[PyQt] Qt 5.13: Segfault on exit with Windows + QtWebEngine

[Florian Bruhin]

On Wed, Jul 17, 2019 at 11:54:10AM +0100, Phil Thompson wrote:
> On 13/07/2019 16:43, Florian Bruhin wrote:
> > With a quite minimal QtWebEngine example like this:
> > 
> >     from PyQt5.QtWebEngineWidgets import QWebEngineProfile
> >     from PyQt5.QtWidgets import QApplication
> >     from PyQt5.QtCore import QTimer
> > 
> >     qapp = QApplication([])
> >     p = QWebEngineProfile()
> >     QTimer.singleShot(500, qapp.quit)
> >     qapp.exec_()
> > 
> > I get a segfault on exit with Python 3.7.4 and PyQt5/PyQtWebEngine
> > 5.13.0
> > on Windows 10.
> > 
> > When I downgrade to PyQt5 5.12.3 and PyQtWebEngine 5.12.1 things work
> > fine.
> > 
> > Unfortunately I haven't been able to get a reliable stacktrace. Here are
> > some
> > examples of the stacks I got:
> > https://paste.the-compiler.org/view/5774da86
> > I don't think they really make sense though.
> 
> I can't reproduce this - although I am using Python v3.7.0.

I can reproduce it with Python 3.7.0 as well (both 32 and 64-bit).

Note that I don't get a "Python.exe has stopped" window, but "echo $?" shows
False in Powershell.

Similarly, running it from Python:

  subprocess.run([sys.executable, 'segv.py'], check=True)

Gives me:

  subprocess.CalledProcessError: Command '['...\\python.exe', 'segv.py']' returned non-zero exit status 3221225477.

Where 3221225477 is 0xC0000005, i.e. an access violation.

Florian

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