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Date: Wed, 28 Apr 2021 23:36:30 +0900
To: cygwin AT cygwin DOT com
Subject: Re: 3.2.0-1: possible regression Cygwin DDL bug (W10) when using
 multiple pipes
Message-Id: <20210428233630.1fd7f4d01d0d452f2f1e7205@nifty.ne.jp>
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Wed, 28 Apr 2021 15:38:13 +0200
M2 via Cygwin <cygwin AT cygwin DOT com> wrote:
> Hi,
> I found a possible regression issue between cygwin 3.1.7-1 and 3.2.0-1.
> 
> The issue happens with "short" output in multiple piping, such as the following example:
> 
>     dir | grep c | sed "s/^/foo/" | sed "s/oo/OO/"
> 
> (the case I run is different, but the bug is exposed by something silly/simple as this)
> 
> 
> In 3.1.7, all is fine and you get what you expect.
> 
> In 3.2.0, 3 out of 4 executions hang: the last command on the pipeline (i.e. `sed "s/oo/OO/"`)
> hangs forever, while all preceding commands (i.e. both `grep c` and `sed "s/^/foo/"`) terminate correctly.
> 
> Attached, cygcheck outputs for both 3.1.7 and 3.2.0

I cannot reproduce your problem.

In 64 bit cygwin:

yano AT Express5800-S70 ~
$ uname -a
CYGWIN_NT-10.0 Express5800-S70 3.2.0(0.340/5/3) 2021-03-29 08:42 x86_64 Cygwin

yano AT Express5800-S70 ~
$ mkdir abc && cd abc && touch a b c

yano AT Express5800-S70 ~/abc
$ dir | grep c | sed "s/^/foo/" | sed "s/oo/OO/"
fOOa  b  c

yano AT Express5800-S70 ~/abc
$


In 32 bit cygwin:

yano AT Express5800-S70 ~
$ uname -a
CYGWIN_NT-10.0-WOW Express5800-S70 3.2.0(0.340/5/3) 2021-03-29 08:37 i686 Cygwin

yano AT Express5800-S70 ~
$ mkdir abc && cd abc && touch a b c

yano AT Express5800-S70 ~/abc
$ dir | grep c | sed "s/^/foo/" | sed "s/oo/OO/"
fOOa  b  c

yano AT Express5800-S70 ~/abc
$


-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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