https://bugs.kde.org/show_bug.cgi?id=439873
--- Comment #19 from Ash Blake <telepath...@tutanota.com> --- (In reply to Ash Blake from comment #18) > and these multiple deletions may be normal Unfortunately, there is something wrong anyways even though it is not multiple deletion. Right before the crash, a pipeline that was involved in it got created and then deleted exactly three times in a row, so this is the same situation as previously but it turns out the destruction behaviour is actually normal. updateOutputs should not have received a deleted pipeline from findWorkingCombination though, so something is wrong here. Construction: $28 = (KWin::DrmPipeline * const) 0x56548a2aebd0 #0 KWin::DrmPipeline::DrmPipeline(KWin::DrmGpu*, KWin::DrmConnector*, KWin::DrmCrtc*, KWin::DrmPlane*) (this=this@entry=0x56548a2aebd0, gpu=0x565489679430, conn=0x565489e91be0, crtc=crtc@entry=0x5654896e4eb0, primaryPlane=primaryPlane@entry=0x5654896be1b0) at /home/ash/kde/src/kwin/src/plugins/platforms/drm/drm_pipeline.cpp:37 #1 0x00007f0549d5e49c in operator()(KWin::DrmCrtc*, KWin::DrmPlane*) const (__closure=__closure@entry=0x7ffe8d5e8660, crtc=0x5654896e4eb0, primaryPlane=0x5654896be1b0) at /home/ash/kde/src/kwin/src/plugins/platforms/drm/drm_gpu.cpp:364 Destruction: $29 = (KWin::DrmPipeline * const) 0x56548a2aebd0 #0 KWin::DrmPipeline::~DrmPipeline() (this=0x56548a2aebd0, __in_chrg=<optimized out>) at /usr/include/c++/11.1.0/bits/atomic_base.h:479 #1 0x00007f0549d5e99e in operator()(KWin::DrmCrtc*, KWin::DrmPlane*) const (__closure=__closure@entry=0x7ffe8d5e8660, crtc=<optimized out>, primaryPlane=0x7ffe8d5e85a8) at /home/ash/kde/src/kwin/src/plugins/platforms/drm/drm_gpu.cpp:373 Relevant lines from the segfault backtrace, with yet another exact point of crash: #0 QSharedPointer<KWin::DrmBuffer>::deref(QtSharedPointer::ExternalRefCountData*) (dd=0x565400000002) at /usr/include/qt/QtCore/qsharedpointer_impl.h:454 #1 QSharedPointer<KWin::DrmBuffer>::deref() (this=<synthetic pointer>) at /usr/include/qt/QtCore/qsharedpointer_impl.h:453 #2 QSharedPointer<KWin::DrmBuffer>::~QSharedPointer() (this=<synthetic pointer>, __in_chrg=<optimized out>) at /usr/include/qt/QtCore/qsharedpointer_impl.h:310 #3 QSharedPointer<KWin::DrmBuffer>::operator=(QSharedPointer<KWin::DrmBuffer> const&) (other=<optimized out>, other=..., this=0x56548a2aebf8) at /usr/include/qt/QtCore/qsharedpointer_impl.h:333 #4 KWin::DrmPipeline::present(QSharedPointer<KWin::DrmBuffer> const&) (this=0x56548a2aebd0, buffer=...) at /home/ash/kde/src/kwin/src/plugins/platforms/drm/drm_pipeline.cpp:81 #5 0x00007f0549d55bb8 in KWin::DrmOutput::present(QSharedPointer<KWin::DrmBuffer> const&, QRegion) (this=this@entry=0x565489e97d50, buffer=..., damagedRegion=...) at /home/ash/kde/src/kwin/src/plugins/platforms/drm/drm_output.cpp:394 -- You are receiving this mail because: You are watching all bug changes.
