X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 8A680388700C
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1596814498;
	bh=lb47awIh5+NB17WuAqh6caDrpngT+5456VhJYjHne/g=;
	h=Date:To:Subject:In-Reply-To:References:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	From;
	b=JdfPceNK6F/Jhg5LzVR50R0DqohewPGheoR8+bL1c4kXkJjfva1OP/7WdLC745t/n
	BfyTX92Xms3NERiB1UG9yJYMwbgKHRW/hAOxr3Qxgfq32q8LW0SmmkXeFWnhV5TcI1
	KrsnICh0QRfSOwHXkh8abijvoY5NiPmChQ8UzoBM=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.3.2 sourceware.org 6873C388A809
DKIM-Filter:	OpenDKIM Filter v2.10.3 conssluserg-01.nifty.com 077FYUfU014724
X-Nifty-SrcIP:	[124.155.38.192]
Date:	Sat, 8 Aug 2020 00:34:43 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: Race condition hangs on multiple mintty/tcsh? Brad Wetmore
Message-Id:	<20200808003443.b814aa782511a57f3af6e849@nifty.ne.jp>
In-Reply-To:	<ba97e41f-6e7e-fec4-9426-7a1b7a2037ea@towo.net>
References:	<BYAPR07MB59428411CD00101EF02400B4B64D0 AT BYAPR07MB5942 DOT namprd07 DOT prod DOT outlook DOT com>
	<ff57a2c8-6753-02d6-7a85-9657d70bc897 AT towo DOT net>
	<1988bd34-7a17-e70f-bf23-0044f30c8687 AT towo DOT net>
	<1193403444 DOT 420395 DOT 1596669799506 AT mail DOT yahoo DOT com>
	<cc296c5f-c958-21bf-3a14-9584180de591 AT towo DOT net>
	<3d594543-c992-a22c-4631-f786cf34f76b AT towo DOT net>
	<20200806142614 DOT GH1107715 AT calimero DOT vinschen DOT de>
	<ba97e41f-6e7e-fec4-9426-7a1b7a2037ea AT towo DOT net>
X-Mailer:	Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version:	1.0
X-Spam-Status:	No, score=-3.1 required=5.0 tests=BAYES_00, DKIM_SIGNED,
	DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A,
	RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS,
	TXREP autolearn=no autolearn_force=no version=3.4.2
X-Spam-Checker-Version:	SpamAssassin 3.4.2 (2018-09-13) on
	server2.sourceware.org
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.29
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Errors-To:	cygwin-bounces AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces AT cygwin DOT com>
X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 077FZPDQ008779

Hi Thomas,

On Thu, 6 Aug 2020 16:33:36 +0200
Thomas Wolff wrote:
> Am 06.08.2020 um 16:26 schrieb Corinna Vinschen:
> > On Aug  6 15:31, Thomas Wolff wrote:
> >> Am 06.08.2020 um 13:46 schrieb Thomas Wolff:
> >>> Am 06.08.2020 um 01:23 schrieb Kevin Schnitzius via Cygwin:
> >>>> On Wednesday, August 5, 2020, 06:56:48 PM EDT, Thomas Wolff
> >>>> <towo AT towo DOT net> wrote:
> >>>>> Am 04.08.2020 um 12:02 schrieb Thomas Wolff:
> >>>>>> Am 04.08.2020 um 00:13 schrieb Brad Wetmore via Cygwin:
> >>>>>>> Hi,
> >>>>>>>
> >>>>>>> I generally kick off multiple (10) mintty sessions, and place them
> >>>>>>> around the screen.
> >>>>>>>
> >>>>>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \
> >>>>>> --position @3 --position 120,0 --size 80x71 /bin/tcsh &
> >>>>>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \
> >>>>>>> --position @3 --position 715,0 --size 80x45 /bin/tcsh &
> >>>>>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \
> >>>>>>> --position @3 --position 715,660 --size 80x24 /bin/tcsh &
> >>>>>>>
> >>>>>>> Within the last 6 months or so, about 2-3 of them would hang and
> >>>>>>> either mintty/tcsh would not start. I put a "sleep 1" in between each
> >>>>>>> invocation and that seemed to take care of it.
> >>>>>>>
> >>>>>>> With the latest cygwin update, about 8 of them just hang even with
> >>>>>>> the sleep 1. I put in a "sleep 2", and now everything is coming up
> >>>>>>> again.
> >>>>>>>
> >>>>>>> Not sure if this is a mintty or tcsh issue, but just wondering if
> >>>>>>> others are seeing this before I start trying to debug this.
> >>>>>> I can reproduce such behaviour with /bin/bash (easy cross-check), and
> >>>>>> in fact the shell is running in that case (easy test via `echo >
> >>>>>> .log`), so I have a vague and unpleasant suspicion it might in fact be
> >>>>>> related to mintty although I have no idea how that would happen. To be
> >>>>>> analysed.
> >>>>> When in this state, on the pty from which mintty receives child process
> >>>>> output, select() does not report a ready for reading condition;
> >>>>> could it
> >>>>> be related to the recent poll/select patch? I could not reproduce it in
> >>>>> cygwin 3.0.7.
> >>>> for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ; do
> >>>> mintty  -i /Cygwin-Terminal.ico  --position @3 --position 120,$i
> >>>> --size 80x24 /bin/bash & done
> >>>>
> >>>> This does not fail for me.  Nor does it fail from cmd or powershell
> >>>> using a script.
> >>>>
> >>>> I tried 3.1.4 and 3.1.6 on Windows 10.  I tried up to 100 instances
> >>>> of of mintty...
> >>> Thanks for testing. It is in fact hard to reproduce, maybe also
> >>> depending on system load (speculating).
> >>> I could reproduce one case of one of three terminals being unresponsive
> >>> also with xterm.
> >> And it also happens if I drop select() from mintty (and use just
> >> non-blocking read()).
> >>> Does anybody familiar with pty/select or recent changes have any idea?
> >> ?
> > Something with the pseudo console?  Can you test w/o pseudo console code, just to check?
> Hmm, CYGWIN=disable_pcon does not seem to disable ConPTY support for me 
> any more...

CYGWIN=disable_pcon needs to be set before opening pty, i.e.
before opening mintty. It works for me with cygwin 3.1.6.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -