ID 388715 - Mari crashes when running a specific Python script for garbage cleanup.

Problem summary:
Mari crashes when running a specific Python script for garbage cleanup.

Customer reported version:
Mari 4.2v1

Customer reported platform:
n/a
 

Steps to reproduce:
1) In Mari, open the Python console [Ctrl+Alt+P].

2) Copy/paste the following code:

import gcimport sysimport threadingimport ctypesimport timefrom PySide2 import QtWidgetsfrom PySide2 import QtCoredef gcloop():    time.sleep(1.0) # YMMV    while 1:        gc.collect()        time.sleep(0.1)def circular():    label = QtWidgets.QWidget()    o1 = [label]    o2 = [o1]    o1.append(o2)    label.show()label = QtWidgets.QWidget()label.show()tm = QtCore.QTimer()tm.timeout.connect(circular)tm.start(100)sys.modules['killer'] = threading.Thread(target=gcloop)sys.modules['killer'].start()

3) Run the command by clicking Evaluate or by pressing the hotkey [Ctrl+Enter], and observe performance.

Expected behavior:
Mari should continue running without crashing.

Actual behavior:
Mari will crash after creating/closing approximately 2500 individual windows in ~5min.

Workaround:
A workaround is not available at this time.

Reproduced by Support in:
Mari 4.5v1 - Windows 10

Mari 4.2v1 - Windows 10

Mari 4.1v2 - Windows 10

Mari 4.0v4 - Windows 10

Mari 4.0v1 - Windows 10

Unable to reproduce bug in:
Mari 3.4v2 - Pyside2 was not available in versions prior to 4.0v1.

Earliest version tested:

Mari 3.4v2 - This feature did not exist before this version.