bug#16665: Hitting C-c C-c in *shell* causes segmentation fault

bug#16665: Hitting C-c C-c in *shell* causes segmentation fault

[Dan Jacobson]

Hitting C-c C-c in *shell* causes segmentation fault.
Reproducible every time.
The message always starts with
  sh: syntax error near unexpected token `1'
and ends with
  Process shell segmentation fault
# grep nobody /etc/passwd
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
# su - nobody
No directory, logging in with HOME=/
$ emacs -nw -f shell
sh-4.3$   C-c C-c

sh-4.3$ sh: syntax error near unexpected token `1'
sh-4.3$ sh: $'\b\210D\020\b\035\v\b\340\313': command not found
sh-4.3$ sh: $'\b\300\347': command not found ...
sh-4.3$ sh: syntax error near unexpected token `('
sh-4.3$ >
Process shell segmentation fault


# ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Mar  5  2012 /bin/sh -> bash
$ bash --version
GNU bash, version 4.3.0(1)-rc1 (i486-pc-linux-gnu)

bug#16665: Hitting C-c C-c in *shell* causes segmentation fault

[Glenn Morris]

The shell is segfaulting, therefore seems like a shell bug.

bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Chet Ramey]

On 2/6/14, 6:11 PM, Dan Jacobson wrote:
> Dear Bug-Bash gentlemen,
> http://debbugs.gnu.org/16665 says it seems like a bash bug.
> Please have a look if you are also an emacs person.

OK, I'll bite.  What is C-c C-c supposed to do?  It looks like it just
spews a bunch of garbage to your screen.  Is that the intent?

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/

bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Dan Jacobson]

Dear Bug-Bash gentlemen,
http://debbugs.gnu.org/16665 says it seems like a bash bug.
Please have a look if you are also an emacs person.

bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Dan Jacobson]

>>>>> "CR" == Chet Ramey <chet.ramey@case.edu> writes:

CR> OK, I'll bite.  What is C-c C-c supposed to do?  It looks like it just
CR> spews a bunch of garbage to your screen.  Is that the intent?

C-c C-c runs the command comint-interrupt-subjob, which is an
interactive compiled Lisp function in `comint.el'.

(comint-interrupt-subjob)

Interrupt the current subjob.
This command also kills the pending input
between the process mark and point.

bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Chris Down]

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On 2014-02-06 22:16:56 -0500, Chet Ramey wrote:
> OK, I'll bite.  What is C-c C-c supposed to do?  It looks like it just
> spews a bunch of garbage to your screen.  Is that the intent?

According to the Emacs manual[0]:

> Interrupt the shell or its current subjob if any
> (comint-interrupt-subjob). This command also kills any shell input
> pending in the shell buffer and not yet sent.

I should disclaim that I'm not an Emacs user, so it's quite possible
that I am looking at the wrong part of the manual.

[0]: http://www.gnu.org/software/emacs/manual/html_node/emacs/Shell-Mode.html

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bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Glenn Morris]

Chet Ramey wrote:

> What is C-c C-c supposed to do?

It pretty much just sends SIGINT.

bug#16665: Hitting C-c C-c in Emacs' *shell* causes segmentation fault

[Chet Ramey]

On 2/6/14 10:25 PM, Dan Jacobson wrote:
>>>>>> "CR" == Chet Ramey <chet.ramey@case.edu> writes:
> 
> CR> OK, I'll bite.  What is C-c C-c supposed to do?  It looks like it just
> CR> spews a bunch of garbage to your screen.  Is that the intent?
> 
> C-c C-c runs the command comint-interrupt-subjob, which is an
> interactive compiled Lisp function in `comint.el'.

Thanks, that was what I needed.  I fixed this for bash-4.3 release.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/