Gnome-shell crash after turn display off in mutter 3.36.6-ubuntu0.20.04.1 (NVIDIA)

[Cristiano Fraga G. Nunes]

In Ubuntu 20.04.1 [focal-proposed]:

[ Impact ]
GNOME Shell crash after updating mutter to version 3.36.6-ubuntu0.20.04.1.
With the old version (3.36.4-0ubuntu0.20.04.1) and (3.36.4-0ubuntu0.20.04.2), all works fine.

[ Test case ]
Steps to reproduce the error:
1) Lock screen;
2) Turn off the display;
3) Turn on the display;

And the Gnome Shell crash and show us a blank screen with the message:
"Oh no! Something has gone wrong."

[ Regression potential ]
This very fix was already handled as part of bug #1889090 and we had no regression report,.

However, one possible is that the screen size is not set properly for the session, or that panning is enabled.

[ Workaround ]
Downgrade the libmutter package temporarily.

ProblemType: BugDistroRelease: Ubuntu 20.04
Package: mutter 3.36.6-1ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-49.53-generic 5.4.65
Uname: Linux 5.4.0-49-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 23 15:57:17 2020
InstallationDate: Installed on 2020-08-15 (38 days ago)
InstallationMedia: Ubuntu 20.04.1 2020.08.15 LTS "Custom Focal Fossa" (20200815)SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2020-08-15T17:44:36

[Cristiano Fraga G. Nunes (cfgnunes)]

See also:

https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1892440

[Cristiano Fraga G. Nunes (cfgnunes)]

In my syslog:

gnome-shell[3407]: mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size: assertion failed: (width > 0 && height > 0 && scale > 0)

gnome-shell[3407]: Bail out! mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size: assertion failed: (width > 0 && height > 0 && scale > 0)

[Cristiano Fraga G. Nunes (cfgnunes)]

I've tested in a fresh install also.

[Marco Trevisan (Treviño) (3v1n0)]

Oh, crazy... This was supposed to be fixed already, looks like something broke when adapting the patch?!

[Marco Trevisan (Treviño) (3v1n0)]

I mean, this looks like bug #1889090 is back..

[Marco Trevisan (Treviño) (3v1n0)]

Thanks for making the bug SRU compliant, I've uploaded a new version.

In the mean time you can probably test it using the ppa at
 https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4267

[Cristiano Fraga G. Nunes (cfgnunes)]

Thanks, Trevinho! ;)

[Cristiano Fraga G. Nunes (cfgnunes)]

I've tested the mutter 3.36.6-1ubuntu0.20.04.2~wip1 (in the PPA).

Now, all works fine!

Thanks for your attention and work.

[Brian Murray (brian-murray)]

Hello Cristiano, or anyone else affected,

Accepted mutter into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/mutter/3.36.6-1ubuntu0.20.04.2 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.

[Cristiano Fraga G. Nunes (cfgnunes)]

Hi, Brian and Marco,

I've tested the mutter 3.36.6-1ubuntu0.20.04.2 (from "focal-proposed" repository).

Now, all works fine! Without problems.
Thanks for your attention and work! :)

[Launchpad Janitor (janitor)]

This bug was fixed in the package mutter - 3.36.6-1ubuntu0.20.04.2

---------------
mutter (3.36.6-1ubuntu0.20.04.2) focal; urgency=medium

  * xrandr-scaling: Never try to set invalid screen sizes (again!)
    Looks like this change (introduced to fix LP:1889090) got lost while
    rebasing previous fixes, gbp has been a bad guy this time! (LP: #1896818)

mutter (3.36.6-1ubuntu0.20.04.1) focal; urgency=medium

  * Merge with debian, containing new stable release (LP: #1896332)
  * debian/patches:
    - Refresh patches and drop applied ones
    - Don't set the font-dpi on clutter-backend-x11 (LP: #1892440)
    - Cherry-pick upstream night-switch fixes for 3.36 branch
    - Cherry-pick upstream fixes for handling X11 devices removal
      (LP: #1558886)
  * xrandr-scaling: Don't update UI scale factor on xrandr-manager creation
    (LP: #1892440)
  * debian/control: Revert pipewire version bumping
  * Remaining changes with debian:
    - debian/control:
      + Update VCS flags to point to ubuntu salsa branch
    - 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

mutter (3.36.6-1) unstable; urgency=medium

  * Team upload
  * New upstream release
  * Update symbols file
  * d/control.in, d/rules: Enable Pipewire on Debian (but not Ubuntu).
    Now that we have Pipewire 0.3, we can enable screencasting and remote
    desktop support again.

mutter (3.36.5-1) unstable; urgency=medium

  * Team upload
  * New upstream release
    - Screencast fixes and improvements
    - Fix glitches when subsurfaces extend outside the toplevel
    - Improve background display in overview workspace switcher
    - Fix wine copy & paste
    - Plug memory leaks
  * Drop patches that were applied upstream

mutter (3.36.4-1) unstable; urgency=medium

  * New upstream stable release (LP: #1887998)
    - Fix crash on area screenshots with fractional scaling
    - Do not paint textures of fully obscured windows
    - Turn off CRTCs as well when enabling DPMS
    - Improve selection support
    - Use a more appropriate combine function on opaque areas
    - Fix remote desktop being broken without screencast session
    - Fix popovers disappearing on wayland and HiDPI
    - Fixed crashes (LP: #1870867, LP: #1857947)
    - Plugged memory leaks
  * d/p/screen-cast-Let-the-reason-for-recording-determine-what-t.patch,
    d/p/screen-cast-src-Add-flag-to-maybe_record.patch,
    d/p/screen-cast-src-Fix-signedness-of-timestamp-field.patch,
    d/p/screen-cast-src-Make-record-functions-return-an-error-whe.patch,
    d/p/screen-cast-src-Make-the-two-record-vfuncs-more-similarly.patch,
    d/p/screen-cast-src-Record-follow-up-frame-after-timeout.patch,
    d/p/screen-cast-src-Remove-follow-up-timeout-source-on-disabl.patch,
    d/p/screen-cast-src-Use-G_USEC_PER_SEC-instead-of-1000000.patch,
    d/p/screen-cast-window-stream-src-Fix-indentation.patch:
    - Import more fixes for screencasting and remote desktop

 -- Marco Trevisan (Treviño) <email address hidden> Wed, 23 Sep 2020 22:03:53 +0200

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for mutter has completed successfully and the package is now being 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.