[Pkg-samba-maint] Bug#849921: problem with locking in samba 4.2.14

[Jan Korbel]

Package: samba
Version: 4.2.14+dfsg-0+deb8u2

After samba jessie upgrade from 4.2.10+dfsg-0+deb8u3 to
4.2.14+dfsg-0+deb8u2 we have problem with locking files. There are some
FoxPro files/database on share and it works fine on 4.2.10. With newer
version we have permission error on second and others clients - with
same configuration.

smb.cfg:

[global]
   netbios name = XXXX-server
   workgroup = XXXX
   server string = XXXX fileserver
   dns proxy = no
   log file = /var/log/samba/samba.log
   max log size = 0
   syslog = 1
   log level = 1
   vfs objects = full_audit
   full_audit:success = connect disconnect link lock mkdir mknod rename rmdir sendfile symlink unlink write
   full_audit:failure = connect disconnect link lock mkdir mknod rename rmdir sendfile symlink unlink write pwrite
   full_audit:prefix = samba-audit %u|%I|%m|%S
   full_audit:facility = local5
   panic action = /usr/share/samba/panic-action %d
   server role = standalone server
   passdb backend = tdbsam
   obey pam restrictions = yes
   unix password sync = no
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
   pam password change = yes
   map to guest = bad user
   usershare max shares = 0
   usershare allow guests = no
   load printers = no
   printing = bsd
   printcap name = /dev/null
   disable spoolss = yes
   domain master = yes
   preferred master = yes

[share]
   path = /mnt/data/share
   browseable = yes
   writable = yes
   inherit acls = yes
   nt acl support = no
   create mask = 0700
   force create mode = 0700
   directory mask = 0770
   force directory mode = 0770

Tried some cfg changes like oplocks, kernel oplocks, veto oplock files in "global" or "share", nothing changed.
Only one known solution is samba downgrade.

Except samba packages, all others are from stable and up-to-date.

Any hints? Thanks.

J.K.

Installed packages:

hi  libsmbclient:amd64             2:4.2.10+dfsg-0+deb8u3      amd64        shared library for communication with SMB/CIFS servers
hi  python-samba                   2:4.2.10+dfsg-0+deb8u3      amd64        Python bindings for Samba
hi  samba                          2:4.2.10+dfsg-0+deb8u3      amd64        SMB/CIFS file, print, and login server for Unix
hi  samba-common                   2:4.2.10+dfsg-0+deb8u3      all          common files used by both the Samba server and client
hi  samba-common-bin               2:4.2.10+dfsg-0+deb8u3      amd64        Samba common files used by both the server and the client
hi  samba-dsdb-modules             2:4.2.10+dfsg-0+deb8u3      amd64        Samba Directory Services Database
hi  samba-libs:amd64               2:4.2.10+dfsg-0+deb8u3      amd64        Samba core libraries
hi  samba-vfs-modules              2:4.2.10+dfsg-0+deb8u3      amd64        Samba Virtual FileSystem plugins
hi  smbclient                      2:4.2.10+dfsg-0+deb8u3      amd64        command-line SMB/CIFS clients for Unix