I can smbmount a testshare and display its
content, but when trying to access the files, Samba panics.

Get the Loglevel 10 smbd.log at 
https://home.zhaw.ch/~kaph/smbd.log

My initial Mail to the mailinglis is at http://marc.info/?t=121239449200001&r=1&w=2

Testparm output is:
---------------------------- 8< ----------------------------

mustang3# testparm
Load smb config files from /etc/samba/smb.conf
Processing section "[testshare]"
Loaded services file OK.
Server role: ROLE_DOMAIN_MEMBER
Press enter to see a dump of your service definitions

[global]
        workgroup = ZHAW
        realm = ZHAW.CH
        server string = "Test Datenserver mustang3"
        security = ADS
        use kerberos keytab = Yes
        log level = 10
        log file = /var/log/smbd.log
        max log size = 0
        load printers = No
        local master = No
        domain master = No
        wins server = 160.85.192.200
        lock directory = /var/spool/locks
        delete veto files = Yes
        veto files = /.AppleDB/.AppleDouble/.DS_Store/.bin/.AppleDesktop/Network Trash Folder/unix/
        wide links = No

[testshare]
        comment = Testshare
        path = /var/testshare
        valid users = kaph
        read only = No
        force create mode = 0775
        force directory mode = 02775
        use sendfile = Yes
---------------------------- 8< ----------------------------