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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 5.14.2.2
Affects Version/s: 5.11.0, 5.11.1, 5.11.2
Component/s: PySide, Shiboken
Labels:
- Reported_by_support_premium

Platform/s:

All
Commits:
52299827c64cccc1456f9050fdf3dd8596df3e6f (pyside/pyside-setup/5.14)

Description

PySide2/Qt5 crashes hard (Segmentation fault) when emitting a queued connection signal with an argument into a secondary QThread.

Note that this is a separate bug from ~~PYSIDE-810~~, garbage collection is explicitly disabled in the test case below.

PySide 1.x doesn't seem to be affected (unless the patches below have been back-ported).

Test case: crash1ex.py
Stack trace: stack1ex.txt

It looks like this bug might have been introduced here:

~~PYSIDE-164~~
~~PYSIDE-281~~
https://codereview.qt-project.org/#/c/84454/

It seems to be happening during the de-allocation of the Python object that is passed as an argument to the emit method (SbkDeallocWrapper):

#6  0x00007ffff56f16b2 in Shiboken::Object::deallocData (self=0xa6d368, cleanup=true)
    at shiboken/libshiboken/basewrapper.cpp:1346
#7  0x00007ffff56ee070 in SbkDeallocWrapperCommon (pyObj=<PySide.QtCore.QObject at remote 0xa6d368>, canDelete=true)
    at shiboken/libshiboken/basewrapper.cpp:246
#8  0x00007ffff56ee108 in SbkDeallocWrapper (pyObj=<PySide.QtCore.QObject at remote 0xa6d368>)
    at shiboken/libshiboken/basewrapper.cpp:255
#9  0x00007ffff7a84da3 in tupledealloc (op=0xa6b250) at Objects/tupleobject.c:222
#10 0x00007ffff59475f9 in PySide::SignalManager::callPythonMetaMethod (method=..., args=0xad7650, pyMethod=<instancemethod at remote 0x7ffff7f0b4b0>, isShortCuit=false)
    at pyside/libpyside/signalmanager.cpp:484
#11 0x00007ffff5947c10 in (anonymous namespace)::callMethod (object=0xaca7c0, id=4, args=0xad7650)
    at pyside/libpyside/signalmanager.cpp:587
#12 0x00007ffff594731c in PySide::SignalManager::qt_metacall (object=0xaca7c0, call=QMetaObject::InvokeMetaMethod, id=4, args=0xad7650)
    at pyside/libpyside/signalmanager.cpp:434
#13 0x00007ffff5cb763b in QObjectWrapper::qt_metacall (this=0xaca7c0, call=QMetaObject::InvokeMetaMethod, id=4, args=0xad7650)
    at PySide/QtCore/PySide/QtCore/qobject_wrapper.cpp:506