FW: Sporadic permission denied error in Samba 4.3 and 4.4, 4.2 OK

[Youzhong Yang]

Yes, it's illumos/SmartOS system running Samba. It's possible there's some kind of bug either in kernel or in user-land programming. If you guys can point out a few critical points to put debug statements, I would be more than happy to debug the issue here.

Thanks,

--Youzhong

-----Original Message-----
From: Jeremy Allison [mailto:jra at samba.org] 
Sent: Monday, November 14, 2016 4:39 PM
To: Volker Lendecke <vl at samba.org>
Cc: Youzhong Yang <Youzhong.Yang at mathworks.com>; samba-technical at lists.samba.org
Subject: Re: FW: Sporadic permission denied error in Samba 4.3 and 4.4, 4.2 OK

On Mon, Nov 14, 2016 at 09:46:51PM +0100, Volker Lendecke wrote:
> On Mon, Nov 14, 2016 at 08:44:04PM +0000, Youzhong Yang wrote:
> > Thanks Volker. How easy is it to switch back to tdb-based messaging?
> > I can try it here. Also is it possible to debug datagram messaging 
> > to find out why it is not working?
> 
> This is probably the kernel dropping messages. It will be impossible 
> to debug under load. Going back to tdb-based messaging is a pretty 
> large effort not taken lightly. Probably sticking with 4.2 is the best 
> you can do at this point.

It also may be a Solaris/Illumos/OpenIndiana kernel bug. I haven't heard of any such issues on Linux/FreeBSD.

I wouldn't regress to tdb-messaging just yet :-).

Jeremy.