isaksengeir
commented
2 years ago I have seen this a couple of times before elsewhere. This is a hard one to debug, especially when it is random.
Qpainter? did you try to Google it?
- "QGraphicsEffect is the base class of QGraphicsOpacityEffect and for any graphics effects library in Qt. If you look into QGraphicsEffect source it uses QPainter for drawing. Hence user using any of graphics effects class on any widget implies he is initiating one QPainter to render effects and its obvious that we cannot draw using more than one QPainter at a time on a device or surface."
There are two or more painter trying to paint widget at same time.
@benteb I interpret this as a race condition somewhere ... widget creation / text insertion ... that happens sometimes. Not often. I do not know how to fix this. Not that it matters I think, but I notice you still run through conda, so I guess we are not comparing stuff from within the same environment. Just a comment.
Got a segmentation fault that is not reproducible while importing a pdb file:
first time, when segmentation fault occurred:
(envREACT) (base) bba029@uit-mac-131 REACT % python3 REACT.py qt.qpa.fonts: Populating font family aliases took 160 ms. Replace uses of missing font family "Courier" with one that exists to avoid this cost. libpng warning: iCCP: known incorrect sRGB profile libpng warning: iCCP: known incorrect sRGB profile Pymol: Starting Pymol: Running True setting defaults QPainter::begin: A paint device can only be painted by one painter at a time. QPainter::setCompositionMode: Painter not active QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it? zsh: segmentation fault python3 REACT.py
Second time, when segmentation fault did not occur:
(envREACT) (base) bba029@uit-mac-131 REACT % python3 REACT.py qt.qpa.fonts: Populating font family aliases took 203 ms. Replace uses of missing font family "Courier" with one that exists to avoid this cost. libpng warning: iCCP: known incorrect sRGB profile libpng warning: iCCP: known incorrect sRGB profile Pymol: Starting Pymol: Running True setting defaults /Users/bba029/prorac/qmmm/L-PRO_RS.pdb setting defaults THREAD COMPLETE!
What is QPainter???