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<p><span style="font-size: 12pt;">We're seeing a deadlock after upgrading from PyQt5.8.2 to 5.9.1.</span><span style="font-size: 12pt;"> </span><span style="font-size: 12pt;">Since our application is complex, it's difficult to pinpoint to what's causing this</span><span style="font-size: 12pt;">.
The problem is intermittent, but it can be reproduced by </span>repeatedly<span style="font-size: 12pt;"> clicking on an action.</span><span style="font-size: 12pt;"> </span><span style="font-size: 12pt;">I managed to get this stacktrace with VisualStudio:</span><br>
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<div> <span style="white-space:pre"> </span>ntdll.dll!_NtWaitForSingleObject@12 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>KernelBase.dll!WaitForSingleObjectEx()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>python35.dll!take_gil(_ts * tstate=0x1f194160) Line 224<span style="white-space:pre">
</span>C</div>
<div> <span style="white-space:pre"> </span>python35.dll!PyEval_RestoreThread(_ts * tstate=0x1f194160) Line 452<span style="white-space:pre">
</span>C</div>
<div> <span style="white-space:pre"> </span>python35.dll!PyGILState_Ensure() Line 821<span style="white-space:pre">
</span>C</div>
<div> <span style="white-space:pre"> </span>sip.pyd!689b3355()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>[Frames below may be incorrect and/or missing, no symbols loaded for sip.pyd]<span style="white-space:pre">
</span></div>
<div> <span style="white-space:pre"> </span>QtCore.pyd!654b68a4()<span style="white-space:pre">
</span>Unknown</div>
<div>><span style="white-space:pre"> </span>Qt5Core.dll!QObject::~QObject() Line 986<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>QtCore.pyd!654b4744()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QObject::event(QEvent * e=0x1e632358) Line 1273<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>QtCore.pyd!654b73a7()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver=0x1e632358, QEvent * e) Line 3717<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Widgets.dll!QApplication::notify(QObject * receiver=0x1e632438, QEvent * e=0x19a6a948) Line 3680<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>QtWidgets.pyd!648bd38b()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1018<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QCoreApplicationPrivate::sendPostedEvents(QObject * receiver=0x00000000, int event_type, QThreadData * data=0x1e632438) Line 1678<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QEventDispatcherWin32::sendPostedEvents() Line 1062<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!qt_internal_proc(HWND__ * hwnd=0x00460908, unsigned int message=0x00000401, unsigned int wp=0x00000000, long lp=0x00000000) Line 236<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>user32.dll!__InternalCallWinProc@20 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>user32.dll!_UserCallWinProcCheckWow@36 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>user32.dll!_DispatchMessageWorker@8 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>user32.dll!_DispatchMessageW@4 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 634<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 211<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>Qt5Core.dll!QThread::exec() Line 515<span style="white-space:pre">
</span>C++</div>
<div> <span style="white-space:pre"> </span>QtCore.pyd!6543a023()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>kernel32.dll!@BaseThreadInitThunk@12 ()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>ntdll.dll!__RtlUserThreadStart()<span style="white-space:pre">
</span>Unknown</div>
<div> <span style="white-space:pre"> </span>ntdll.dll!__RtlUserThreadStart@8 ()<span style="white-space:pre">
</span>Unknown</div>
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<div>As far as I understand this stacktrace, something is trying to get GIL at a QObject destruction, so I'm guessing that something that was supposed to release the GIL didn't. </div>
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<div>We're going to keep trying to isolate the problem into a standalone test case, but <span style="font-size: 12pt;">any pointers would be much appreciated.</span></div>
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<p>Thanks</p>
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<p>Milorad</p>
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