[Bug 1641308] Re: Partitions display wrong in gnome -disks - ok in gparted

[Robie Basak]

> * Regression potential
> check that partitions handling is still working correctly in g-d-u

Yes, but I think some more detail is required here. An accidental
regression caused by this patch could lead to data loss.

Please see https://wiki.ubuntu.com/StableReleaseUpdates#Procedure - we
need "a discussion of how regressions are most likely to manifest, or
may manifest even if it is unlikely, as a result of this change" and
(implied) thoughts towards specifically what needs to be tested based on
that discussion.

I've accepted the patch into proposed as it seems correct and important
to fix, but I don't think this should be accepted into bionic-updates
after SRU verification until the documented regression mitigation steps
are completed in full.

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Title:
  Partitions display wrong in gnome -disks - ok in gparted

Status in parted package in Ubuntu:
  Fix Released
Status in parted source package in Xenial:
  Triaged
Status in parted source package in Bionic:
  Fix Committed

Bug description:
  * Impact

  gnome-disk-utility sometime displays the wrong partitons informations

  
  * Test case

  On a system with an extended partition start gparted, close it and
  start gnome-disk-utility, the layout displayed should be correct

  
  * Regression potential
  check that partitions handling is still working correctly in g-d-u

  --------------------

  The partitions displayed by gnome-disk-utility are wrong. When i use
  gparted the partitions displayed are correct.

  The display became wrong after i deleted 1 partition from the disk
  using gnome-disk-utility.

  Here is a screenshot of the 2 tools vision of the same disk:
  http://pasteboard.co/PjWpqeNzi.png

  Here is the fdisk:
  hippo at hippo-camp:~$ sudo fdisk -l
  [sudo] password for hippo:
  Disk /dev/sdc: 465,8 GiB, 500107862016 bytes, 976773168 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0x1c0966b0

  Device     Boot     Start       End   Sectors   Size Id Type
  /dev/sdc1  *           63 758587953 758587891 361,7G  7 HPFS/NTFS/exFAT
  /dev/sdc3       758589438 903041023 144451586  68,9G  5 Extended
  /dev/sdc5       758589440 903041023 144451584  68,9G 83 Linux

  hippo at hippo-camp:~$ lsb_release -rd
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  gnome-disk-utility:
    Installed: 3.18.3.1-1ubuntu1
    Candidate: 3.18.3.1-1ubuntu1
    Version table:
   *** 3.18.3.1-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  gparted:
    Installed: 0.25.0-1
    Candidate: 0.25.0-1
    Version table:
   *** 0.25.0-1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  I get *very nervous* when tools that have write access to partitions
  can't display them properly.

  Good hunt
  Matt

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gnome-disk-utility 3.18.3.1-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
  Uname: Linux 4.4.0-47-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Nov 12 12:16:39 2016
  ExecutablePath: /usr/bin/gnome-disks
  InstallationDate: Installed on 2016-10-11 (31 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  SourcePackage: gnome-disk-utility
  UpgradeStatus: No upgrade log present (probably fresh install)

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