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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 6.3.0
Component/s: PySide
Labels:
None
Environment:
Python 3.10

Platform/s:

All
Commits:
5b8ca1b92d (pyside/pyside-setup/dev) 6a6238d525 (pyside/pyside-setup/6.3) 6a6238d525 (pyside/pyside-setup/wip/6.3_pypy) 6a6238d525 (pyside/tqtc-pyside-setup/6.3) 5b8ca1b92d (pyside/tqtc-pyside-setup/dev)

Description

Hi PySide dev team,

PyQtGraph dev here, we noticed a segfault on PySide6 6.3.0 and python 3.10 (this segfault does not occur on python 3.9 or python 3.8). When the garbage collector cleans up an object that has a connected signal, this triggers a segfault. Here is a minimum reproducible example, along with a commented-out fix.

import gc
from PySide6 import QtCore

class X(QtCore.QObject):
    signal = QtCore.Signal()

    def callback(self):
        pass

child, parent = X(), X()

parent._child = child
child._parent = parent
meta = child.signal.connect(parent.callback)
print('before gc')
del child, parent
# uncomment to fix segfault
# QtCore.QObject.disconnect(meta)
gc.collect()