Error: Segmentation fault (core dumped)

Question

Hello guys, I love programming and I'm totally new to python. Moreover, I'm getting some unusual error Segmentation fault (core dumped)

when I tried to execute the code:

class Workspace(QMainWindow, Ui_MainWindow):

    """ This class is for managing the whole GUI `Workspace'.

        Currently a Workspace is similar to a MainWindow

    """

    def __init__(self):

        #p= subprocess.Popen(["java -Xmx256m -jar bin/HelloWorld.jar"],cwd=r'/home/karen/sphinx4-1.0beta5-src/sphinx4-1.0beta5/', shell=True, stdout=subprocess.PIPE, bufsize= 4024)

        try:

            from Queue import Queue, Empty

        except ImportError:

            while True:

    #from queue import Queue, Empty  # python 3.x

                print "error"

        ON_POSIX = 'posix' in sys.builtin_module_names

        def enqueue_output(out, queue):

            for line in iter(out.readline, b''):

                queue.put(line)

            out.close()

        p= Popen(["java -Xmx256m -jar bin/HelloWorld.jar"],cwd=r'/home/karen/sphinx4-1.0beta5-src/sphinx4-1.0beta5/',stdout=PIPE, shell=True, bufsize= 4024)

        q = Queue()

        t = threading.Thread(target=enqueue_output, args=(p.stdout, q))

        #t = Thread(target=enqueue_output, args=(p.stdout, q))

        t.daemon = True # thread dies with the program

        t.start()

# ... do other things here

        def myfunc(q):

            while True:

                try: line = q.get_nowait()

         # or q.get(timeout=.1)

                except Empty:

                    print('Vacio')

                else: # got line

    # ... do something with line

                    print line  

        thread = threading.Thread(target=myfunc, args=(q,))

        thread.start()

In this following code, when I try to execute "myfunc" function, it works fine in out of thread, But when I try to run the same function inside the thread it fails, I request anyone to clear my doubt !!

Answer 1

If you're getting an error like this Segmentation fault (core dumped), this actually means that the python interpreter has been crashed. This can happen only when :

1. There might be something wrong with your installation of python

2. You're using a third party extension module which is written in C language, and that extension module might be crashed.

3. You're using ctypes (built-in module), and it crashes when you call external code

4. There is a bug which you've discovered in python, that you should report.

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To know more about these topics, you can also look at the following video tutorial: