Arch Linux

Description:

After the update to Qt5.15 today, all Qt apps crash with a segmentation fault in __tzfile_compute(), apparently by overflowing the call stack (detailed crash analysis below)

Package versions:

- Qt5 package suite: 5.15.0-1, does not crash with 5.14.2
- qt5ct: 0.41-3, 0.41-2, trunk (r563), apparently any version

Steps to reproduce:

- Install Qt 5.15
- Install qt5ct (any version)
- export QT_QPA_PLATFORM=qt5ct
- Start any Qt app (konsole, qt5ct, matplotlib with Qt5 backend, etc...)

Crash Analysis:

- looking at the backtrace, it can be clearly seen that the problem is an unbounded recursion loop:

(full 10MB file here, it was too large for the bug tracker: https://gist.github.com/Ferdi265/32c8d820a0856ae1aca183ce1e3c8fae)

#19 0x00007fe48c308805 in QStyleFactory::create(QString const&) () from /usr/lib/libQt5Widgets.so.5
#20 0x00007fe48c329cb6 in ?? () from /usr/lib/libQt5Widgets.so.5
#21 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#22 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
... snip ...
#49859 0x00007fe48b7c969a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#49860 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#49861 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49862 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49863 0x00007fe48b7c969a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#49864 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#49865 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49866 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49867 0x00007fe48b7c969a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#49868 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#49869 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49870 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49871 0x00007fe48b7c969a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#49872 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#49873 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#49874 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
... snip ...
#99712 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#99713 0x00007fe48c32a985 in QProxyStyle::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#99714 0x00007fe48c2976f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#99715 0x00007fe48b7c969a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#99716 0x00007fe48b7fe499 in QObjectPrivate::setParent_helper(QObject*) () from /usr/lib/libQt5Core.so.5
#99717 0x00007fe48c32a895 in QProxyStyle::polish(QApplication*) () from /usr/lib/libQt5Widgets.so.5
#99718 0x00007fe48c29bcdd in QApplication::style() () from /usr/lib/libQt5Widgets.so.5
#99719 0x00007fe48c29bece in QApplicationPrivate::initialize() () from /usr/lib/libQt5Widgets.so.5
#99720 0x00007fe48c29c6df in QApplicationPrivate::init() () from /usr/lib/libQt5Widgets.so.5
#99721 0x0000555a1c5a33c8 in main (argc=<optimized out>, argv=<optimized out>) at main.cpp:40
#99722 0x00007fe48b180002 in __libc_start_main () from /usr/lib/libc.so.6
#99723 0x0000555a1c5a395e in _start () at /usr/include/qt/QtCore/qdebug.h:129

I can also provide a core dump and binary + debug info package, but those are too large for the bug tracker.