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<p>Hi,</p>
<p>I try to take a look at PyQt with webgl platform plugin.</p>
<p>I have tested multiple version of PyQt but i always get the same segmentation fault.</p>
<p>My operating system is a Debian 10, and i have tried with python 3.9 and 3.10 (from conda).</p>
<p>Any idea if that could be a problem with PyQt or with my machine or env?</p>
<p><br /></p>
<p>Here is my app.py</p>
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<div><span style="font-family: terminal, monaco, monospace;"><span style="color: #c586c0;">import</span><span style="color: #d4d4d4;"> sys</span></span></div>
<div><span style="font-family: terminal, monaco, monospace;"><span style="color: #c586c0;">from</span><span style="color: #d4d4d4;"> PyQt5 </span><span style="color: #c586c0;">import</span><span style="color: #d4d4d4;"> Qt</span></span></div>
<span style="color: #d4d4d4; font-family: terminal, monaco, monospace;">app = Qt.QApplication(sys.argv)</span>
<div><span style="color: #d4d4d4; font-family: terminal, monaco, monospace;">w = Qt.QMainWindow()</span></div>
<div><span style="color: #d4d4d4; font-family: terminal, monaco, monospace;">w.show()</span></div>
<div><span style="color: #d4d4d4; font-family: terminal, monaco, monospace;">app.exec()</span></div>
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<p>Here is the last PyQt version i have tested</p>
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<p><span style="font-family: terminal, monaco, monospace;">$ pip install pyqt5</span><br /><br /><span style="font-family: terminal, monaco, monospace;"> Downloading PyQt5-5.15.10-cp37-abi3-manylinux_2_17_x86_64.whl.metadata (2.1 kB)</span><br /><span style="font-family: terminal, monaco, monospace;"> Downloading PyQt5_sip-12.13.0-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.whl.metadata (504 bytes)</span><br /><span style="font-family: terminal, monaco, monospace;"> Downloading PyQt5_Qt5-5.15.2-py3-none-manylinux2014_x86_64.whl (59.9 MB)</span></p>
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<p>Here is the execution</p>
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<p><span style="font-family: terminal, monaco, monospace;">$ export QSG_INFO=1</span><br /><span style="font-family: terminal, monaco, monospace;">$ export QT_QPA_EGLFS_DEBUG=1</span><br /><span style="font-family: terminal, monaco, monospace;">$ export QT_LOGGING_RULES=qt.qpa.*=true</span><br /><span style="font-family: terminal, monaco, monospace;">$ python app.py -platform webgl:port=8081</span><br /><br /><span style="font-family: terminal, monaco, monospace;">Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: WebGL QPA Plugin created</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.input.methods.serialize: QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.input.methods: socketWatcher.addPath "/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl.httpserver: Listening in port 8081</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: Creating platform window for: 0x55d890722db0</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: WebGL QPA platform plugin: Raster surfaces are not supported</span><br /><span style="font-family: terminal, monaco, monospace;">Erreur de segmentation</span></p>
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<p>And here is the backtrace</p>
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<p><span style="font-family: terminal, monaco, monospace;">$ gdb --args python app.py -platform webgl:port=8081</span><br /><br /><span style="font-family: terminal, monaco, monospace;">GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git</span><br /><span style="font-family: terminal, monaco, monospace;">Copyright (C) 2021 Free Software Foundation, Inc.</span><br /><span style="font-family: terminal, monaco, monospace;">License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html></span><br /><span style="font-family: terminal, monaco, monospace;">This is free software: you are free to change and redistribute it.</span><br /><span style="font-family: terminal, monaco, monospace;">There is NO WARRANTY, to the extent permitted by law.</span><br /><span style="font-family: terminal, monaco, monospace;">Type "show copying" and "show warranty" for details.</span><br /><span style="font-family: terminal, monaco, monospace;">This GDB was configured as "x86_64-linux-gnu".</span><br /><span style="font-family: terminal, monaco, monospace;">Type "show configuration" for configuration details.</span><br /><span style="font-family: terminal, monaco, monospace;">For bug reporting instructions, please see:</span><br /><span style="font-family: terminal, monaco, monospace;"><https://www.gnu.org/software/gdb/bugs/>.</span><br /><span style="font-family: terminal, monaco, monospace;">Find the GDB manual and other documentation resources online at:</span><br /><span style="font-family: terminal, monaco, monospace;"> <http://www.gnu.org/software/gdb/documentation/>.</span></p>
<p><span style="font-family: terminal, monaco, monospace;">For help, type "help".</span><br /><span style="font-family: terminal, monaco, monospace;">Type "apropos word" to search for commands related to "word"...</span><br /><span style="font-family: terminal, monaco, monospace;">Reading symbols from python...</span><br /><span style="font-family: terminal, monaco, monospace;">(gdb) r</span><br /><span style="font-family: terminal, monaco, monospace;">Starting program: /home/valentin/Software/miniconda3/envs/qt/bin/python bbbb.py -platform webgl:port=8081</span><br /><span style="font-family: terminal, monaco, monospace;">[Thread debugging using libthread_db enabled]</span><br /><span style="font-family: terminal, monaco, monospace;">Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".</span><br /><span style="font-family: terminal, monaco, monospace;">Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: WebGL QPA Plugin created</span><br /><span style="font-family: terminal, monaco, monospace;">[New Thread 0x7fffea466700 (LWP 10315)]</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.input.methods.serialize: QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.input.methods: socketWatcher.addPath "/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl.httpserver: Listening in port 8081</span><br /><span style="font-family: terminal, monaco, monospace;">[New Thread 0x7fffe9c65700 (LWP 10317)]</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: Creating platform window for: 0x555555cefd80</span><br /><span style="font-family: terminal, monaco, monospace;">qt.qpa.webgl: WebGL QPA platform plugin: Raster surfaces are not supported</span></p>
<p><span style="font-family: terminal, monaco, monospace;">Thread 1 "python" received signal SIGSEGV, Segmentation fault.</span><br /><span style="font-family: terminal, monaco, monospace;">0x00007ffff2e98ac0 in QPlatformBackingStore::setBackingStore(QBackingStore*) ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">(gdb) bt</span><br /><span style="font-family: terminal, monaco, monospace;">#0 0x00007ffff2e98ac0 in QPlatformBackingStore::setBackingStore(QBackingStore*) ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">#1 0x00007ffff2d5df6a in QBackingStore::handle() const ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">#2 0x00007ffff1154cf8 in QWidgetPrivate::create() ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">#3 0x00007ffff1154e96 in QWidget::create(unsigned long long, bool, bool) ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">#4 0x00007ffff1160164 in QWidgetPrivate::setVisible(bool) ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5</span><br /><span style="font-family: terminal, monaco, monospace;">#5 0x00007ffff075e543 in sipQMainWindow::setVisible(bool) ()</span><br /><span style="font-family: terminal, monaco, monospace;"> from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/QtWidgets.abi3.so</span><br /><span style="font-family: terminal, monaco, monospace;">#6 0x00007ffff06d9822 in meth_QWidget_show () from /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/QtWidgets.abi3.so</span><br /><span style="font-family: terminal, monaco, monospace;">#7 0x0000555555698468 in cfunction_call (func=0x7fffefad1ad0, args=<optimized out>, kwargs=<optimized out>)</span><br /><span style="font-family: terminal, monaco, monospace;"> at /usr/local/src/conda/python-3.10.13/Objects/methodobject.c:552</span><br /><span style="font-family: terminal, monaco, monospace;">#8 0x000055555569197b in _PyObject_MakeTpCall (tstate=0x555555909030, callable=0x7fffefad1ad0, args=<optimized out>, nargs=0, keywords=0x0)</span><br /><span style="font-family: terminal, monaco, monospace;"> at /usr/local/src/conda/python-3.10.13/Objects/call.c:215</span><br /><span style="font-family: terminal, monaco, monospace;">#9 0x000055555568d8c6 in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=<optimized out>, args=<optimized out>, callable=0x7fffefad1ad0, </span><br /><span style="font-family: terminal, monaco, monospace;"> tstate=<optimized out>) at /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:112</span><br /><span style="font-family: terminal, monaco, monospace;">#10 _PyObject_VectorcallTstate (kwnames=0x0, nargsf=<optimized out>, args=0x7ffff7895bb0, callable=0x7fffefad1ad0, tstate=<optimized out>)</span><br /><span style="font-family: terminal, monaco, monospace;"> at /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:99</span><br /><span style="font-family: terminal, monaco, monospace;">#11 PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>, args=0x7ffff7895bb0, callable=0x7fffefad1ad0)</span><br /><span style="font-family: terminal, monaco, monospace;"> at /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:123</span><br /><span style="font-family: terminal, monaco, monospace;">#12 call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>, trace_info=0x7fffffffbf70, tstate=<optimized out>)</span><br /><span style="font-family: terminal, monaco, monospace;"> at /usr/local/src/conda/python-3.10.13/Python/ceval.c:5893</span></p>
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<p>Hope it can help for something.</p>
<p>Regards,</p>
<p>Valentin</p>
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