setParallelRenderingEnabled with multiple canvas using api

[bowb]

What is the bug or the crash?

SEGFAULT in custom app with the following stack trace:

#2 0x00007f75a3f3a853 in qMapLessThanKey (key2=..., key1=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:69
#3 QMap<QString, QString>::insert (this=0x7f75a57660d8 <QgsGeos::isValid(QString*, bool, QgsGeometry*) const::translatedErrors>, akey=..., avalue=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:713
#4 0x00007f75a4991385 in QgsGeos::isValid (this=this@entry=0x7f74f4a7b210, errorMsg=errorMsg@entry=0x7f74f4a7b2c0, allowSelfTouchingHoles=allowSelfTouchingHoles@entry=false, errorLoc=errorLoc@entry=0x0)
at ../../src/core/geometry/qgsgeos.cpp:1978
#5 0x00007f75a49d0d08 in QgsSurface::isValid (this=0x55badcee3c40, error=..., flags=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qflags.h:145
#6 0x00007f75a490cb52 in QgsPalLabeling::prepareGeometry (geometry=..., context=..., ct=..., clipGeometry=..., mergeLines=) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qflags.h:121
#7 0x00007f75a491098c in QgsPalLayerSettings::registerFeatureWithDetails (this=this@entry=0x55bad9020260, f=..., context=..., obstacleGeometry=..., symbol=symbol@entry=0x55badcd56aa0)
at ../../src/core/labeling/qgslabellinesettings.h:114

Steps to reproduce the issue

I am using QGIS in a custom application with 2 canvas and using setParallelRenderingEnabled in each of them. I am getting a random SEGFAULT when loading up and initializing the application.

it appears that the insert into static QgsStringMap translatedErrors; is having issues in qgsgeos.cpp.

Is multiple canvas usage in a single application supported using ParallelRendering?

Versions

3.26.3

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response