Re: [Idle-dev] Python Core Dump

Fuzzyman Thu, 24 Nov 2005 04:57:53 -0800

Hello Kurt,

I've done some more tracking of this crash (as below).

It's quite likely to just be some obscure windows oddity (unless anyone else can reproduce this ?). If *possible* I'll try a clean install on another machine with XP SP2 and see what happens. (I have to cajole my IT admin here to let me).

I'm quite happy to do this tracking around - but it's up to you how much effort you want to put in in following up what is just one bug report.

Kurt B. Kaiser wrote:

Fuzzyman <[EMAIL PROTECTED]> writes:

I did wonder if the traceback is because the crash happens in the
subprocess - meaning that the communication channel breaks - causing the
traceback. That is pure conjecture though. :-)


The code in question is executing in the GUI.  But see below.

The exception may be coming from the subprocess because it's having
problems communicating with an unresponsive GUI.

Is this Exception reproducible? How long after the crash does it
appear?  Are there any other symptoms to the crash?

Happens every time.

The traceback occurs almost instantaneously on the crash (a memory
location could not be read error).


So there is other information available related to the crash?  Please
post it.  Is it reproducible?

The windows crash method is always along the lines of :

The instruction "0x10238786" referenced memory at "0x000000c4". The memory
could not be "read".

The location of the instruction always varies - but the "0x000000c4" is always the same.

Other information ( I've copied and pasted your previous questions) :

> Is there any indication that the subprocess died? (Check your process
> manager, does the number of Python processes change after the crash?)

No - two running up until the crash.
I hit ok on the crash dialog and then both disappear together.

> Is this Exception reproducible? How long after the crash does it
> appear? Are there any other symptoms to the crash?

Happens the same every time. The exception traceback appears immediately I hit Ok on the
crash dialog.

> I gather you never see 'WSAStartup failed' except in this case.

Never. I normally don't run IDLE from the console though (so wouldn't *see*
error messages anyway).

> Is "Got here too." always printed?

Yes

> Does the ImportError always appear?

I don't see it. The crash happens *before* the open module dialog goes.

> Does the crash occur before or after clicking "OK" on the exception
> dialog?

Exception traceback occurs immediately *after* hitting ok.

I gather you never see 'WSAStartup failed' except in this case.

Never seen it before.

Is "Got here too." always printed?

Yup

Does the ImportError always appear?

I never actually see the ``ImportError``, it's obviously being trapped
and the exception occurs somewhere else. So I need to track down where
the crash happens - presumably in ``EditorWindow.open_module``.



Ah, the crash occurs while producing the ImportError dialog (which is
raised by the very next line of code after your print statement)?

That's what fiddling with ``open_module`` confirms.

Code (line 407 in EditorWindow.open_module) :

        try:
            print 'Got here'
            (f, file, (suffix, mode, type)) = _find_module(name)
            print 'Got here too.'
        except (NameError, ImportError), msg:
            print 'Got here three.'
            tkMessageBox.showerror("Import error", str(msg), parent=self.text)
            print 'Got here four.'
            return
       print 'Got here five ?'

Output :

C:\Documents and Settings\Voidspace>python C:\Python24\Lib\idlelib\idle.pyw
Got here
Got here three.
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python24\lib\lib-tk\Tkinter.py", line 1345, in __call__
    return self.func(*args)
File "C:\Python24\lib\lib-tk\Tkinter.py", line 456, in callit
    func(*args)
File "C:\Python24\lib\idlelib\PyShell.py", line 493, in poll_subprocess
    response = clt.pollresponse(self.active_seq, wait=0.05)
File "C:\Python24\lib\idlelib\rpc.py", line 421, in pollresponse
    message = self.pollmessage(wait)
File "C:\Python24\lib\idlelib\rpc.py", line 373, in pollmessage
    packet = self.pollpacket(wait)
File "C:\Python24\lib\idlelib\rpc.py", line 344, in pollpacket
    r, w, x = select.select([self.sock.fileno()], [], [], wait)
error: (10093, 'Either the application has not called WSAStartup, or WSAStartup
failed')

*However* - If I call tkMessageBox.showerror myself - it works fine (so that's not broken on my box).

EditorWindow.test() seems to fail by the way ? :-)

Can you restart the subprocess by using Ctrl-F6 after the crash, or is
the GUI completely dead/frozen?

The GUI is frozen until you hit Ok on the crash dialog - then the GUI vanishes.

What happens when you run IDLE w/o the subprocess by using the -n switch?

Ah... crash but no traceback. :-)

Fuzzyman
http://www.voidspace.org.uk/python/index.shtml

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