From owner-freebsd-arm@FreeBSD.ORG Fri Nov 1 17:53:47 2013 Return-Path: Delivered-To: freebsd-arm@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 0ED6F713 for ; Fri, 1 Nov 2013 17:53:47 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from mho-02-ewr.mailhop.org (mho-02-ewr.mailhop.org [204.13.248.72]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id D426B2D67 for ; Fri, 1 Nov 2013 17:53:46 +0000 (UTC) Received: from c-24-8-230-52.hsd1.co.comcast.net ([24.8.230.52] helo=damnhippie.dyndns.org) by mho-02-ewr.mailhop.org with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.72) (envelope-from ) id 1VcIun-0009q6-JX; Fri, 01 Nov 2013 17:53:45 +0000 Received: from [172.22.42.240] (revolution.hippie.lan [172.22.42.240]) by damnhippie.dyndns.org (8.14.3/8.14.3) with ESMTP id rA1HrhSL057258; Fri, 1 Nov 2013 11:53:43 -0600 (MDT) (envelope-from ian@FreeBSD.org) X-Mail-Handler: Dyn Standard SMTP by Dyn X-Originating-IP: 24.8.230.52 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX18chZXjLkJXTCBr1XjQKdbO Subject: Re: sshd crash From: Ian Lepore To: Jia-Shiun Li In-Reply-To: References: <1383313834.31172.65.camel@revolution.hippie.lan> Content-Type: text/plain; charset="us-ascii" Date: Fri, 01 Nov 2013 11:53:43 -0600 Message-ID: <1383328423.31172.92.camel@revolution.hippie.lan> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 FreeBSD GNOME Team Port Content-Transfer-Encoding: 7bit Cc: "freebsd-arm@freebsd.org" , Howard Su X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Nov 2013 17:53:47 -0000 On Sat, 2013-11-02 at 01:44 +0800, Jia-Shiun Li wrote: > On Fri, Nov 1, 2013 at 9:50 PM, Ian Lepore wrote: > > > > Several people investigated this (pretty extensively) and didn't come up > > with a solution, or even a good suspect. We haven't forgotten it by any > > means, but I don't think anyone is knocking themselves out on it right > > now either. > > > > A fresh look may be exactly what's needed, so feel free to dig into it. > > > > I'll summarize what I remember... It happens on armv4 and armv6. It > > happens when kernel and world are built with clang or gcc. It happens > > with eabi and oabi. > > > > What I can't remember is whether anyone has bisected things down to a > > changeset or timeframe when the problem showed up. > > > > may I add: putty causes this to happen. mine 0.62. But ssh from another > FreeBSD host has no problem. > > I suspect it to be some issues related to memory or malloc issues > specific to bbb. 'tmux a -d' without existing detached sessions > causes tmux client to core dump. But sshd and it are both fine on rpi. > > -Jia-Shiun. This is the first I've heard of being able to ssh to an arm platform that doesn't have PrivSep disabled, since about July or so. I've never heard a report yet that anything on the client side could make a difference. It's definitely not a beaglebone thing, it happens on every arm board I've got... dreamplug, rpi, bbw, imx53, wandboard. -- Ian