Description of problem: Version-Release number of selected component (if applicable): How reproducible: Always 100% of cases Steps to Reproduce: press the winkey (super) or move the mouse cursor to the upper-left corner Actual results: All windows of running applications disappear for good. You cannot switch to them with Alt-Tab, for example I can observe a grey background, a system panel on top and an application panel on bottom. But clicking on them has no effect. Clicking on "show applications" has no effect either Expected results: miniature windows are to be shown. Windows are selectable. Alt-tab should continue working. Additional info: This bug lasts at least from Fedora 30. But it used to be sporadic, not it's always reproducible on my machine Video card ATI Radeon 9600, video driver: amdgpu.
My previous bug report in Fedora 30 https://bugzilla.redhat.com/show_bug.cgi?id=1707158
Created attachment 1779131 [details] an extract from journalctl when the bug occurs
Mystery solved! The faulty applications are GNOME Shell (mutter?) and mpv. GNOME windows disappear because mpv pushes a mangled title $ wmctrl -l 0x04200002 0 N/A ����������� ���� - mpv relevant lines in journalctl (see the attached log): gnome-shell[26159]: Invalid UTF-8 string passed to pango_layout_set_text() gnome-shell[26159]: JS ERROR: TypeError: app is null _init@resource:///org/gnome/shell/ui/windowAttentionHandler.js:63:9 _onWindowDemandsAttention@resource:///org/gnome/shell/ui/windowAttentionHandler.js:37:22 mpv takes a title from metadata of a video file. So in my case if I run mpv with the --metadata-codepage=cp1251 option, everything works great: the title is correctly displayed and windows don't disappear. From this it follows that 1) mpv should validate a string before making it a title 2) mutter should be protected against a mangled string (show an empty title for example)
I filed bug reports upstream https://github.com/mpv-player/mpv/issues/8812 https://gitlab.gnome.org/GNOME/mutter/-/issues/1794
This message is a reminder that Fedora Linux 34 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 34 on 2022-06-07. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '34'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 34 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed.
Fedora Linux 34 entered end-of-life (EOL) status on 2022-06-07. Fedora Linux 34 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. Thank you for reporting this bug and we are sorry it could not be fixed.