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crashed when use threading lib

------- this is my class ---------

import threading
class ThreadingExample(object):
""" Threading example class
The run() method will be started and it will run in the background
until the application exits.
"""

def init(self, interval=1):
        """ Constructor
        :type interval: int
        :param interval: Check interval, in seconds
        """ 
        self.interval = interval
        self.contador = 0

thread = threading.Thread(target=self.run, args=())
        thread.daemon = True                            # Daemonize thread
        thread.start()                                  # Start the execution

def run(self):
        """ Method that runs forever """ 
        while True:
        # Do something
            print('Doing something imporant in the background')
            #print(self.interval)
            time.sleep(self.interval)

def funcion(self, argumento):
        while True:
            self.contador += 1
            print('hola ---------')

--------- crash when call ThreadingExample() ------------
I also use operations with geometries
this is the link that i use as ref:
http://sebastiandahlgren.se/2014/06/27/running-a-method-as-a-background-thread-in-python/

i tried to use QRunnable but also crash

class:
from PyQt5.QtCore import *

class Worker(QRunnable):
'''
Worker thread
'''
def init(self, fn, *args, **kwargs):
super(Worker, self).__init__() # Store constructor arguments (re-used for processing)
self.fn = fn
self.args = args
self.kwargs = kwargs

def run(self):
        '''
        Initialise the runner function with passed args, kwargs.
        '''
        self.fn(*self.args, **self.kwargs)

error comes when call:
def execute_this_fn(self):
print("Hello!")

def oh_no(self): # <-------- was connected to a button
    # Pass the function to execute
        worker = Worker(self.execute_this_fn)

1. Execute
   self.threadpool.start(worker) # <------ error

Report Details¶

Crash ID: 6f8bc6b84541925a551ee2a4507a028eb94a48e4

Stack Trace

QRasterPaintEngine::brushChanged :
QsciScintillaBase::inputMethodQuery :
QsciStyledText::text :
QsciStyledText::text :
QsciStyledText::text :
QsciStyledText::text :
QsciScintillaBase::inputMethodQuery :
PyInit_Qsci :
QWidget::event :
QFrame::event :
PyInit_Qsci :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QWidgetPrivate::drawWidget :
QApplication::windowIcon :
QWidget::event :
QgisApp::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QCoreApplicationPrivate::sendPostedEvents :
qt_plugin_query_metadata :
QEventDispatcherWin32::processEvents :
TranslateMessageEx :
TranslateMessage :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QDialog::exec :
PyMethodDef_RawFastCallKeywords :
PyMethodDef_RawFastCallKeywords :
PyEval_EvalFrameDefault :
PyFunction_FastCallDict :
PyMethodDef_RawFastCallDict :
PyObject_Call :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
QMetaObject::activate :
QAction::activate :
QAbstractButton::click :
QAbstractButton::mouseReleaseEvent :
QToolButton::mouseReleaseEvent :
QWidget::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
TranslateMessageEx :
TranslateMessage :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.4.1-Madeira
QGIS code revision: 383851c597
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 2.3.2
Running against GDAL: 2.3.2

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 6.1.7601