[Bug 1573558] [NEW] Upgrade window freezes when I press Ctrl+Shift+I

[Marius Gedminas]

Public bug reported:

I was upgrading my Ubuntu GNOME 15.10 system to 16.04 with update-
manager.

Note: I've the org.gtk.Settings.Debug enable-inspector-keybinding
gsetting set to true to enable the GTK+ Inspector.

I hit Ctrl+Shift+I (the key to open the GTK+ inspector) while the
upgrade window was focused, in the middle of upgrading packages.  A few
minutes later the upgrade process stopped making progress (CPU idle, no
disk I/O).  The window is not reacting to mouse clicks or key events.

pstree shows

   xenial,16938,root /tmp/ubuntu-release-upgrader-_yjo7xr4/xenial --mode=server --frontend=DistUpgradeViewGtk3
     `-(dpkg,6263)

and strace -p 16938 shows

   write(14, "pmstatus:libde265-0:16.8172:Installing libde265-0
(amd64)\n", 58

and lsof -p 16938 shows

  xenial    16938                  root   13r     FIFO               0,10      0t0    5172320 pipe
  xenial    16938                  root   14w     FIFO               0,10      0t0    5172320 pipe

while the last few terminal messages shown in the upgrade window were

  Unpacking gir1.2-atspi-2.0 (2.18.3-4ubuntu1) over (2.16.0-1ubuntu1) ...
  Processing triggers for ureadahead (0.100.0-19) ...
  Processing triggers for man-db (2.7.4-1) ...

/var/log/dist-upgrade/apt-term.log ends has those lines, and more (507
lines or 53773 bytes more), ending in

  Preparing to unpack .../libde265-0_1.0.2-2_amd64.deb ...

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Fri Apr 22 14:44:18 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-07-25 (1366 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2016-04-22 (0 days ago)
VarLogDistupgradeAptclonesystemstate.tar.gz: Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: pkexec must be setuid root
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

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https://bugs.launchpad.net/bugs/1573558

Title:
  Upgrade window freezes when I press Ctrl+Shift+I

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I was upgrading my Ubuntu GNOME 15.10 system to 16.04 with update-
  manager.

  Note: I've the org.gtk.Settings.Debug enable-inspector-keybinding
  gsetting set to true to enable the GTK+ Inspector.

  I hit Ctrl+Shift+I (the key to open the GTK+ inspector) while the
  upgrade window was focused, in the middle of upgrading packages.  A
  few minutes later the upgrade process stopped making progress (CPU
  idle, no disk I/O).  The window is not reacting to mouse clicks or key
  events.

  pstree shows

     xenial,16938,root /tmp/ubuntu-release-upgrader-_yjo7xr4/xenial --mode=server --frontend=DistUpgradeViewGtk3
       `-(dpkg,6263)

  and strace -p 16938 shows

     write(14, "pmstatus:libde265-0:16.8172:Installing libde265-0
  (amd64)\n", 58

  and lsof -p 16938 shows

    xenial    16938                  root   13r     FIFO               0,10      0t0    5172320 pipe
    xenial    16938                  root   14w     FIFO               0,10      0t0    5172320 pipe

  while the last few terminal messages shown in the upgrade window were

    Unpacking gir1.2-atspi-2.0 (2.18.3-4ubuntu1) over (2.16.0-1ubuntu1) ...
    Processing triggers for ureadahead (0.100.0-19) ...
    Processing triggers for man-db (2.7.4-1) ...

  /var/log/dist-upgrade/apt-term.log ends has those lines, and more (507
  lines or 53773 bytes more), ending in

    Preparing to unpack .../libde265-0_1.0.2-2_amd64.deb ...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Fri Apr 22 14:44:18 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-07-25 (1366 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (0 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz: Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: pkexec must be setuid root
  VarLogDistupgradeTermlog:

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