[PATCH] Fix bug #13121 - Non-smbd processes using kernel oplocks can hang smbd

[Andrew Bartlett]

On Tue, 2017-11-28 at 19:21 -0800, Jeremy Allison wrote:
> 
> I can take a look, but right now everything is pointing to
> a problem in your cloud environment. Gary, you said you'd
> been able to reproduce it - was that on a local build ?

Gary thought he did reproduce it under load (while working), but
naturally like all load-induced things it went away again.

That is the important thing we have found, our cloud finds almost all
flapping tests more often than sn-devel, not just because of how often
we run stuff, but because in general a cloud environment has higher
latency to storage (Catalyst uses CEPH for example) and there are other
users on the same hyper-visor. 

> What kernel was it ?

Linux samba-build-oplock-test-loop-abartlet-3669-no-secrets 4.4.0-98-
generic #121~14.04.1-Ubuntu SMP Wed Oct 11 11:54:55 UTC 2017 x86_64
x86_64 x86_64 GNU/Linux

I've added your key to a VM host, I'll tell you the IP in private mail.

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