samba - Nov 2016 - deadtime/keepalive not working as expected

My expectations are probably wrong, but I had to manually kill a process
to unlock a file when I think it should have killed itself.

I have deadtime set to 15 and keepalive at default (300).  I opened a file on
my server in Excel, then shut down the machine.  Hours later someone
tells me the file is locked.

Shouldn't keepalive have detected that the machine was off in 5 minutes?
Shouldn't deadtime have disconnected the process and unlocked the file
15 minutes later?  Do I misunderstand what is going on?  Thanks
-Ed

On Tue, Nov 01, 2016 at 05:16:47PM -0500, Ed Siefker via samba
wrote:
> My expectations are probably wrong, but I had to manually kill a process
> to unlock a file when I think it should have killed itself.
> 
> I have deadtime set to 15 and keepalive at default (300).  I opened a file
on
> my server in Excel, then shut down the machine.  Hours later someone
> tells me the file is locked.
> 
> Shouldn't keepalive have detected that the machine was off in 5
minutes?
> Shouldn't deadtime have disconnected the process and unlocked the file
> 15 minutes later?  Do I misunderstand what is going on?  Thanks
Once the client is dead the TCP keepalive's should
detect the socket is down and thus shut off the servicing
smbd. Check this by doing a wireshark capture and a
debug level 10 on that smbd.

On Tue, Nov 01, 2016 at 05:09:34PM -0700, Jeremy Allison via samba
wrote:
> On Tue, Nov 01, 2016 at 05:16:47PM -0500, Ed Siefker via samba wrote:
> > My expectations are probably wrong, but I had to manually kill a
process
> > to unlock a file when I think it should have killed itself.
> > 
> > I have deadtime set to 15 and keepalive at default (300).  I opened a
file on
> > my server in Excel, then shut down the machine.  Hours later someone
> > tells me the file is locked.
> > 
> > Shouldn't keepalive have detected that the machine was off in 5
minutes?
> > Shouldn't deadtime have disconnected the process and unlocked the
file
> > 15 minutes later?  Do I misunderstand what is going on?  Thanks
> 
> Once the client is dead the TCP keepalive's should
> detect the socket is down and thus shut off the servicing
> smbd. Check this by doing a wireshark capture and a
> debug level 10 on that smbd.
Is that still valid for SMB2? On Linux I always use socket options for
that these days:

socket options = TCP_NODELAY TCP_KEEPCNT=4 TCP_KEEPIDLE=240 TCP_KEEPINTVL=15

Volker