GNU bug report logs - #21402
race condition with compile mode line number parser

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <bug-gnu-emacs <at> gnu.org>
Subject: race condition with compile mode line number parser
Date: Wed, 02 Sep 2015 08:54:18 +0800

There is a race condition, whereas for me of
(compile "seq 99|perl -nwle 'print \"XX:$.:$_\"'" nil)
(compile "seq 999|perl -nwle 'print \"XX:$.:$_\"'" nil)
(compile "seq 9999|perl -nwle 'print \"XX:$.:$_\"'" nil)
the first and third ones complete with no problems,
whereas the middle one always stops at

XX:392:392
XX:393
Compilation finished at Wed Sep  2 08:46:23

(compile "perl -wle 'for(1..999){print \"XX:$_:$_\"}'" nil)
however finishes fine, as does plain
(compile "seq 999" nil) and
(compile "seq 999|perl -nwle 'print \"XX:$.:$_\"'; sleep 1" nil)

When I try it as root all finish fine.

Further notes: I was able to reproduce this on another machine via
doing C-x ESC ESC and pasting
(compile "seq 999|perl -nwle 'print \"XX:$.:$_\"'" nil)
at the Redo: prompt.

If one just puts the cursor at the end of that line in this message
and hits C-x C-e that will not reproduce the problem. Nor if one does
ESC : and pastes it in there either.

Note also there is two messages piling themselves on top of each
other, Compilation finished, and Find this error in (default XX): ...

My .emacs is in http://jidanni.org/comp/configuration/

emacs-version "24.5.1", Debian emacs24 24.5+1-1.

Message #8 received at 21402 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: 21402 <at> debbugs.gnu.org
Subject: Re: bug#21402: race condition with compile mode line number parser
Date: Mon, 14 Oct 2019 21:32:42 +0200

積丹尼 Dan Jacobson <jidanni <at> jidanni.org> writes:

> There is a race condition, whereas for me of
> (compile "seq 99|perl -nwle 'print \"XX:$.:$_\"'" nil)
> (compile "seq 999|perl -nwle 'print \"XX:$.:$_\"'" nil)
> (compile "seq 9999|perl -nwle 'print \"XX:$.:$_\"'" nil)
> the first and third ones complete with no problems,
> whereas the middle one always stops at
>
> XX:392:392
> XX:393
> Compilation finished at Wed Sep  2 08:46:23

I'm unable to reproduce this bug in Emacs 27.  Are you still seeing this?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #17 received at 21402-done <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: 21402-done <at> debbugs.gnu.org
Subject: Re: bug#21402: race condition with compile mode line number parser
Date: Fri, 18 Oct 2019 16:11:27 +0800

Seems OK now.

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