Summary:
BUG: 420077
Sample stack traces :
From bug:
#2 QImage::copy (this=this@entry=0x558117775e20, r=...) at image/qimage.cpp:1172
#3 0x00007f22d0a24cdf in QImage::detach (this=this@entry=0x558117775e20) at image/qimage.cpp:1091
#4 0x00007f22d0a25ae0 in QImage::fill (this=0x558117775e20, color=...) at image/qimage.cpp:1806
#5 0x00007f22d0a25f5f in QImage::fill (this=this@entry=0x558117775e20, color=color@entry=Qt::transparent) at image/qimage.cpp:1780
#6 0x00007f22bf3bdffd in KWin::DrmOutput::updateCursor (this=0x5581176fb780) at ./plugins/platforms/drm/drm_output.cpp:175
#7 0x00007f22bf3b0e55 in KWin::DrmBackend::updateCursor (this=0x558117669b60) at ./plugins/platforms/drm/drm_backend.cpp:701
Locally reproduced:
#0 0x00007f360611e159 in KWayland::Server::OutputDeviceInterface::transform() const (this=<optimized out>)
at /home/meven/kde/src/kwayland/src/server/outputdevice_interface.cpp:590
#1 0x00007f3607438059 in KWin::AbstractWaylandOutput::transform() const (this=this@entry=0x5645bed10f90) at /home/meven/kde/src/kwin/abstract_wayland_output.cpp:317
#2 0x00007f35ecd8acd3 in KWin::DrmOutput::matrixDisplay(QSize const&) const (this=0x5645bed10f90, s=...)
at /home/meven/kde/src/kwin/plugins/platforms/drm/drm_output.cpp:155
#3 0x00007f35ecd8efa9 in KWin::DrmOutput::updateCursor() (this=<optimized out>) at /home/meven/kde/src/kwin/plugins/platforms/drm/drm_output.cpp:179
#4 0x00007f35ecd81db5 in KWin::DrmBackend::updateCursor() (this=0x5645bec743a0) at /home/meven/kde/src/kwin/plugins/platforms/drm/drm_backend.cpp:701
#5 0x00007f36049e7fe7 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6 0x00007f36075ee43f in KWin::Cursors::currentCursorChanged(KWin::Cursor*) (this=<optimized out>, _t1=<optimized out>)
at /home/meven/kde/build/kwin/kwin_autogen/EWIEGA46WW/moc_cursor.cpp:385
Test Plan: Could not reproduce
Reviewers: #kwin, zzag, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: ngraham, apol, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D28889
KWin is an easy to use, but flexible, composited Window Manager for Xorg windowing systems (Wayland, X11) on Linux. Its primary usage is in conjunction with a Desktop Shell (e.g. KDE Plasma Desktop). KWin is designed to go out of the way; users should not notice that they use a window manager at all. Nevertheless KWin provides a steep learning curve for advanced features, which are available, if they do not conflict with the primary mission. KWin does not have a dedicated targeted user group, but follows the targeted user group of the Desktop Shell using KWin as it's window manager.
KWin is not...
a standalone window manager (c.f. openbox, i3) and does not provide any functionality belonging to a Desktop Shell.
a replacement for window managers designed for use with a specific Desktop Shell (e.g. GNOME Shell)
a minimalistic window manager
designed for use without compositing or for X11 network transparency, though both are possible.
If you are an application developer having questions regarding windowing systems (either X11 or Wayland) please do not hesitate to contact us. Preferable through our mailing list. Ideally subscribe to the mailing list, so that your mail doesn't get stuck in the moderation queue.
End user
Please contact the support channels of your Linux distribution for user support. The KWin development team does not provide end user support.
Please refer to hacking documentation for how to build and start KWin. Further information about KWin's test suite can be found in TESTING.md.
Guidelines for new features
A new Feature can only be added to KWin if:
it does not violate the primary missions as stated at the start of this document
it does not introduce instabilities
it is maintained, that is bugs are fixed in a timely manner (second next minor release) if it is not a corner case.
it works together with all existing features
it supports both single and multi screen (xrandr)
it adds a significant advantage
it is feature complete, that is supports at least all useful features from competitive implementations
it is not a special case for a small user group
it does not increase code complexity significantly
it does not affect KWin's license (GPLv2+)
All new added features are under probation, that is if any of the non-functional requirements as listed above do not hold true in the next two feature releases, the added feature will be removed again.
The same non functional requirements hold true for any kind of plugins (effects, scripts, etc.). It is suggested to use scripted plugins and distribute them separately.
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