Yes, based on the stack trace, I also assumed that it is due to a desynchronization in the threads.

Steps to reproduce: Double click to edit the SectionView. Scroll the QSpinBox up and down to change the Section plane location in the X direction in the range (5mm, 15mm) so that the section plane leaves the shape. Repeat the scrolling process (maybe several times). At some point the crash occurs. O...

The error is due to a regression in the master branch.
This pull request fixes the error in FreeCAD-0.20: 7507.
And this in current master 7236

There are two pull request to fix this waiting to be merged in FreeCAD-0-20 and master, respectively

openBrain wrote: ↑Wed Aug 31, 2022 5:54 am

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return Py::new_reference_to(list);

The reference counting is ok. Py::Object already increments the count by default and the returned type must be Py::Object, not PyObject*, so no need to use Py::new_reference_to

ControlPy::activeDialog (or a new function, say, getActiveDialog ) can be modified to list the contents of the task dialog from this: Py::Object ControlPy::activeDialog(const Py::Tuple& args) if (!PyArg_ParseTuple(args.ptr(), "")) throw Py::Exception(); Gui::TaskView::TaskDialog* dlg ...

There is a regression reported on the assembly forum (specifically for assembly3) that is resolved by this pull request: https://github.com/FreeCAD/FreeCAD/pull/7236 The fix is embedded with other changes, so it might not be accepted. In that case, I can split the request and solve the specific regr...

The tp_dict member of the PyTypeObject struct can be set to a dictionary with the keys as name attributes and the values to the required enumeration (or anything else). But this must be done before executing the PyType_Ready function, which is currently executed inside InterpreterSingleton::addType ...

The error was already reported here: https://forum.freecadweb.org/viewtopic.php?f=20&t=69777
Tomorrow I will send a PR that includes the correction of this regression.