Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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5.15.2
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None
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iMac, macOS 11.2.1, Parallels Desktop 16.5.0, Ubuntu 20.04 Wayland.
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Linux/Wayland
Description
I get a crash on Ubuntu Wayland running in Parallels on macOS if I launch a GUI Qt app with QT_QPA_PLATFORM=wayland.
First I get a message 'Cannot find EGLConfig, returning null config'. Then SIGSEGV with such backtrace:
#0 0x00007ffff78eb980 in ?? () from /lib/x86_64-linux-gnu/libEGL.so.1 #1 0x000000000c85bfde in q_glFormatFromConfig (display=0x12105c00, config=config@entry=0x0, referenceFormat=...) at qeglconvenience.cpp:373 #2 0x000000000c80e9f6 in QtWaylandClient::QWaylandEglWindow::QWaylandEglWindow (this=0x12cfe3b0, window=<optimized out>, display=<optimized out>) at ../../../../hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp:65 #3 0x000000000c80d076 in QtWaylandClient::QWaylandEglClientBufferIntegration::createEglWindow (this=0x12b6bbc0, window=0x12c4bf20) at ../../../../hardwareintegration/client/wayland-egl/qwaylandeglclientbufferintegration.cpp:150 #4 0x000000000c8cb1d3 in QtWaylandClient::QWaylandIntegration::createPlatformWindow (window=0x12c4bf20, this=0x11ea2490) at qwaylandintegration.cpp:164 #5 QtWaylandClient::QWaylandIntegration::createPlatformWindow (this=0x11ea2490, window=0x12c4bf20) at qwaylandintegration.cpp:160 #6 0x000000000ce0e256 in QWindowPrivate::create (this=0x12cf3330, recursive=recursive@entry=false, nativeHandle=nativeHandle@entry=0) at kernel/qwindow.cpp:533 #7 0x000000000ce0e48d in QWindow::create (this=this@entry=0x12c4bf20) at kernel/qwindow.cpp:650 #8 0x000000000cac6faa in QWidgetPrivate::create (this=this@entry=0x11e28f30) at kernel/qwidget.cpp:1314 #9 0x000000000cac758e in QWidget::create (this=0x11e7eee0, window=<optimized out>, initializeWindow=<optimized out>, destroyOldWindow=<optimized out>) at kernel/qwidget.cpp:1179 #10 0x000000000cad5124 in QWidgetPrivate::setVisible (this=0x11e28f30, visible=<optimized out>) at kernel/qwidget.cpp:8080
It looks like here:
there is no check for nullptr in m_eglConfig.
Maybe the config availability could be checked before creating the QWaylandEglWindow and if there is none fallback to QWaylandWindow instead.