[PyQt] PyQt & Twisted

[Hans-Peter Jansen]

Am Samstag 10 Oktober 2009 schrieb Christian Caron:
> I used to have this crash rather infrequently but it got more frequent
> when I moved to PyQt 4.6 / Snow Leopard.

Already known issue.

Try the snapshots from last night (in europe).

Pete

> Configuration
> ---------------------
> Mac OSX 10.6.1
> Qt 4.5.3
> sip-4.9.1-snapshot-20091007
> PyQt-mac-gpl-4.6.1-snapshot-20091007
>
> Crash
> -----------
>
> My investigation so far shows that PyQtProxy::unislot deletes memory
> that was already deleted (in attempting to self destruct).
>
> Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000028
> Crashed Thread:  0  Dispatch queue: com.apple.main-thread
>
> Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
> 0   QtCore.so                     	0x00000001030db619
> PyQtProxy::unislot(void**) + 133
> 1   QtCore.so                     	0x00000001030db6f5
> PyQtProxy::qt_metacall(QMetaObject::Call, int, void**) + 119
> 2   QtCore                        	0x00000001005c1183
> QMetaObject::activate(QObject*, int, int, void**) + 675
> 3   QtCore.so                     	0x000000010302ae97
> sipQTimer::timerEvent(QTimerEvent*) + 77
> 4   QtCore                        	0x00000001005bf19e QObject::event
> (QEvent*) + 446
> 5   QtCore.so                     	0x000000010302ae2d sipQTimer::event
> (QEvent*) + 77
> 6   QtGui                         	0x00000001019fd3ed
> QApplicationPrivate::notify_helper(QObject*, QEvent*) + 189
> 7   QtGui                         	0x0000000101a0405e
> QApplication::notify(QObject*, QEvent*) + 238
> 8   QtGui.so                      	0x000000010136e1d1
> sipQApplication::notify(QObject*, QEvent*) + 95
> 9   QtCore                        	0x00000001005aec3c
> QCoreApplication::notifyInternal(QObject*, QEvent*) + 124
>
> Repro
> -----------
> Using the qt4reactor found here:
> http://twistedmatrix.com/trac/browser/sandbox/therve/qt4reactor.py?rev=22
>736&format=txt You may need to run the program a few times for it to
> crash.
>
> import qt4reactor
> qt4reactor.install()
>
> # Control-C
> from twisted.internet import reactor
> import signal; signal.signal(signal.SIGINT, lambda *args:reactor.stop())
>
> # Get web page.
> from twisted.web import client
> url = 'http://www.google.com'
> client.getPage(url)
>
> reactor.run()