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[Tomasz Cholewa <slashroot@xxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1214500 ***
    https://bugs.launchpad.net/bugs/1214500

Hi guys,

I've been struggling with similar issue in centos 6.6. In previous version (6.5) everything worked fine, but after update I wasn't able to set socket for ssh control master on overlayfs. I made some tedious research and comparisons and it turned out that it's not about the kernel (made few downgrades) but ssh.
According to https://bugzilla.redhat.com/show_bug.cgi?id=953088 in ssh version included in RHEL 6.6 (and CentOS) there was a patch witch modifies behaviour of creating control socket. When I downgraded ssh packages (openssh{,-clients,-server}) to the version without that patch (5.3p1-94.el6) everything worked like a charm!

I hope it will also help you to solve your problem in Ubuntu.


** Bug watch added: Red Hat Bugzilla #953088
   https://bugzilla.redhat.com/show_bug.cgi?id=953088

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https://bugs.launchpad.net/bugs/1262287

Title:
  SSH sockets on overlayfs report connection refused

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Reusing a master ssh socket that is created on an overlayfs mount
  reports connection refused, while on real filesystems or on tmpfs it
  works fine.

  Steps to reproduce (/var is ext4, /tmp is tmpfs.):
  # mkdir -p /var/overlayfs-socket
  # cd /var/overlayfs-socket
  # mkdir root rofs /tmp/cow
  # mount -t overlayfs -o "upperdir=/tmp/cow,lowerdir=rofs" overlayfs root
  # ssh -NMS root/socket alkisg@localhost
  alkisg@localhost's password: [****]

  And on another tab of the same terminal:
  # ssh -S root/socket alkisg@localhost ls
  Control socket connect(root/socket): Connection refused
  alkisg@localhost's password: 

  The problem is in the last line, on real filesystems or on tmpfs it
  doesn't ask for a password, it reuses the existing socket.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.12.0-7-generic 3.12.0-7.15
  ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
  Uname: Linux 3.12.0-7-generic i686
  ApportVersion: 2.12.7-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  alkisg     3511 F.... pulseaudio
   /dev/snd/controlC0:  alkisg     3511 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Dec 18 18:57:18 2013
  HibernationDevice: RESUME=UUID=5eff7bf1-95b5-4fc1-9c71-0950810c717e
  InstallationDate: Installed on 2013-10-31 (48 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20131021.1)
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-7-generic root=UUID=e1f06e01-d2dc-45e5-b446-54e1e4a5dc2c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-7-generic N/A
   linux-backports-modules-3.12.0-7-generic  N/A
   linux-firmware                            1.117
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/04/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0415
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5KPL-AM EPU
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0415:bd02/04/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5KPL-AMEPU:rvrx.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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