Public bug reported:

I run a samba server on an Ubuntu 14.10 host and have several ubuntu
clients as VM as well as separate device for media streaming.  On reboot
for the VM's and media streamer sometimes the samba share connects
without issue, sometimes it errors.  In all cases I can reconnect the
share with a manual mount command or a 'mount -a'.

Server process log never shows any errors, server client process logs
never show error, only errors through are on the client which are either
in dmesg output...

Status code returned 0xc0000001 NT_STATUS_UNSUCCESSFUL
CIFS VFS: Send error in SessSetup = -5
CIFS VFS: cifs_mount failed w/return code = -5

or on the cli directly after the mount command...

mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

I've had this issue for many months and believed it to be a bad config
somewhere as I could never find many other people with the similar
symptoms (google).  Today I've found a bug report on debian
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746229) with the same
problems.

I've tried lots of different parameters for the mount command to see if
any generate a different error or less frequent error but cannot see any
differents.  My current mount command for a VM which demonstrates
persistent issues is...

//blackserver.273below.co.uk/share
/mnt/share      cifs    username=XXXXX,password=XXXXX,sec=ntlm,hard
0       0

I've tried appending workgroup parameters into the mount etc and nothing
seems to resolve.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: cifs-utils 2:6.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-46.77-generic 3.13.11-ckt15
Uname: Linux 3.13.0-46-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
Date: Tue Mar 10 11:06:04 2015
InstallationDate: Installed on 2014-09-18 (172 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.3)
SourcePackage: cifs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: cifs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Attachment added: "testparm.txt"
   
https://bugs.launchpad.net/bugs/1430259/+attachment/4339809/+files/testparm.txt

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https://bugs.launchpad.net/bugs/1430259

Title:
  Mounting CIFS share intermittent failure

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