X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D786B39A1805
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1628258474;
	bh=174v9RF/E7tUS+2tRns/en6HMq4BaPxTZahktsfHLSI=;
	h=Date:To:Subject:References:In-Reply-To:List-Id:List-Unsubscribe:
	 List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	 From;
	b=qaGkijzfRCU9Jo+dy79GY/OaaAySWBzQoMd4ekozNGlGeaEiAzR65rOvxxtkdpqJT
	 dMFk7sPNiiCJbEK5Uh5Lt8KzwtsnoJP80q38vSDHHrhVwg22uRVyqrkAYn9EoL5NmQ
	 O6FYNUf9WJG8RiKobN0hMSAkconFjmxC8ikQJXD8=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 394CE39A183F
Date: Fri, 6 Aug 2021 15:59:01 +0200
To: cygwin AT cygwin DOT com
Subject: Re: SSHD causes 100% CPU load
Message-ID: <YQ1AJTR2dESNEqF8@calimero.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <145999495 DOT 20210426124252 AT cfos DOT de>
 <1342428656 DOT 20210428072302 AT yandex DOT ru>
 <20210805191242 DOT b29a3904cbc4d082bdc3dd37 AT nifty DOT ne DOT jp>
 <YQv+rEqA8WiWdkVA AT calimero DOT vinschen DOT de>
 <20210806014331 DOT 899fb21f181e664663c328ae AT nifty DOT ne DOT jp>
 <20210806105507 DOT 47c573639b0762ba91828023 AT nifty DOT ne DOT jp>
 <YQz8qckm2wWhGzKK AT calimero DOT vinschen DOT de>
 <20210806201403 DOT cbd0dcfb64bea6fe7712f813 AT nifty DOT ne DOT jp>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <20210806201403.cbd0dcfb64bea6fe7712f813@nifty.ne.jp>
X-Provags-ID: V03:K1:UEdZ3CKK93ZuVl8OJ3Jx0ZtPG9YvOkVJrzTJzGlp6U8cJ7KPh48
 SmCqdxvXC0ak88C3MZuauoHefaf/1iF2lnyK4Q3R4RDV+QCjkq+2Jg7RN5hK2eorMBYo0Dj
 9viOJKQXg0kS28FB5cgiCuijWR3jgRFts1trjJJJDCvKOC03L2D6T9m8zZ8u0jJB5dKel6s
 JgzmYS8EZ1T+e3t6/natA==
X-UI-Out-Filterresults: notjunk:1;V03:K0:Ek4ZIExkK+k=:AVKSjQ9y+/eMbYnIuunQqm
 gAR+hP2UuT3ZkXUz9bs1KGGRpGl1J/LHCrxjVCBt8xQbvMxFcIbasTImibF/NEJeNYmudE4Yt
 BQY5Y7wVOrofOQrqjonmylWBB1G0EDA/gdM8edQFLsXq7qlOQGbdvEVYp8LZpTmb7AtTMkvJm
 Q3F0dFtBHCcQAibKcYAOa5MMvK0AsxTy9c+8g2zVa7m7s79fycnHgt/zN/WgOfFzccoaJNhII
 q9L3GIyLXPRQos24LYfj/q3+XdtlHffP9XC8kQIYItVA6j++ea894fTpsn5MyVN5dKZz6yOky
 FJpwXYhDze+FfuZqzvuC5ebmLWMRiSA/VQCwpXuc55/Q88RQ9HFfYjZU/nmn+yK1G0dojYjn8
 nhL0fz2h3Od/ucmzn6/DeOOCW9I+77MroTdW/409FYUSOOCykzrRA5GJdFtpuf00pM3scrpwr
 tKYIt6ucEd8iGnEkE3ESEd+s4kAGrXZEhK4br1bl67BeknIoz50ay3TPjzif3rfQrJkeQ7zOC
 r/IkweInXO5cPMhxZUQ9nSs5qDTE3a+vl23fkFwGHjCbNvSCe+o/fEehVyLviiiowiC1Xi6DS
 mWDJkQKJhCsYBv8OgYlekSsDw0rUOO/wkpykXH5C/hO8gYBAs2s5WvbC4fN2ORS8fm17ZlmuT
 oEyw3B3qGrH5xP7nAAXinQqr6k9Ypt9BvSqSVXjBhHmAul20gkrmcjpNhBfgBrovKtCXEan7R
 4aYmKsIzKg86lz3ALkkQTvEQoWEVGIifelYLo0F7CMgpTpbv6gmiPpElxLsxAzG+eGeIY2T8Y
 0BFQWNaW9yrs80mxDKSF/myavRVZCQmwJm+sy890NAGJO1xS+9Wg/d5Y+RGJ+wovxzWbdO8EG
 KRG9NYei6e1NgBHUF9IQ==
X-Spam-Status: No, score=-99.9 required=5.0 tests=BAYES_00,
 GOOD_FROM_CORINNA_CYGWIN, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS,
 RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NEUTRAL,
 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: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
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>

On Aug  6 20:14, Takashi Yano via Cygwin wrote:
> On Fri, 6 Aug 2021 11:11:05 +0200
> Corinna Vinschen wrote:
> > On Aug  6 10:55, Takashi Yano via Cygwin wrote:
> > > Hi Corinna,
> > > 
> > > On Fri, 6 Aug 2021 01:43:31 +0900
> > > Takashi Yano wrote:
> > > > Hi Corinna,
> > > > 
> > > > On Thu, 5 Aug 2021 17:07:24 +0200
> > > > Corinna Vinschen wrote:
> > > > > Could you perhaps bisect the issue on your machine?
> > > > 
> > > > In my environment, this does not happen with 8.4p1-1 and 8.4p1-2.
> > > > However it happens with 8.5p1-1.
> > > > [...]
> > > I looked into the openssh code and might find a calprit.
> > > I guess the following patch solves the issue.
> > > 
> > > --- serverloop.c.orig	2021-03-02 19:31:47.000000000 +0900
> > > +++ serverloop.c	2021-08-06 10:41:55.439357200 +0900
> > > @@ -333,7 +333,7 @@
> > >  			return -1;
> > >  		} else if (len == -1) {
> > >  			if (errno == EINTR || errno == EAGAIN ||
> > > -			    errno != EWOULDBLOCK)
> > > +			    errno == EWOULDBLOCK)
> > >  				return 0;
> > >  			verbose("Read error from remote host %s port %d: %s",
> > >  			    ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
> > > 
> > > 
> > > This seems to be a upstream bug which has been already fixed.
> > > 
> > > Please refer to:
> > > https://github.com/openssh/openssh-portable/commit/2dc328023f60212cd29504fc05d849133ae47355
> > 
> > Gosh, looks like I totally missed the 8.6p1 release!
> > 
> > I'll build and upload 8.6p1 ASAP.
> 
> I have confirmed that the issue has been fixed in 8.6p1-1.

Great, thanks for testing!


Corinna

-- 
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