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Date: Thu, 25 Oct 2012 10:40:24 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: Emacs crashing on C-x C-g
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On 10/24/2012 5:26 PM, Ryan Johnson wrote:
> On 24/10/2012 5:01 PM, Ken Brown wrote:
>> On 10/24/2012 9:09 AM, Ryan Johnson wrote:
>>> On 01/10/2012 4:08 PM, Ryan Johnson wrote:
>>>  > On 01/10/2012 3:07 PM, Ken Brown wrote:
>>>  >> On 10/1/2012 2:51 PM, Ryan Johnson wrote:
>>>  >>> I'm hitting a strange behavior with emacs lately, where hitting
>>>  >>> C-x C-g [1] sometimes causes it to quit instantly: no request to
>>>  >>> save files, no seg fault, no error message, just gone (have to
>>>  >>> reset the terminal to clear out emacs' ncurses settings). It
>>>  >>> invariably happens after I've been away from the terminal for a
>>>  >>> while (days) and then come back use it again.
>>>  >>>
>>>  >>> has anyone else had this happen to them?
>>>  >> I haven't seen it, and I do leave emacs running for days or weeks.
>>>  >> But I almost always run emacs under X, not in a terminal. Also, I
>>>  >> generally use the latest Cygwin snapshot.  Have you tried that?
>>>  >> Maybe you're being bitten by the /etc problem that Corinna fixed in
>>>  >> late July (http://cygwin.com/ml/cygwin/2012-07/msg00666.html).
>>>  > OK, I'll give the snapshot a try when I get a chance.
>>>
>>> Rats. I thought it was working, but the problem just it again. This time
>>> the emacs session had just been created by a mercurial check-in (to edit
>>> the changelog message) and crashed when I hit C-g to cancel an ESC I no
>>> longer needed.
>
>>> This time the crash is reproducible, and the test case below paints an
>>> "interesting" story:
>
>>> EDITOR='emacs -q -nw' hg ci
>>> ESC C-g
>>> <<<crash>>>
>>> reset
>>> <<<"reset is control-G (^G).">>>
>>> EDITOR='emacs -q -nw' hg ci
>>> C-g
>>> <<<"interrupted!">>>
>>> reset -i ^c
>>> <<<no message>>>
>>> cat
>>> C-g
>>> <<<"Quit (core dumped)">>>
>
>> This looks like a known Emacs issue:
>>
>>   http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12697
>>
>> I imagine it will be fixed before the release of Emacs 24.3.
> Agree the initial part is emacs. But I suspect the confused bash
> business is not. ^G should either send SIGINT or not, this core dump
> thing is not cool.

Do you know whether this is Cygwin-specific?  Have you checked to see 
what happens on Linux?

Ken


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