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[Launchpad Bug Tracker <1656369@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package curtin - 0.1.0~bzr460-0ubuntu1~16.04.1

---------------
curtin (0.1.0~bzr460-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * New upstream snapshot.
    - Install zipl in target on s390x arch. (LP: #1662346)
    - avoid UnicodeDecode error on passing non-utf8 into shlex
    - adjustments to version string handling, improved pack unit tests.
    - helpers/common: Add grub install debugging output
    - curtin: add version module and display in output and logs
    - content decoding in load_file, apply_net raise exception on errors
    - gpg: retry when recv'ing gpg keys fail (LP: #1661337)
    - Add clear_holders checks to disk and partition handlers (LP: #1659509)
    - net: add new lines after rendered static routes. (LP: #1649652)
    - multipath: don't run update-grub; setup_grub will handle this better.
      (LP: #1656369)
    - Test changes:
      - vmtest: Add tests for zesty and Trusty HWE-X kernels.
      - tests: fix tox tip-pycodestyle complaints
      - image-sync: add debugging output to help diagnose errors
      - vmtest: change get_curtin_version to use version subcommand.
      - Remove style checking during build and add latest style checks to tox
      - subp doc an unit test improvements.
      - flake8: remove unused variable.
      - vmtest: Add the ability to add extra config files to test execution.
      - vmtest: overhaul image sync
      - vmtest: skip apt-proxy test if not set
      - vmtest: add 'webserv' helper
      - vmtest: add CURTIN_VMTEST_CURTIN_EXE variable.

 -- Scott Moser <smoser@xxxxxxxxxx>  Wed, 08 Feb 2017 19:40:38 -0500

** Changed in: curtin (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1656369

Title:
  os-prober will double mount multipath partitions

Status in curtin package in Ubuntu:
  Fix Released
Status in os-prober package in Ubuntu:
  New
Status in curtin source package in Xenial:
  Fix Released
Status in os-prober source package in Xenial:
  New
Status in curtin source package in Yakkety:
  Fix Released
Status in os-prober source package in Yakkety:
  New

Bug description:
  ==== Begin SRU Template ========
  [Impact]
  During an update-grub in the target system when using multipath
  the 'os-prober' tool used to discover other operating systems
  to add to the grub menu does not handle duplicate paths and
  mounts the same disk up twice causing unknown behavior which
  sometimes results in timeouts during installation.

  [Test Case]
  This failure was transient, but the test cases that showed the
  failure were 
   tests/vmtests/test_multipath.py

  So to verify fix, best path is to just run vmtest successfully.

  [Regression Potential] 
  Likeliest failure path would be for multipath installation to
  not boot, or fail to install.

  [Other Info]
  ==== End   SRU Template ========


  
  1. % lsb_release -rd
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  2. % apt-cache policy os-prober
  os-prober:
    Installed: 1.70ubuntu3
    Candidate: 1.70ubuntu3
    Version table:
   *** 1.70ubuntu3 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  3. os-prober should skip over multipath partitions

  4. os-prober only skips currently mounted partitions and ends up
  mounting the same filesystem a second time with grub-mount; sometimes
  this results in corrupt reads from /var/lib/os-
  prober/<mount>/boot/grub/grub.cfg  which results in undefined but
  broken behavior

  On multipath systems, you have two block devices pointing to the same
  disk;  when we create and mount a filesytem on one (/dev/sda1) we also
  see the results on a second device (/dev/sdb1)

  grub hooks to calling os-prober which checks /proc/mounts for mounted
  partitions; it skips /dev/sda1, but when checking if /dev/sdb1 is
  mounted, its not listed in /proc/mounts and then continues to call
  grub-mount on /dev/sdb1; this uses grub-fuse to mount the disk a
  second time.

  Even if multipath-tools and the module (dm-multipath) are not loaded,
  it is possible to detect multipath by examining the FSUUID on the
  block devices, blkid for example, will show that /dev/sda1 and
  /dev/sdb1 have the same UUID.

  There is a patch for skipping multipath but requires multipathd and
  the dm-multipath module to be loaded.

  https://build-test.opensuse.org/package/view_file/home:coolo:test/os-
  prober/os-prober-skip-part-on-multipath.patch?expand=1

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: os-prober 1.70ubuntu3
  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: 2.20.1-0ubuntu2.4
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:GNOME
  Date: Fri Jan 13 11:17:25 2017
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu5
   libgcc1 1:6.0.1-0ubuntu1
  InstallationDate: Installed on 2016-01-01 (378 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151209)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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