[issue30345] test_gdb fails on Python 3.6 when built with LTO+PGO

[Mikhail]

Mikhail added the comment:

The actual stack, which I'm trying to debug, begins like this:

#0  0xbfbfd34e in ?? ()
#1  0x2a9ec81e in ?? () from /opt/lib/qt5/libQt5WebKit.so.5
#2  0x2acf0efe in ?? () from /opt/lib/qt5/libQt5WebKit.so.5
#3  0x2acd8b74 in ?? () from /opt/lib/qt5/libQt5WebKit.so.5
#4  0x2acd5d60 in ?? () from /opt/lib/qt5/libQt5WebKit.so.5
#5  0x2acd87ae in ?? () from /opt/lib/qt5/libQt5WebKit.so.5
#6  0x2a9fe2e3 in QWebFrameAdapter::load(QNetworkRequest const&, QNetworkAccessManager::Operation, QByteArray const&) () from /opt/lib/qt5/libQt5WebKit.so.5
#7  0x2d7a18dd in QWebFrame::setUrl(QUrl const&) () from /opt/lib/qt5/libQt5WebKitWidgets.so.5
#8  0x2d7ad5eb in QWebView::setUrl(QUrl const&) () from /opt/lib/qt5/libQt5WebKitWidgets.so.5
#9  0x2d75efd4 in meth_QWebView_setUrl(_object*, _object*) ()
   from /opt/lib/python3.6/site-packages/PyQt5/QtWebKitWidgets.so
#10 0x28125151 in _PyCFunction_FastCallDict () from /opt/lib/libpython3.6m.so.1.0
#11 0x28125326 in _PyCFunction_FastCallKeywords () from /opt/lib/libpython3.6m.so.1.0
#12 0x2819a458 in ?? () from /opt/lib/libpython3.6m.so.1.0
#13 0x28193ab2 in _PyEval_EvalFrameDefault () from /opt/lib/libpython3.6m.so.1.0
#14 0x2819b790 in ?? () from /opt/lib/libpython3.6m.so.1.0
#15 0x2819a425 in ?? () from /opt/lib/libpython3.6m.so.1.0
#16 0x28193ab2 in _PyEval_EvalFrameDefault () from /opt/lib/libpython3.6m.so.1.0
[...]

Maybe, it is "too deep" into the native (not Python) code for the feature to work?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30345>
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