Thread 2 (Thread 0x7e8618bfb700 (LWP 540)):
#0  0x00007f003eb97659 in poll () from /lib64/libc.so.6
#1  0x00007f003992abe6 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f003992ad10 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f003fa63c13 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f003fa1212b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f003f8609c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f003f86511d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007f003d7b0594 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f003eba20df in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f00417aee00 (LWP 530)):
#0  0x00007f003eb9cae9 in syscall () from /lib64/libc.so.6
#1  0x00007f003f85d22d in QBasicMutex::lockInternal() () from /lib64/libQt5Core.so.5
#2  0x00007f0040ebce51 in QMutexLocker::QMutexLocker (this=0x7ffdb83e4678, m=0x7f004175ff40 <(anonymous namespace)::Q_QGS_sDebugAreaCollector::innerFunction()::holder>) at /usr/include/qt5/QtCore/qmutex.h:206
#3  0x00007f00410ab681 in DebugAreaCollector::add (this=0x7f004175ff40 <(anonymous namespace)::Q_QGS_sDebugAreaCollector::innerFunction()::holder>, area="caldavresource.default") at /src/sink/common/log.cpp:269
#4  0x00007f00410a6f4b in collectDebugArea (debugArea="caldavresource.default") at /src/sink/common/log.cpp:296
#5  0x00007f00410a5b44 in Sink::Log::debugStream (debugLevel=Sink::Log::Warning, line=0, file=0x0, function=0x0, debugArea=0x7f003fabdfa0 "default", debugComponent=0x0) at /src/sink/common/log.cpp:379
#6  0x0000000000406d8d in qtMessageHandler (type=QtWarningMsg, context=..., msg="Could not remove our own lock file \"/home/developer/.qttest/share/sink/debugAreas.ini.lock\" maybe permissions changed meanwhile?") at /src/sink/synchronizer/main.cpp:162
#7  0x00007f003f8509be in qt_message_print(QtMsgType, QMessageLogContext const&, QString const&) () from /lib64/libQt5Core.so.5
#8  0x00007f003f8529ec in qt_message_output(QtMsgType, QMessageLogContext const&, QString const&) () from /lib64/libQt5Core.so.5
#9  0x00007f003f93eb40 in QDebug::~QDebug() () from /lib64/libQt5Core.so.5
#10 0x00007f003f9b55ba in QLockFile::unlock() () from /lib64/libQt5Core.so.5
#11 0x00007f003f959ffd in QLockFile::~QLockFile() () from /lib64/libQt5Core.so.5
#12 0x00007f003f98f4e3 in QConfFileSettingsPrivate::syncConfFile(QConfFile*) () from /lib64/libQt5Core.so.5
#13 0x00007f003f98fcee in QConfFileSettingsPrivate::sync() () from /lib64/libQt5Core.so.5
#14 0x00007f003f985df9 in QSettings::~QSettings() () from /lib64/libQt5Core.so.5
#15 0x00007f00410a8cd1 in QtSharedPointer::ExternalRefCountWithContiguousData<QSettings>::deleter (self=0x17e2890) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:255
#16 0x00007f0040e7092b in QtSharedPointer::ExternalRefCountData::destroy (this=0x17e2890) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:157
#17 0x00007f00410a8e2d in QSharedPointer<QSettings>::deref (dd=0x17e2890) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:461
#18 0x00007f00410a8de9 in QSharedPointer<QSettings>::deref (this=0x7ffdb83e4ea8) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:456
#19 0x00007f00410a8b75 in QSharedPointer<QSettings>::~QSharedPointer (this=0x7ffdb83e4ea8) at /usr/include/qt5/QtCore/qsharedpointer_impl.h:313
#20 0x00007f00410a9f23 in DebugAreaCollector::~DebugAreaCollector (this=0x7f004175ff40 <(anonymous namespace)::Q_QGS_sDebugAreaCollector::innerFunction()::holder>) at /src/sink/common/log.cpp:264
#21 0x00007f00410a76b9 in (anonymous namespace)::Q_QGS_sDebugAreaCollector::innerFunction()::Holder::~Holder() (this=0x7f004175ff40 <(anonymous namespace)::Q_QGS_sDebugAreaCollector::innerFunction()::holder>) at /src/sink/common/log.cpp:283
#22 0x00007f003eae172c in __run_exit_handlers () from /lib64/libc.so.6
#23 0x00007f003eae185c in exit () from /lib64/libc.so.6
#24 0x00007f003eacb252 in __libc_start_main () from /lib64/libc.so.6
#25 0x00000000004064da in _start ()