FS#64389 - [mutter] gnome-shell hangs on Ctrl+Alt+Tab in X.Org session

Attached to Project: Arch Linux
Opened by Sibo Dong (flyingpig) - Monday, 04 November 2019, 19:06 GMT
Last edited by David Runge (dvzrv) - Tuesday, 19 November 2019, 21:50 GMT
Task Type Bug Report
Category Packages: Extra
Status Closed
Assigned To No-one
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 4
Private No

Details

Description:
Pressing Ctrl+Alt+Tab causes gnome-shell to hang in an X.Org session. The mouse can still move, and you can still access another TTY with Ctrl+Alt+FN, but everything else is unresponsive. I don't know if a Wayland session has the same issues.

Additional info:
* gnome-shell 1:3.34.1+7+g750c5acd3-1
* mutter 3.34.1+31+g51f7e8c4d-1

Steps to reproduce:
* Press Ctrl+Alt+Tab when logged in

Workaround:
* Downgrade mutter from 3.34.1+31+g51f7e8c4d to 3.34.1+26+gc0037305e-1
This task depends upon

Closed by  David Runge (dvzrv)
Tuesday, 19 November 2019, 21:50 GMT
Reason for closing:  Fixed
Comment by Sibo Dong (flyingpig) - Monday, 04 November 2019, 21:28 GMT
This may be related to https://gitlab.gnome.org/GNOME/mutter/commit/ef2f5f07f098d67d8fd1bba76d1df18d62daeb81 as other users have experienced hangs in other situations (as seen in the mentioned issues in the link).
Comment by Mike Dillamore (armadillo) - Tuesday, 05 November 2019, 13:30 GMT
Confirming downgrade of mutter resolves the issue.
Comment by Sibo Dong (flyingpig) - Wednesday, 06 November 2019, 18:36 GMT
It seems there is now a fix upstream, https://gitlab.gnome.org/GNOME/mutter/commit/1f56514e40855293b59eccf58ae6acf7bf37181e, on the gnome-3-34 branch.
Comment by Philipp Wolfer (phw) - Thursday, 07 November 2019, 10:56 GMT
I build a package with the commit (3.34.1+43+g1f56514e4) locally, and I can confirm this resolves the issue of mutter locking up.

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