mkdir-dup test flapping

[Andrew Bartlett]

On Mon, 2016-03-07 at 14:55 +1300, Andrew Bartlett wrote:
> On Mon, 2016-02-29 at 20:16 -0800, Jeremy Allison wrote:
> > 
> > On Tue, Mar 01, 2016 at 04:17:12PM +1300, Andrew Bartlett wrote:
> > > 
> > > 
> > > G'Day Jeremy,
> > > 
> > > In testing Samba on the Catalyst Cloud, we more often than not
> > > get
> > > a
> > > flapping test failure, rather than our real issues.  One that has
> > > come
> > > particularly to my attention is
> > > 
> > > [438(1936)/1885 at 1h5m1s] samba3.smb2.create(ad_dc)
> > > Testing SMB2 Create Directory with multiple connections
> > > waiting for replies
> > > UNEXPECTED(failure): samba3.smb2.create.mkdir-dup(ad_dc)
> > > REASON: Exception: Exception:
> > > ../source4/torture/smb2/create.c:1628:
> > > File 1 returned status NT_STATUS_ACCESS_DENIED
> > > 
> > > FAILED (1 failures, 0 errors and 0 unexpected successes in 0
> > > testsuites)
> > > 
> > > This is your code in 969d043596c0a382325d54d16dbd5e049f884fa9
> > > testing  
> > > https://bugzilla.samba.org/show_bug.cgi?id=11486
> > > 
> > > ad_dc here uses the smbd file server (no, this isn't NTVFS :-)
> > > 
> > > Can you look into this for us, and perhaps see if the code could
> > > be
> > > made more robust during the loop?  I'm very happy to get you
> > > access
> > > to
> > > a suitable machine to show the issue, but sadly it only seems to
> > > reproduce easily in a full autobuild (along with all the other
> > > flapping
> > > tests).
> > Can you get a debug level 10 log from the server showing
> > the problem ? That's probably the easiest way to track
> > this down. As I said, the client test code is really
> > simple here..
> I'll see what I can do.  We are also working to get mozilla RR
> working
> on Samba, and that will be really, really helpful for this kind of
> thing.

Attached is such a log.  I realise it is still hard to line up with the
exact failure, but hopefully you can make some sense of it.  

This was reproduced using just a one-shot run of the test on Ubuntu
14.04, and I can get you access to this VM, as it is hosted in the
Catalyst Cloud.

We got the logs by forcing smbd to run with -d10 by patching
file_server/fileserver.c.

Thanks,

Andrew Bartlett

-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba





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