freeze on logout/shutdown (PR#664)

[Luke Kenneth Casson Leighton]

On Wed, 15 Oct 1997, Andrew Tridgell wrote:

> > we've got samba-1.9.17p2, FreeBSD 2.2-STABLE (last cvsup 6 Oct 1997) and
> > 15 workstations under Win95 (rus), Win95 OSR2 (rus) configured to make
> > domain logons to samba server (and to save user.dat etc. on network)
> > the problem is: win95 stations cannot shutdown, reboot or 'login
> > as different user' when the user is logged on from two or more
> > workstations. 
> > people reported the same problem under Solaris 2.5.1x86 and Linux
> 
> I've just fixed this bug. It was a problem in the WACK code (wait for 
> acknowledgement) in nmbd. These get produced when two machines try to
> register the same name on the network. It could also happen if one
> machine shutdown suddenly then the same user logged in again on
> another machine.

my apologies: i wrote this code about two and a half years ago, back when 
i was first working on nmbd.  i had _one_ computer, and never got round 
to testing the WACK packets.

luke