Emacs crashing on C-x C-g

Ryan Johnson ryan.johnson@cs.utoronto.ca
Thu Oct 25 14:55:00 GMT 2012

On 25/10/2012 10:40 AM, Ken Brown wrote:
> 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?
Oops, you're right: I see the exact same behavior on linux. However, 
that's via ssh in a mintty window, so it could still be mintty. Can 
somebody running Linux directly verify, perhaps?


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