[Samba] smb_set_file_dosmode error: BUG after update to samba4-4.4.2

[Robert K. Nelson]

We are using samba4 as an AD controller under OpenSuSE 13.2 using the 
repository at:

http://download.opensuse.org/repositories/network:/samba:/TESTING/openSUSE_13.2 


After an update to Version 4.4.2, we began getting error from our CAD 
program (SolidWorks). This happens under both Windows 7 and Windows 10.

The messages in the Samba log file are:

[2016/05/17 10:49:02.822522,  2] ../source3/smbd/open.c:1006(open_file)
   ASC\jnitz opened file 
Projects/ALI/CAD/~$ALI_Pit-8-Concept_Assy-0_MAIN_00.SLDASM read=No 
write=No (numopen=2)
[2016/05/17 10:49:02.823553,  2] 
../source3/smbd/trans2.c:6144(smb_set_file_dosmode)
   smb_set_file_dosmode: file_set_dosmode of 
Projects/ALI/CAD/~$ALI_Pit-8-Concept_Assy-0_MAIN_00.SLDASM failed 
(Operation not supported)

This file is both readable and writable using the Windows NotePad 
accessory.

There were no configuration file changes made before or after the update 
to samba4-4.4.2, and there were no changes to the CAD program, so the 
problem would seem to be associated with the update. I notice in the 
Release Notes that there were several Samba patches associated with 
preventing MITM attacks. I wonder if the problem may come from one of 
those changes.

Has anyone else seen this issue? Is there a workaround? May I provide 
more information.

Here are the results of rpm -qa | grep samba
_____________________________________________
libsamba-passdb0-4.2.3-5.1.x86_64
libsamba-passdb0-32bit-4.2.4-34.1.x86_64
libsamba-util0-32bit-4.2.4-34.1.x86_64
samba4-4.4.2-1.1.x86_64
libsamba-hostconfig0-32bit-4.2.4-34.1.x86_64
libsamba-credentials0-32bit-4.2.4-34.1.x86_64
samba-libs-32bit-4.2.4-34.1.x86_64
samba-libs-4.2.3-5.1.x86_64
samba-winbind-32bit-4.2.4-34.1.x86_64
libsamba-util0-4.2.3-5.1.x86_64
yast2-samba-server-3.1.11-2.8.1.noarch
samba-client-32bit-4.2.4-34.1.x86_64
samba-winbind-4.2.3-5.1.x86_64

Here is the header part of our smb.conf file:
____________________________________________
# Global parameters
[global]
         workgroup = ASC
         netbios name = ASCPC21
         server role = active directory domain controller
         realm = ASC.AIRFLOWSCIENCES.COM
         #dns recursive queries = yes    # although documented in a few 
places, this stanza is apparently not parsed or implemented
         allow dns updates = nonsecure
         dns forwarder = 8.8.8.8
         log file = /var/log/samba/samba4.log
         log level = 2
         idmap gid = 10000-20000
         idmap uid = 10000-20000
         security = user
         usershare allow guests = No
         usershare max shares = 100
         add machine script = /usr/sbin/useradd  -c Machine -d 
/var/lib/nobody -s /bin/false %m$
         domain logons = Yes
         domain master = Yes
         ldap admin dn =
         ldap suffix =
         local master = Yes
         os level = 65
         passdb backend = smbpasswd
         preferred master = Yes
         wins server =
         wins support = No
         vfs objects = acl_xattr
         map acl inherit = Yes
         store dos attributes = Yes
         unix extensions = no
         wide links = yes
         time server = yes

-- 
Robert K. Nelson
Airflow Sciences Corporation
12190 Hubbard Street, Livonia, MI  48150-1737
(734) 525-0300   FAX (734) 525-0303 www.airflowsciences.com