gnome-shell crashes in meta_monitor_mode_get_resolution -> calculate_scale -> meta_monitor_calculate_mode_scale derive_calculated_global_scale -> meta_monitor_manager_rebuild_logical_monitors_derived

[errors.ubuntu.com bug bridge]

[ Impact ]

Gnome shell crashes in meta_monitor_mode_get_resolution

This seems to happen when starting gnome-shell with no display on (headless).

[ Test case ]

- Start gnome-shell in a desktop (i.e. one with no embedded display) setup
  with all the monitors off
- Gnome shell should start properly, without crashing

- Anyway monitor results in
  https://errors.ubuntu.com/problem/f66514c0f5ecdc8dceb19c76baf20adf29746f12
  to check if errors goes down

[ Regression potential ]

Scale isn't properly computed for monitors with higher DPI

---

The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-shell. This problem was most recently seen with package version 3.32.0+git20190410-1ubuntu1, the problem page at https://errors.ubuntu.com/problem/f66514c0f5ecdc8dceb19c76baf20adf29746f12 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Iain Lane (laney)]

this bug needs SRUifying too please

[Łukasz Zemczak (sil2100)]

Hello errors.ubuntu.com, or anyone else affected,

Accepted mutter into disco-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/mutter/3.32.1-2ubuntu1~19.04.1 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 and change the tag from verification-needed-disco to verification-done-disco. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-disco. 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.

[Łukasz Zemczak (sil2100)]

That's ok. For error-tracker crash fixes we're not always super strict on SRU templates, so I'm accepting it early. Would be of course nice if there is a easily reproducible test case that could be included in the description. But if not, the usual 'check for error tracker' might be enough for verification here.

[Marco Trevisan (Treviño) (3v1n0)]

This bug was fixed in the package mutter - 3.32.1-2ubuntu1

---------------
mutter (3.32.1-2ubuntu1) eoan; urgency=medium

  * Merge with debian
    - Update to 3.32.1 upstream version (LP: #1826936)
    - Fix applications aren't focused in Wayland session (LP: #1826176)
    - Fix crash on hotplugging a dock with a monitor (LP: #1826182)
    Remaining changes:
    + debian/control:
      - Update VCS flags to point to launchpad
      - Update maintainer to ubuntu
    + debian/gbp.conf: update branch to point to ubuntu/master
    + debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      - X11: Add support for fractional scaling using Randr
  * d/p/x11-Add-support-for-fractional-scaling-using-Randr.patch:
    - Fixed crash on calculation of global scale (LP: #1826933)

mutter (3.32.1-2) experimental; urgency=medium

  * Cherry-pick patches from upstream gnome-3-32 branch:
    - compositor-Destroy-window-actors-list-on-destruction.patch,
      compositor-Disconnect-from-stage-signals-on-destruction.patch: Fix crash
      when exiting. (LP: #1813716)
    - 0-initialize a struct we'll be memcmp()ing.
  * Reorder patch series so upstream patches come first (no conflicts, no
    refreshing required).

mutter (3.32.1-1) experimental; urgency=medium

  * New upstream release
  * debian/patches: disable mousekeys with Numlock ON to match the
    documentation (cherry picked from the 3.32 branch)

mutter (3.32.0+git20190410-2) experimental; urgency=medium

  [ Gunnar Hjalmarsson ]
  * Add gnome-control-center-data to Build-Depends. This package provides
    gnome-keybindings.{its,loc}. These are needed if the translation template
    is regenerated at build-time to translate the key bindings defined in
    data/50-*.xml. (LP: #1823722)

 -- Marco Trevisan (Treviño) <email address hidden> Wed, 01 May 2019 11:08:08 +0100

[Marco Trevisan (Treviño) (3v1n0)]

I was pretty sure to have marked this as a duplicate of another bug and SRU'ed that description, but I can't find it anymore :o

Anyways, i've updated the description accordingly.

[Marco Trevisan (Treviño) (3v1n0)]

No crash has been recorded by e.u.c in versions mayor than 3.32.1-2ubuntu1, so marking as verified.

[Launchpad Janitor (janitor)]

This bug was fixed in the package mutter - 3.32.1-2ubuntu1~19.04.1

---------------
mutter (3.32.1-2ubuntu1~19.04.1) disco; urgency=medium

  * Backport from eoan to disco
  * Update VCS metadata

mutter (3.32.1-2ubuntu1) eoan; urgency=medium

  * Merge with debian
    - Update to 3.32.1 upstream version (LP: #1826936)
    - Fix applications aren't focused in Wayland session (LP: #1826176)
    - Fix crash on hotplugging a dock with a monitor (LP: #1826182)
    Remaining changes:
    + debian/control:
      - Update VCS flags to point to launchpad
      - Update maintainer to ubuntu
    + debian/gbp.conf: update branch to point to ubuntu/master
    + debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      - X11: Add support for fractional scaling using Randr
  * d/p/x11-Add-support-for-fractional-scaling-using-Randr.patch:
    - Fixed crash on calculation of global scale (LP: #1826933)

mutter (3.32.1-2) experimental; urgency=medium

  * Cherry-pick patches from upstream gnome-3-32 branch:
    - compositor-Destroy-window-actors-list-on-destruction.patch,
      compositor-Disconnect-from-stage-signals-on-destruction.patch: Fix crash
      when exiting. (LP: #1813716)
    - 0-initialize a struct we'll be memcmp()ing.
  * Reorder patch series so upstream patches come first (no conflicts, no
    refreshing required).

mutter (3.32.1-1) experimental; urgency=medium

  * New upstream release
  * debian/patches: disable mousekeys with Numlock ON to match the
    documentation (cherry picked from the 3.32 branch)

mutter (3.32.0+git20190410-2) experimental; urgency=medium

  [ Gunnar Hjalmarsson ]
  * Add gnome-control-center-data to Build-Depends. This package provides
    gnome-keybindings.{its,loc}. These are needed if the translation template
    is regenerated at build-time to translate the key bindings defined in
    data/50-*.xml. (LP: #1823722)

 -- Iain Lane <email address hidden> Wed, 01 May 2019 11:32:50 +0100

[Łukasz Zemczak (sil2100)]

The verification of the Stable Release Update for mutter has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.