Frequent crashes on use of Find Usages

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fff2a2ea700 (LWP 6487)]
0x00007ffff42c23d9 in raise () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007ffff42c23d9 in raise () from /usr/lib/libc.so.6
#1  0x00007ffff42c37d8 in abort () from /usr/lib/libc.so.6
#2  0x00007ffff42ffe64 in __libc_message () from /usr/lib/libc.so.6
#3  0x00007ffff430562e in malloc_printerr () from /usr/lib/libc.so.6
#4  0x00007ffff4306307 in _int_free () from /usr/lib/libc.so.6
#5  0x00007ffff5382758 in QArrayData::deallocate (data=0x7fff200e90c0, objectSize=8, alignment=8) at tools/qarraydata.cpp:125
#6  0x00007ffff6693c0b in QTypedArrayData<double>::deallocate (data=0x7fff200e90c0) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:230
#7  0x00007ffff6693227 in QVector<double>::freeData (this=0x7fff2a2e9960, x=0x7fff200e90c0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:453
#8  0x00007ffff6692e48 in QVector<double>::~QVector (this=0x7fff2a2e9960, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qvector.h:76
#9  0x00007ffff6693026 in QtConcurrent::Median<double>::median (this=0x7fff2a2e9a18) at ../../include/QtConcurrent/../../src/concurrent/qtconcurrentmedian.h:108
#10 0x00007ffff6692ac2 in QtConcurrent::BlockSizeManager::timeAfterUser (this=0x7fff2a2e99e0) at qtconcurrentiteratekernel.cpp:173
#11 0x00007fffd84caf59 in QtConcurrent::IterateKernel<QList<QString>::const_iterator, QList<CPlusPlus::Usage> >::forThreadFunction (this=0x7fff200727d0)
    at /home/mloskot/dev/qt/_git/qt5/qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentiteratekernel.h:231
#12 0x00007fffd84ca5a4 in QtConcurrent::IterateKernel<QList<QString>::const_iterator, QList<CPlusPlus::Usage> >::threadFunction (this=0x7fff200727d0)
    at /home/mloskot/dev/qt/_git/qt5/qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentiteratekernel.h:192
#13 0x00007ffff6691f9d in QtConcurrent::ThreadEngineBase::startBlocking (this=0x7fff20072878) at qtconcurrentthreadengine.cpp:151
#14 0x00007fffd84c8ea8 in QtConcurrent::ThreadEngine<QList<CPlusPlus::Usage> >::startBlocking (this=0x7fff200727d0)
    at /home/mloskot/dev/qt/_git/qt5/qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentthreadengine.h:156
#15 0x00007fffd84c7c36 in QtConcurrent::ThreadEngineStarter<QList<CPlusPlus::Usage> >::startBlocking (this=0x7fff2a2e9b90)
    at /home/mloskot/dev/qt/_git/qt5/qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentthreadengine.h:243
#16 0x00007fffd84c27de in QtConcurrent::blockingMappedReduced<QList<CPlusPlus::Usage>, QStringList, (anonymous namespace)::ProcessFile, (anonymous namespace)::UpdateUI> (
    sequence=..., map=..., reduce=..., options=...) at /home/mloskot/dev/qt/_git/qt5/qtbase/include/QtConcurrent/../../src/concurrent/qtconcurrentmap.h:217
#17 0x00007fffd84bf4bf in find_helper (future=..., workingCopy=..., context=..., findRefs=0xc42830, symbol=0x7fff242ac340)
    at /home/mloskot/dev/qt/_git/qt-creator/src/plugins/cpptools/cppfindreferences.cpp:311
#18 0x00007fffd84ca82e in QtConcurrent::StoredInterfaceFunctionCall4<CPlusPlus::Usage, void (*)(QFutureInterface<CPlusPlus::Usage>&, CppTools::CppModelManagerInterface::WorkingCopy, CPlusPlus::LookupContext, CppTools::Internal::CppFindReferences*, CPlusPlus::Symbol*), CppTools::CppModelManagerInterface::WorkingCopy, CPlusPlus::LookupContext, CppTools::Internal::CppFindReferences*, CPlusPlus::Symbol*>::run (this=0x36ad9d0) at /home/mloskot/dev/qt/_git/qt-creator/src/libs/utils/runextensions.h:266
#19 0x00007ffff537a957 in QThreadPoolThread::run (this=0x2095d40) at thread/qthreadpool.cpp:100
#20 0x00007ffff5380bb7 in QThreadPrivate::start (arg=0x2095d40) at thread/qthread_unix.cpp:345
#21 0x00007ffff4e5d0a2 in start_thread () from /usr/lib/libpthread.so.0
#22 0x00007ffff437249d in clone () from /usr/lib/libc.so.6
(gdb)