void MissionPlanner::setValue(int idx, double value){

   webPage->page()->mainFrame()->evaluateJavaScript(QString("setDataValue(%1,%2)").arg(QString::number(idx)).arg(QString::number(value)));
}

void dummyTest(){
  for(int i = 0; i < 1000; i++)
    setValue(0,rand() % 150);
}

void startSerialProcessing() {
     boost::thread_attributes attr;
     attr.set_stack_size(1024);

     std::cout << "dummy processor started. n";
     serialThread= new boost::thread(&MavLinkAL::dummyTest, this);
 }

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x00007f3f0d6f361f in WTF::StringImpl::~StringImpl() ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#1  0x00007f3f0d6583f8 in JSC::JSValue::toStringSlowCase(JSC::ExecState*) const
    () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f3f0d68a396 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f3f0d55a9f1 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#4  0x00007f3f0d56313f in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4