[PySide] Segfault using QScxmlStateMachine.submitEvent(QScxmlEvent)

[Marian Beermann]

You might be able to get a stacktrace using the "faulthandler" module
(standard in Python 3, needs to be installed from PyPI for Python 2).

Am 09.11.18 um 07:53 schrieb Alex Blasche:
> Hi Romain,
> 
> please file a bugreport under bugreports.qt.io in the Pyside project. The content for the bug report you already have in your mail. If you happen to have a stack trace, that would be beneficial too.
> 
> Alex
> 
> ________________________________________
> From: PySide <pyside-bounces+alexander.blasche=qt.io at qt-project.org> on behalf of Romain LE DISEZ <romain at ledisez.net>
> Sent: Thursday, 8 November 2018 9:30:53 PM
> To: pyside at qt-project.org
> Subject: [PySide] Segfault using QScxmlStateMachine.submitEvent(QScxmlEvent)
> 
> Hi all,
> 
> I'm very new to Qt as I'm developing my first application with it. I'm trying to use StateChart based on QScxmlStateMachine.
> 
> It works fine except in a situation where I get a segfault. If, in the demo code below, you comment the line submitEvent('MY_EVENT') and uncomment the usage of a ScxmlEvent, the event is dispatched then the application segfaults. Output is:
>     StateMachine::active: True
>     ('MY_EVENT:', (), {})
>     Segmentation fault: 11
> 
> Am I doing something wrong or is it a bug? How can I provide you useful informations in the latter case. I'm running PySide2 (v5.11.2) on macOS (High Sierra) with Python v2.7.15 (coming from brew).
> 
> Thx for your help.
> 
> 
> demo.scxml:
>     <?xml version="1.0" encoding="UTF-8"?>
>     <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" binding="early" name="demo.scxml">
>         <transition type="internal" event="MY_EVENT"/>
>         <state id="StateMachine"/>
>     </scxml>
> 
> demo.py:
>     #!/usr/bin/env python
> 
>     import sys
> 
>     from PySide2.QtCore import QObject, QCoreApplication, SLOT, Slot
>     from PySide2.QtScxml import QScxmlStateMachine, QScxmlEvent
> 
> 
>     class Backend(QObject):
>         def __init__(self, machine):
>             super(Backend, self).__init__()
>             self.machine = machine
>             self.machine.connectToState('StateMachine', self, SLOT('state_machine_active(bool)'))
>             self.machine.connectToEvent('MY_EVENT', self, SLOT('my_event()'))
> 
>         @Slot(bool)
>         def state_machine_active(self, active):
>             print('StateMachine::active: %s' % active)
>             self.machine.submitEvent('MY_EVENT')
>             #ev = QScxmlEvent()
>             #ev.setName('MY_EVENT')
>             #ev.setEventType(QScxmlEvent.ExternalEvent)
>             #self.machine.submitEvent(ev)
> 
>         @Slot()
>         def my_event(self, *args, **kwargs):
>             print('MY_EVENT:', args, kwargs)
> 
> 
>     if __name__ == '__main__':
>         app = QCoreApplication(sys.argv)
> 
>         machine = QScxmlStateMachine.fromFile('demo.scxml')
>         b = Backend(machine)
>         machine.start()
> 
>         sys.exit(app.exec_())
> 
> --
> Romain
> 
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