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List: pykde
Subject: Re: Segmentation fault with webgl platform
From: Valentin Valls <valentin.valls () esrf ! fr>
Date: 2024-02-16 8:54:55
Message-ID: b0c9ea3c-671f-4e94-bede-7fc60db5cf79 () esrf ! fr
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Ah, i see. Thanks for the answer.
On 2/16/24 12:56 AM, Charles wrote:
> WebGL streaming only works for QtQuick widgets
> (https://www.qt.io/blog/2018/11/23/qt-quick-webgl-release-512
> <https://www.qt.io/blog/2018/11/23/qt-quick-webgl-release-512>).
>
> On Fri, Feb 16, 2024 at 2:26 AM Valentin Valls <valentin.valls@esrf.fr
> <mailto:valentin.valls@esrf.fr>> wrote:
>
> Hi,
>
> I try to take a look at PyQt with webgl platform plugin.
>
> I have tested multiple version of PyQt but i always get the same
> segmentation fault.
>
> My operating system is a Debian 10, and i have tried with python
> 3.9 and 3.10 (from conda).
>
> Any idea if that could be a problem with PyQt or with my machine
> or env?
>
>
> Here is my app.py
>
> importsys
> fromPyQt5 importQt
> app = Qt.QApplication(sys.argv)
> w = Qt.QMainWindow()
> w.show()
> app.exec()
>
> Here is the last PyQt version i have tested
>
> $ pip install pyqt5 Downloading
> PyQt5-5.15.10-cp37-abi3-manylinux_2_17_x86_64.whl.metadata (2.1
> kB) Downloading
> PyQt5_sip-12.13.0-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.whl.metadata
> (504 bytes) Downloading
> PyQt5_Qt5-5.15.2-py3-none-manylinux2014_x86_64.whl (59.9 MB)
>
> Here is the execution
>
> $ export QSG_INFO=1 $ export QT_QPA_EGLFS_DEBUG=1 $ export
> QT_LOGGING_RULES=qt.qpa.*=true $ python app.py -platform
> webgl:port=8081 Warning: Ignoring XDG_SESSION_TYPE=wayland on
> Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
> qt.qpa.webgl: WebGL QPA Plugin created
> qt.qpa.input.methods.serialize:
> QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"
> qt.qpa.input.methods: socketWatcher.addPath
> "/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"
> qt.qpa.webgl.httpserver: Listening in port 8081 qt.qpa.webgl:
> Creating platform window for: 0x55d890722db0 qt.qpa.webgl: WebGL
> QPA platform plugin: Raster surfaces are not supported Erreur de
> segmentation
>
> And here is the backtrace
>
> $ gdb --args python app.py -platform webgl:port=8081 GNU gdb
> (Debian 10.1-1.7) 10.1.90.20210103-git Copyright (C) 2021 Free
> Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or
> later <http://gnu.org/licenses/gpl.html
> <http://gnu.org/licenses/gpl.html>> This is free software: you are
> free to change and redistribute it. There is NO WARRANTY, to the
> extent permitted by law. Type "show copying" and "show warranty"
> for details. This GDB was configured as "x86_64-linux-gnu". Type
> "show configuration" for configuration details. For bug reporting
> instructions, please see: <https://www.gnu.org/software/gdb/bugs/
> <https://www.gnu.org/software/gdb/bugs/>>. Find the GDB manual and
> other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/
> <http://www.gnu.org/software/gdb/documentation/>>.
>
> For help, type "help". Type "apropos word" to search for commands
> related to "word"... Reading symbols from python... (gdb) r
> Starting program:
> /home/valentin/Software/miniconda3/envs/qt/bin/python bbbb.py
> -platform webgl:port=8081 [Thread debugging using libthread_db
> enabled] Using host libthread_db library
> "/lib/x86_64-linux-gnu/libthread_db.so.1". Warning: Ignoring
> XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to
> run on Wayland anyway. qt.qpa.webgl: WebGL QPA Plugin created [New
> Thread 0x7fffea466700 (LWP 10315)] qt.qpa.input.methods.serialize:
> QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"
> qt.qpa.input.methods: socketWatcher.addPath
> "/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"
> qt.qpa.webgl.httpserver: Listening in port 8081 [New Thread
> 0x7fffe9c65700 (LWP 10317)] qt.qpa.webgl: Creating platform window
> for: 0x555555cefd80 qt.qpa.webgl: WebGL QPA platform plugin:
> Raster surfaces are not supported
>
> Thread 1 "python" received signal SIGSEGV, Segmentation fault.
> 0x00007ffff2e98ac0 in
> QPlatformBackingStore::setBackingStore(QBackingStore*) () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5
> (gdb) bt #0 0x00007ffff2e98ac0 in
> QPlatformBackingStore::setBackingStore(QBackingStore*) () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5
> #1 0x00007ffff2d5df6a in QBackingStore::handle() const () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Gui.so.5
> #2 0x00007ffff1154cf8 in QWidgetPrivate::create() () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5
> #3 0x00007ffff1154e96 in QWidget::create(unsigned long long,
> bool, bool) () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5
> #4 0x00007ffff1160164 in QWidgetPrivate::setVisible(bool) ()
> from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/Qt5/lib/libQt5Widgets.so.5
> #5 0x00007ffff075e543 in sipQMainWindow::setVisible(bool) ()
> from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/QtWidgets.abi3.so
> <http://QtWidgets.abi3.so> #6 0x00007ffff06d9822 in
> meth_QWidget_show () from
> /home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/QtWidgets.abi3.so
> <http://QtWidgets.abi3.so> #7 0x0000555555698468 in
> cfunction_call (func=0x7fffefad1ad0, args=<optimized out>,
> kwargs=<optimized out>) at
> /usr/local/src/conda/python-3.10.13/Objects/methodobject.c:552 #8
> 0x000055555569197b in _PyObject_MakeTpCall
> (tstate=0x555555909030, callable=0x7fffefad1ad0, args=<optimized
> out>, nargs=0, keywords=0x0) at
> /usr/local/src/conda/python-3.10.13/Objects/call.c:215 #9
> 0x000055555568d8c6 in _PyObject_VectorcallTstate (kwnames=0x0,
> nargsf=<optimized out>, args=<optimized out>,
> callable=0x7fffefad1ad0, tstate=<optimized out>) at
> /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:112
> #10 _PyObject_VectorcallTstate (kwnames=0x0, nargsf=<optimized
> out>, args=0x7ffff7895bb0, callable=0x7fffefad1ad0,
> tstate=<optimized out>) at
> /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:99
> #11 PyObject_Vectorcall (kwnames=0x0, nargsf=<optimized out>,
> args=0x7ffff7895bb0, callable=0x7fffefad1ad0) at
> /usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:123
> #12 call_function (kwnames=0x0, oparg=<optimized out>,
> pp_stack=<synthetic pointer>, trace_info=0x7fffffffbf70,
> tstate=<optimized out>) at
> /usr/local/src/conda/python-3.10.13/Python/ceval.c:5893
>
> Hope it can help for something.
>
> Regards,
>
> Valentin
>
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<p>Ah, i see. Thanks for the answer.</p>
<div class="moz-cite-prefix">On 2/16/24 12:56 AM, Charles wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABthHP9gc6DALSkFAj895KOj55vvYWh4sJhEVEHTNO1tbqcf2A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">WebGL
streaming only works for QtQuick widgets (<a
href="https://www.qt.io/blog/2018/11/23/qt-quick-webgl-release-512"
moz-do-not-send="true">https://www.qt.io/blog/2018/11/23/qt-quick-webgl-release-512</a>).</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Feb 16, 2024 at
2:26 AM Valentin Valls <<a
href="mailto:valentin.valls@esrf.fr" \
moz-do-not-send="true">valentin.valls@esrf.fr</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div
style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<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>
<div style="color:rgb(212,212,212);background-color:rgb(30,30,30);font-family:"Droid \
Sans Mono","monospace",monospace;font-weight:normal;font-size:14px;line-height:19px;white-space:pre-wrap">
<div><span style="font-family:terminal,monaco,monospace"><span \
style="color:rgb(197,134,192)">import</span><span style="color:rgb(212,212,212)"> \
sys</span></span></div> <div><span \
style="font-family:terminal,monaco,monospace"><span \
style="color:rgb(197,134,192)">from</span><span style="color:rgb(212,212,212)"> PyQt5 \
</span><span style="color:rgb(197,134,192)">import</span><span \
style="color:rgb(212,212,212)"> Qt</span></span></div> <span \
style="color:rgb(212,212,212);font-family:terminal,monaco,monospace">app = \
Qt.QApplication(sys.argv)</span> <div><span \
style="color:rgb(212,212,212);font-family:terminal,monaco,monospace">w = \
Qt.QMainWindow()</span></div> <div><span \
style="color:rgb(212,212,212);font-family:terminal,monaco,monospace">w.show()</span></div>
<div><span style="color:rgb(212,212,212);font-family:terminal,monaco,monospace">app.exec()</span></div>
</div>
<p>Here is the last PyQt version i have tested</p>
<div style="color:rgb(212,212,212);background-color:rgb(30,30,30);font-family:"Droid \
Sans Mono","monospace",monospace;font-weight:normal;font-size:14px;line-height:19px;white-space:pre-wrap">
<p><span style="font-family:terminal,monaco,monospace">$ pip install pyqt5</span>
<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> <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> <span style="font-family:terminal,monaco,monospace"> Downloading \
PyQt5_Qt5-5.15.2-py3-none-manylinux2014_x86_64.whl (59.9 MB)</span></p> </div>
<p>Here is the execution</p>
<div style="color:rgb(212,212,212);background-color:rgb(30,30,30);font-family:"Droid \
Sans Mono","monospace",monospace;font-weight:normal;font-size:14px;line-height:19px;white-space:pre-wrap">
<p><span style="font-family:terminal,monaco,monospace">$ export QSG_INFO=1</span>
<span style="font-family:terminal,monaco,monospace">$ export \
QT_QPA_EGLFS_DEBUG=1</span> <span style="font-family:terminal,monaco,monospace">$ \
export QT_LOGGING_RULES=qt.qpa.*=true</span> <span \
style="font-family:terminal,monaco,monospace">$ python app.py -platform \
webgl:port=8081</span>
<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> <span style="font-family:terminal,monaco,monospace">qt.qpa.webgl: \
WebGL QPA Plugin created</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.input.methods.serialize: \
QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.input.methods: \
socketWatcher.addPath \
"/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"</span>
<span style="font-family:terminal,monaco,monospace">qt.qpa.webgl.httpserver: \
Listening in port 8081</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.webgl: Creating platform window \
for: 0x55d890722db0</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.webgl: WebGL QPA platform \
plugin: Raster surfaces are not supported</span> <span \
style="font-family:terminal,monaco,monospace">Erreur de segmentation</span></p> \
</div> <p>And here is the backtrace</p>
<div style="color:rgb(212,212,212);background-color:rgb(30,30,30);font-family:"Droid \
Sans Mono","monospace",monospace;font-weight:normal;font-size:14px;line-height:19px;white-space:pre-wrap">
<p><span style="font-family:terminal,monaco,monospace">$ gdb --args python app.py \
-platform webgl:port=8081</span>
<span style="font-family:terminal,monaco,monospace">GNU gdb (Debian 10.1-1.7) \
10.1.90.20210103-git</span> <span \
style="font-family:terminal,monaco,monospace">Copyright (C) 2021 Free Software \
Foundation, Inc.</span> <span style="font-family:terminal,monaco,monospace">License \
GPLv3+: GNU GPL version 3 or later <<a href="http://gnu.org/licenses/gpl.html" \
target="_blank" moz-do-not-send="true">http://gnu.org/licenses/gpl.html</a>></span>
<span style="font-family:terminal,monaco,monospace">This is free software: you are \
free to change and redistribute it.</span> <span \
style="font-family:terminal,monaco,monospace">There is NO WARRANTY, to the extent \
permitted by law.</span> <span style="font-family:terminal,monaco,monospace">Type \
"show copying" and "show warranty" for details.</span> <span \
style="font-family:terminal,monaco,monospace">This GDB was configured as \
"x86_64-linux-gnu".</span> <span style="font-family:terminal,monaco,monospace">Type \
"show configuration" for configuration details.</span> <span \
style="font-family:terminal,monaco,monospace">For bug reporting instructions, please \
see:</span> <span style="font-family:terminal,monaco,monospace"><<a \
href="https://www.gnu.org/software/gdb/bugs/" target="_blank" \
moz-do-not-send="true">https://www.gnu.org/software/gdb/bugs/</a>>.</span> <span \
style="font-family:terminal,monaco,monospace">Find the GDB manual and other \
documentation resources online at:</span> <span \
style="font-family:terminal,monaco,monospace"> <<a \
href="http://www.gnu.org/software/gdb/documentation/" target="_blank" \
moz-do-not-send="true">http://www.gnu.org/software/gdb/documentation/</a>>.</span></p>
<p><span style="font-family:terminal,monaco,monospace">For help, type "help".</span>
<span style="font-family:terminal,monaco,monospace">Type "apropos word" to search for \
commands related to "word"...</span> <span \
style="font-family:terminal,monaco,monospace">Reading symbols from python...</span> \
<span style="font-family:terminal,monaco,monospace">(gdb) r</span> <span \
style="font-family:terminal,monaco,monospace">Starting program: \
/home/valentin/Software/miniconda3/envs/qt/bin/python bbbb.py -platform \
webgl:port=8081</span> <span style="font-family:terminal,monaco,monospace">[Thread \
debugging using libthread_db enabled]</span> <span \
style="font-family:terminal,monaco,monospace">Using host libthread_db library \
"/lib/x86_64-linux-gnu/libthread_db.so.1".</span> <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> <span style="font-family:terminal,monaco,monospace">qt.qpa.webgl: \
WebGL QPA Plugin created</span> <span \
style="font-family:terminal,monaco,monospace">[New Thread 0x7fffea466700 (LWP \
10315)]</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.input.methods.serialize: \
QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"</span> <span \
style="font-family:terminal,monaco,monospace">qt.qpa.input.methods: \
socketWatcher.addPath \
"/home/valentin/.config/ibus/bus/ac70eafeeafc44c6af5896660704e451-unix-wayland-0"</span>
<span style="font-family:terminal,monaco,monospace">qt.qpa.webgl.httpserver: \
Listening in port 8081</span> <span \
style="font-family:terminal,monaco,monospace">[New Thread 0x7fffe9c65700 (LWP \
10317)]</span> <span style="font-family:terminal,monaco,monospace">qt.qpa.webgl: \
Creating platform window for: 0x555555cefd80</span> <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> <span \
style="font-family:terminal,monaco,monospace">0x00007ffff2e98ac0 in \
QPlatformBackingStore::setBackingStore(QBackingStore*) ()</span> <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>
<span style="font-family:terminal,monaco,monospace">(gdb) bt</span>
<span style="font-family:terminal,monaco,monospace">#0 0x00007ffff2e98ac0 in \
QPlatformBackingStore::setBackingStore(QBackingStore*) ()</span> <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>
<span style="font-family:terminal,monaco,monospace">#1 0x00007ffff2d5df6a in \
QBackingStore::handle() const ()</span> <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>
<span style="font-family:terminal,monaco,monospace">#2 0x00007ffff1154cf8 in \
QWidgetPrivate::create() ()</span> <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>
<span style="font-family:terminal,monaco,monospace">#3 0x00007ffff1154e96 in \
QWidget::create(unsigned long long, bool, bool) ()</span> <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>
<span style="font-family:terminal,monaco,monospace">#4 0x00007ffff1160164 in \
QWidgetPrivate::setVisible(bool) ()</span> <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>
<span style="font-family:terminal,monaco,monospace">#5 0x00007ffff075e543 in \
sipQMainWindow::setVisible(bool) ()</span> <span \
style="font-family:terminal,monaco,monospace"> from \
/home/valentin/Software/miniconda3/envs/qt/lib/python3.10/site-packages/PyQt5/<a \
href="http://QtWidgets.abi3.so" target="_blank" \
moz-do-not-send="true">QtWidgets.abi3.so</a></span> <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/<a \
href="http://QtWidgets.abi3.so" target="_blank" \
moz-do-not-send="true">QtWidgets.abi3.so</a></span> <span \
style="font-family:terminal,monaco,monospace">#7 0x0000555555698468 in \
cfunction_call (func=0x7fffefad1ad0, args=<optimized out>, kwargs=<optimized \
out>)</span> <span style="font-family:terminal,monaco,monospace"> at \
/usr/local/src/conda/python-3.10.13/Objects/methodobject.c:552</span> <span \
style="font-family:terminal,monaco,monospace">#8 0x000055555569197b in \
_PyObject_MakeTpCall (tstate=0x555555909030, callable=0x7fffefad1ad0, \
args=<optimized out>, nargs=0, keywords=0x0)</span> <span \
style="font-family:terminal,monaco,monospace"> at \
/usr/local/src/conda/python-3.10.13/Objects/call.c:215</span> <span \
style="font-family:terminal,monaco,monospace">#9 0x000055555568d8c6 in \
_PyObject_VectorcallTstate (kwnames=0x0, nargsf=<optimized out>, \
args=<optimized out>, callable=0x7fffefad1ad0, </span> <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> <span \
style="font-family:terminal,monaco,monospace">#10 _PyObject_VectorcallTstate \
(kwnames=0x0, nargsf=<optimized out>, args=0x7ffff7895bb0, \
callable=0x7fffefad1ad0, tstate=<optimized out>)</span> <span \
style="font-family:terminal,monaco,monospace"> at \
/usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:99</span> <span \
style="font-family:terminal,monaco,monospace">#11 PyObject_Vectorcall (kwnames=0x0, \
nargsf=<optimized out>, args=0x7ffff7895bb0, callable=0x7fffefad1ad0)</span> \
<span style="font-family:terminal,monaco,monospace"> at \
/usr/local/src/conda/python-3.10.13/Include/cpython/abstract.h:123</span> <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> <span \
style="font-family:terminal,monaco,monospace"> at \
/usr/local/src/conda/python-3.10.13/Python/ceval.c:5893</span></p>
</div>
<p>Hope it can help for something.</p>
<p>Regards,</p>
<p>Valentin</p>
</div>
</blockquote>
</div>
</blockquote>
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