QSettings leads to deadlock

#5 <signal handler called>
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#6 0x0000007fb33cb488 in nanosleep () from lib/libpthread.so.0
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#7 0x0000007fb36e77d4 in ?? () from /lib/libQt5Core.so.5
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#8 0x0000007fb34aa6cc in QThread::msleep(unsigned long) () from /libQt5Core.so.5
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#9 0x0000007fb35c5324 in QLockFile::tryLock(int) () from /usr/lib/libQt5Core.so.5
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#10 0x0000007fb36208f8 in ?? () from //usr/lib/libQt5Core.so.5
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#11 0x0000007fb3620f70 in ?? () from /work/usr/lib/libQt5Core.so.5
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#12 0x0000007fb3620430 in QSettings::event(QEvent*) () from /work//lib/libQt5Core.so.5
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#13 0x0000007fb368a2a4 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /work//lib/libQt5Core.so.5
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#14 0x0000007fb368d770 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /work/Qt5Core.so.5
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#15 0x0000007fb36e89c8 in ?? () from /work/...L./sysroots/E023/E023.303/usr/lib/libQt5Core.so.5
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#16 0x0000007fb271a034 in g_main_context_dispatch () from /work/...L./sysroots/E023/E023.303/usr/lib/libglib-2.0.so.0
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#17 0x0000007fb271a298 in ?? () from /work/...L./sysroots/E023/E023.303/usr/lib/libglib-2.0.so.0
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#18 0x0000007fb271a364 in g_main_context_iteration () from /work/...L./sysroots/E023/E023.303/usr/lib/libglib-2.0.so.0
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#19 0x0000007fb36e7ed0 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /work/...L./sysroots/E023/E023.303/usr/lib/libQt5Core.so.5
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#20 0x0000007fb368822c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /work/...L./sysroots/E023/E023.303/usr/lib/libQt5Core.so.5
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#21 0x0000007fb3691620 in QCoreApplication::exec() () from /work/...L./sysroots/E023/E023.303/usr/lib/libQt5Core.so.5
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#22 0x0000005565424358 in main ()
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