[Bug 1666843] Re: Regular recoverable disconnections over SAMBA on OSX clients

[Nish Aravamudan]

Hello and thank you for filing this bug report!

This does seem like a real bug, but it might be quite tricky to debug,
as there are several different axis to consider.

Is it possible to:

a) Reproduce this without ZFS (just for testing, in a separate share)

b) Reproduce this with newer Ubuntu (just for testing, yakkety would be
interesting, but zesty is probably better initially, only because we
need to ensure it is fixed in the latest release).

c) Does it happen to Ubuntu Samba clients? Or only MacOS? Is it possibly
a bug in MacOS?

d) I don't know much about networking itself, but if we could remove the
nuances of the local configuration and reproduce it with a simple setup
(one server and one client on a single switch using a standard
filesystem backing the NFS share), then I think we can more readily
debug the issue.

Thanks!
-Nish

** Changed in: samba (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1666843

Title:
  Regular recoverable disconnections over SAMBA on OSX clients

Status in samba package in Ubuntu:
  Triaged

Bug description:
  On Ubuntu 16.04.02 running SAMBA 4.3.11, various OS X (or macOS now)
  clients have issues with our SAMBA server which uses ZFS as the
  filesystem.

  During their regular work, it seems nothing that can be pinned down,
  every share the system is connected to will disconnect with a
  notification from macOS. This occurs on our Yosemite, El Cap, and
  Sierra clients. The systems can be remounted immediately without
  needing a reboot or resetting services.

  This happens anywhere between once and many times a day, but there is
  not a day that goes by where it doesn't happen once.

  The ZFS pool is basic but large (10 pools of 10 disks in a z2), and
  there is a 128GB of ram dedicated to caching. There have been no
  reported issues with ZFS that I can see. No errors, missing devices,
  corruption, etc... The pool is set xattr=sa.

  As you can see from the attached smb.conf, fruit is active and
  configured. We have tried countless variations of the smb.conf but
  COULD have missed something, so invite enquiries there.

  More details: The server is connected over a lagged connection to a
  switch then served to the clients. Some clients are connecting through
  a Dell switch and some through a Supermicro switch, both with their
  own LAG. This doesn't seem to matter.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: samba 2:4.3.11+dfsg-0ubuntu0.16.04.3
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Wed Feb 22 20:45:15 2017
  InstallationDate: Installed on 2017-02-02 (19 days ago)
  InstallationMedia: ShareOS 16.04.1 2017.02.01 amd64 "ShareOS Xenial"
  NmbdLog:

  OtherFailedConnect: Yes
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SambaServerRegression: No
  SmbConfIncluded: Yes
  SmbLog:

  SourcePackage: samba
  UpgradeStatus: No upgrade log present (probably fresh install)

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