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List:       pykde
Subject:    Re: [PyQt] PyQt 5.6: Segfault in QMetaType::construct when emitting None as string
From:       Phil Thompson <phil () riverbankcomputing ! com>
Date:       2016-04-29 9:16:09
Message-ID: AF2B74A9-D7F6-4E38-A6A2-ECE0FC41F037 () riverbankcomputing ! com
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On 26 Apr 2016, at 9:13 pm, Florian Bruhin <me@the-compiler.org> wrote:
> 
> Hi,
> 
> The attached example defines a pyqtSignal(str) and then emits it with
> None as argument.
> 
> While this was an accident in my code, this worked with PyQt 5.5 and
> causes a segfault in 5.6:
> 
> 	#0  QtPrivate::RefCount::ref (this=0x0) at \
> ../../include/QtCore/../../src/corelib/tools/qrefcount.h:49  #1  0x00007ffff5de51e9 \
> in QString::QString (other=..., this=0x99b020) at \
> ../../include/QtCore/../../src/corelib/tools/qstring.h:890  #2  \
> QtMetaTypePrivate::QMetaTypeFunctionHelper<QString, true>::Construct \
> (where=0x99b020, t=<optimized out>) at \
> ../../include/QtCore/../../src/corelib/kernel/qmetatype.h:760  #3  \
> 0x00007ffff5de08b0 in QMetaType::construct (copy=0x999a08, where=<optimized out>, \
> this=0x7fffffffd690) at \
> ../../include/QtCore/../../src/corelib/kernel/qmetatype.h:2153  #4  \
> QMetaType::create (type=<optimized out>, copy=0x999a08) at \
> kernel/qmetatype.cpp:1702  #5  0x00007ffff645dd73 in ?? () from \
> /usr/lib/python3.5/site-packages/PyQt5/QtCore.so  #6  0x00007ffff6459cae in ?? () \
> from /usr/lib/python3.5/site-packages/PyQt5/QtCore.so  #7  0x00007ffff64677df in ?? \
> () from /usr/lib/python3.5/site-packages/PyQt5/QtCore.so  #8  0x00007ffff6468267 in \
> ?? () from /usr/lib/python3.5/site-packages/PyQt5/QtCore.so  #9  0x00007ffff5df89f0 \
> in QMetaObject::activate (sender=0x962d30, signalOffset=<optimized out>, \
> local_signal_index=<optimized out>, argv=<optimized out>) at \
> kernel/qobject.cpp:3745  #10 0x00007ffff646c0fe in ?? () from \
> /usr/lib/python3.5/site-packages/PyQt5/QtCore.so  #11 0x00007ffff79ba5e9 in \
> PyCFunction_Call () from /usr/lib/libpython3.5m.so.1.0  [...]
> 
> (I unfortunately built PyQt 5.6 without debugging symbols - let me know if you
> need a stacktrace with them)

Fixed in tonight's snapshot.

Thanks,
Phil
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