[Bug 1876506] Re: eoan to focal upgrade hangs when lvm snapshot is present

[Łukasz Zemczak]

Hello David, or anyone else affected,

Accepted memtest86+ into focal-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/memtest86+/5.01-3.1ubuntu2.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: memtest86+ (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1876506

Title:
  eoan to focal upgrade hangs when lvm snapshot is present

Status in memtest86+ package in Ubuntu:
  Fix Released
Status in os-prober package in Ubuntu:
  Confirmed
Status in memtest86+ source package in Focal:
  Fix Committed
Status in os-prober source package in Focal:
  Confirmed

Bug description:
  [Impact]
  Upgrading on LVM systems with snapshots hangs

  [Test case]

  - Install VM with eoan, LVM
  - Create snapshot of root
  - Upgrade memtest86+ to focal (download deb and apt install it is enough)

  This hangs, when it shouldn't.

  [Regression potential]
  The change to memtest86+ closes file descriptor 3 when invoking update-grub like other callers do, which fixes the issue. File descriptor 3 is the debconf socket. If update-grub would need to communicate with debconf, it couldn't anymore. But seeing that we do this everywhere else, this should be fine.

  [Original bug report]

  When upgrading from 19.10 (w/ LVM + encypted disks) to 20.04, the
  installer hangs when trying to probe an LVM snapshot volume created
  before the upgrade.

  Steps to reproduce:

  lvcreate -s -L 20G -n preupgrade /dev/vgubuntu/root
  do-release-upgrade -d

  The installer will hang after the following message:

  /usr/sbin/grub-probe: error: unknown filesystem.
  Found Ubuntu 19.10 (19.10) on /dev/mapper/vgubuntu-preupgrade
  done

  Resolution:

  Killing the grub-mount process which is probing the LVM snapshot seems
  to unhang the installer and allow the upgrade to complete without
  issue.

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