X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 794923992021
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1628158419;
	bh=jL5dwwIgryTwTmcj+H8nKyT7jfzfK/qjQuwF2pGPaqs=;
	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=msF7hjCT1lXLMcpzdNb2g/p9UTw8+l9zb/7sPxDJggCYiZyRkGHJLOmEktmm+VLES
	 unyiP9zhn4KwKsi/FC+vFFcAABr4ORY0lcS6q035Eg6ZquGJIO3fDmOREElY5bRMje
	 p42eHDLMbiR64GSp9zEtkCE7JWZRu4ir0QdNCBiY=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 846BF3851C1E
DKIM-Filter: OpenDKIM Filter v2.10.3 conssluserg-01.nifty.com 175ACeL0007811
X-Nifty-SrcIP: [110.4.221.123]
Date: Thu, 5 Aug 2021 19:12:42 +0900
To: cygwin AT cygwin DOT com
Subject: Re: SSHD causes 100% CPU load
Message-Id: <20210805191242.b29a3904cbc4d082bdc3dd37@nifty.ne.jp>
In-Reply-To: <1342428656.20210428072302@yandex.ru>
References: <145999495 DOT 20210426124252 AT cfos DOT de>
 <1342428656 DOT 20210428072302 AT yandex DOT ru>
X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version: 1.0
X-Spam-Status: No, score=-3.6 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE,
 SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
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>
Content-Type: text/plain; charset="utf-8"
Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 175ADfje015248

Hi everyone,

On Wed, 28 Apr 2021 07:23:02 +0300
Andrey Repin <anrdaemon AT yandex DOT ru> wrote:

> Greetings, Christoph Lüders!
> 
> > I run cygwin 32-bit on Windows 10 Pro Build 19042.  Cygwin is 3.2.0-1,
> > openssh is 8.5p1-1.
> 
> > I use sshd to access the machine from afar.  I notice (often multiple)
> > processes of sshd.exe with 100% CPU load.
> 
> https://cygwin.com/pipermail/cygwin/2021-April/248299.html
> https://cygwin.com/pipermail/cygwin/2021-April/248309.html
> 
> > A stack shown with procexp has function names like
> > "cygwin1.dll!acl_get_perm" and "cygwin1.dll!_assert".
> 
> > Can anyone give me some advice how to proceed further?  I have updated
> > to the latest cygwin multiple times; reboot doesn't help either.

I have finally found how to reproduce this problem in my
environment. The reproduce steps are as follows.

1. Install cygwin sshd as a service and start it.
2. Connect to sshd by 'ssh user AT localhost ls' using **Windows** ssh.exe.
3. Check if sshd remains with high CPU load.

I have confirmed that this issue happens in a few my PCs.

Corinna, could you please have a look?

-- 
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