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[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Seth Forshee (sforshee)

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https://bugs.launchpad.net/bugs/1605344

Title:
  Regression caused by `fuse: Add support for pid namespaces` in
  4.4.0-6.21

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  In Progress

Bug description:
  The discussion starts at
  http://thread.gmane.org/gmane.linux.kernel.cgroups/15960/focus=2269876

  Commit in the tree is:

  commit a166e6726c6e12e28ac8489ff4e2faff7065a856
  Author: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
  Date:   Wed Jul 2 16:29:19 2014 -0500

      UBUNTU: SAUCE: fuse: Add support for pid namespaces

  Description of the issue(copied from my report of lkml):

  This patch caused a regression in our major container use case with
  FUSE in Ubuntu 16.04, as patch was checked in as Ubuntu Sauce in
  Ubuntu 4.4.0-6.21 kernel.

  The use case is:
  1. Create a Docker container.
  2. Inside the container, start the FUSE backend, and mounted fs.
  3. Following step 2 in the container, create a loopback device to map
  a file in the mounted fuse to create a block device, which will be
  available to the whole system.

  It works well before this commit.

  The use case is broken because no matter which namespace losetup runs,
  the real request from loopback device seems always come from init ns,
  thus it will be in different ns running fuse backend. So the request
  will got denied, because the ns running fuse won't able to see the
  things from higher level(level 0 in fact) pid namespace.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  DistroRelease: Ubuntu 14.04
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature:
   
  Tags:  trusty
  Uname: Linux 4.4.6 x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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