[PyQt] PyQt 5.7.1: Segfault in PyInit_QtCore -> ... -> PyUnicode_FromFormatV -> strlen

[Florian Bruhin]

Hi,

some users of my application reported that they get an instant
segfault when importing Qt modules after updating to PyQt 5.7.1 and
sip 4.19:

	#0  strlen () at ../sysdeps/x86_64/strlen.S:106
	#1  0x00005555556fbb43 in PyUnicode_FromFormatV ()
	#2  0x00005555556ba6f3 in PyErr_FormatV ()
	#3  0x00005555556ba7b4 in PyErr_Format ()
	#4  0x00007ffff25dfbe6 in ?? ()
	   from .../python3.5/site-packages/sip.cpython-35m-x86_64-linux-gnu.so
	#5  0x00007ffff61f7ab5 in PyInit_QtCore ()
	   from .../python3.5/site-packages/PyQt5/QtCore.so
	#6  0x00005555557abc91 in _PyImport_LoadDynamicModuleWithSpec ()
	[...]

Full stacktrace:
https://github.com/The-Compiler/qutebrowser/issues/2206#issuecomment-270265299

Any idea what could be going on there?

Florian

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