bt

#0  0x00007ff4d419b9e7 in void std::__once_call_impl<std::_Bind_simple<std::_Mem_fn<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*)> (std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*)> >() ()
   from /lib64/libLLVM-3.9.so
#1  0x00007ff4e5a110e9 in __pthread_once_slow (once_control=0xeba3c8, init_routine=0x7ff4e573bda0 <__once_proxy>) at pthread_once.c:116
#2  0x00007ff4ca08cc5a in std::thread::_Impl<std::_Bind_simple<std::__future_base::_Async_state_impl<std::_Bind_simple<ClangBackEnd::ProcessCreator::createProcess() const::{lambda()#1} ()>, std::unique_ptr<QProcess, ClangBackEnd::QProcessUniquePointerDeleter> >::_Async_state_impl(ClangBackEnd::ProcessCreator::createProcess() const::{lambda()#1} (&&)())::{lambda()#1} ()> >::_M_run() ()
   from /home/michal/Programy/Qt/Tools/QtCreator/lib/qtcreator/plugins/../libClangsupport.so.4
#3  0x00007ff4e573ce50 in execute_native_thread_routine () from /lib64/libstdc++.so.6
#4  0x00007ff4e5a0a66d in start_thread (arg=0x7ff4bb7fe700) at pthread_create.c:334
#5  0x00007ff4e4eb0e4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109