Arch Linux

Description:
With libxcb 1.9.3 (updated a few days ago) every gui Qt5 applications crashes in the xcb-integration init code.
Partial backtrace attached.

Downgrade to libxcb 1.9.1 solves the problem.
Not sure what kind of bug this is (since other programs which uses libx11-xcb doesn't have the problem).
Will compile a qt5 with debug symbol and report back.

#0 0x00007fffef7b88f0 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#1 0x00007fffef7b8da8 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#2 0x00007fffef7b63cc in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#3 0x00007fffef7b7bc5 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#4 0x00007fffef7c76dc in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#5 0x00007ffff6b095dc in QPlatformIntegrationFactory::create(QString const&, QStringList const&, QString const&) () from /usr/lib/libQt5Gui.so.5
#6 0x00007ffff6b1158a in QGuiApplicationPrivate::createPlatformIntegration() ()
from /usr/lib/libQt5Gui.so.5
#7 0x00007ffff6b11f55 in QGuiApplicationPrivate::createEventDispatcher() ()
from /usr/lib/libQt5Gui.so.5
#8 0x00007ffff6634e31 in QCoreApplication::init() () from /usr/lib/libQt5Core.so.5
#9 0x00007ffff6634ea6 in QCoreApplication::QCoreApplication(QCoreApplicationPrivate&) () from /usr/lib/libQt5Core.so.5
#10 0x00007ffff6b12af9 in QGuiApplication::QGuiApplication(QGuiApplicationPrivate&)
() from /usr/lib/libQt5Gui.so.5
#11 0x00007ffff74d00cd in QApplication::QApplication(int&, char**, int) ()
from /usr/lib/libQt5Widgets.so.5


Additional info:
* package version(s)
* config and/or log files etc.


Steps to reproduce: