GNU bug report logs - #726
23.0.60; OSX: Complete OS crash

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Markus Triska <markus.triska <at> gmx.at>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.60; OSX: Complete OS crash
Date: Fri, 15 Aug 2008 18:58:48 +0200 (CEST)

Let open7.el consist of the form:

   (let ((n 0))
     (while t
       (setq n (1+ n))
       (message "iteration: %s" n)
       (delete-process (start-process "bc" nil "bc"))))

When I do:

   $ emacs -Q --script open7.el

The whole OS crashes within about 500 iterations, and a gray box is
displayed stating that I must restart the computer. A shell script
that continuously starts and kills bc runs for long without problem:

   while true
   do
       bc &
       killall -9 bc
   done


In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-08-15 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Markus Triska <markus.triska <at> gmx.at>
Cc: 726 <at> debbugs.gnu.org, emacs-pretest-bug <at> gnu.org
Subject: Re: bug#726: 23.0.60; OSX: Complete OS crash
Date: Fri, 15 Aug 2008 15:41:45 -0400

> The whole OS crashes within about 500 iterations, and a gray box is
> displayed stating that I must restart the computer. A shell script
> that continuously starts and kills bc runs for long without problem:

Does it die because of run-away processes or memory exhaustion?
If not, it's an OS bug.


        Stefan

Message #20 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Markus Triska <markus.triska <at> gmx.at>
To: gnu-emacs-bug <at> moderators.isc.org
Subject: Re: bug#726: 23.0.60; OSX: Complete OS crash
Date: Fri, 15 Aug 2008 23:36:24 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Does it die because of run-away processes or memory exhaustion?

Most certainly not, since I have seen crashes within only 150
iterations. Note that only one subprocess is run at any time. When I do
not delete the subprocesses, there can be more than 1000 of them. I will
try to trace it down further. So far, when I slow down the program to
observe it more closely, the problem disappears. Also, I found that
today's Emacs 22.2.90 works for a long time without producing a crash on
the same program and system, while I can produce a crash with 23.0.60
every time in a few seconds.

Message #31 received at 726-done <at> debbugs.gnu.org (full text, mbox):

From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: 5819-done <at> debbugs.gnu.org, 726-done <at> debbugs.gnu.org
Subject: Re: bug#5819: 23.1.93;
	OSX: start-process sometimes returns an unready process
Date: Sat, 10 Apr 2010 19:34:03 +0900

>>>>> On Fri, 09 Apr 2010 09:14:48 -0400, Stefan Monnier <monnier <at> IRO.UMontreal.CA> said:

>>>> The following simpler one seems to work for me on 10.4 (but not
>>>> on 10.3, again).  Could you test if it also works for you, with
>>>> respect to this problem and #726 (23.0.60; OSX: Complete OS
>>>> crash)?
>>> Your patch fixes both issues for me. Thank you very much!
>> Maintainers, which branch should I install this patch to?  Bug#726
>> is marked as important.

> I'd say emacs-23, Thank you,

Done.

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

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