. :( panic setting 

(I'm positive I used chown/chgrp with 4.11 successfully.)


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