[Bug 1840122] Re: System fails to reboot from live session or ubiquity-dm

[Jean-Baptiste Lallement]

Diff between the manifests of 20190715 and 20190716.

There are 2 suspects from this list:
casper 1.413 (from 1.4.11)
linux-image 5.2.0-8.9 (from 5.0.0-20.21

** Patch added: "livecd.manifest.20190715-20190716.diff"
   https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1840122/+attachment/5282483/+files/livecd.manifest.20190715-20190716.diff

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

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

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Title:
  System fails to reboot from live session or ubiquity-dm

Status in casper package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Last known good image: Eoan Ubuntu Desktop 20190715

  Test Case:
  1. Boot eoan desktop to a live session
  2. Wait a couple of minutes until snapd settles
  3. Reboot the system from the system menu or from the command line

  Expected result:
  The system reboots

  Actual result:
  The systems fails to reboot or shutdown and displays some errors about failing to unmount /cdrom and squashfs errors in a loop.

  Unmounting /cdrom...
  [FAILED] Failed unmounting /cdrom.
  [  OK  ] Started Shuts down the "li…" preinstalled system cleanly.
  [  OK  ] Reached target Final Step.
  [  OK  ] Started Reboot.
  [  OK  ] Reached target Reboot.
  [  115.744188] print_req_error: I/O error, dev sr0, sector 1508872 flags 80700
  [  115.768139] print_req_error: I/O error, dev sr0, sector 1508872 flags 0
  [  115.771469] print_req_error: I/O error, dev loop0, sector 1501550 flags 0
  [  115.775824] SQUASHFS error: squashfs_read_data failed to read block 0x2dd2d998

  This also causes daily tests to fail.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: casper 1.414
  ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
  Uname: Linux 5.2.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.414
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug 14 08:31:30 2019
  LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190813)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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