[Kde-bindings] [Bug 219787] New: krosspython: crash when PyQt signal is connected to C++ method that calls a function in the script

[Daniel Calviño Sánchez]

https://bugs.kde.org/show_bug.cgi?id=219787

           Summary: krosspython: crash when PyQt signal is connected to
                    C++ method that calls a function in the script
           Product: bindings
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: kde-bindings at kde.org
        ReportedBy: danxuliu at gmail.com


Version:            (using Devel)
Compiler:          gcc 4.4.1 
OS:                Linux
Installed from:    Compiled sources

In PyQt, signals can be added to Python objects. Since PyQt 4.5, those signals
are also added to the class's QMetaObject
(http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/pyqt4ref.html#defining-new-signals-with-qtcore-pyqtsignal),
so they can be connected even from C++ code.

I have found a crash in a very specific scenario. A signal is defined in a
Python class that inherits from QObject, and an object from that class is
created. There is a C++ method, invokable from the script, that receives a
QObject and the name of a signal. That C++ method does a C++ connect,
connecting the signal in the Python object with a C++ slot. When executed, the
slot calls a function in the script using the Kross Action. I know, it's a
weird scenario, but I use it ;)

So, when the Python signal is emitted, the C++ slot is invoked, and it calls
another Python function. The result is a crash.

In the next comments I'm going to post a unit test showing the problem and a
workaround for it.

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