From owner-freebsd-xen@FreeBSD.ORG Mon Mar 17 17:00:18 2014 Return-Path: Delivered-To: freebsd-xen@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 ESMTPS id A6BEC7A1 for ; Mon, 17 Mar 2014 17:00:18 +0000 (UTC) Received: from mail.tdx.com (mail.tdx.com [62.13.128.18]) by mx1.freebsd.org (Postfix) with ESMTP id 6F115CD0 for ; Mon, 17 Mar 2014 17:00:14 +0000 (UTC) Received: from Mail-PC.tdx.co.uk (storm.tdx.co.uk [62.13.130.251]) (authenticated bits=0) by mail.tdx.com (8.14.3/8.14.3/) with ESMTP id s2HGx7nu089344 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 17 Mar 2014 16:59:07 GMT Date: Mon, 17 Mar 2014 16:59:06 +0000 From: Karl Pielorz To: freebsd-xen@FreeBSD.org Subject: FBSD 10.0-S (r261289M) under XenServer 6.2 - Stuck sshd in urdlck? Message-ID: <4B8380EBE379080FAD3271FA@Mail-PC.tdx.co.uk> X-Mailer: Mulberry/4.0.8 (Win32) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Mar 2014 17:00:18 -0000 Hi, I setup a VM a while ago under XenServer 6.2 - it's an amd64 FBSD 10.0-S box (based on r261289) - it's running under Xen PVHVM. I set it up - and left it for a while (46 days). I went to ssh to it today, and got: " ssh_exchange_identification: Connection closed by remote host " Getting on to the boxes console there's lots of what look to be 'stuck' sshd processes? 0 3933 895 0 20 0 84868 6944 urdlck Is - 0:00.01 sshd: unknown [priv] (sshd) 22 3934 3933 0 20 0 0 0 - Z - 0:00.00 0 3935 3933 0 20 0 84868 6952 sbwait I - 0:00.00 sshd: unknown [pam] (sshd) 0 4338 895 0 20 0 84868 6944 urdlck Is - 0:00.01 sshd: unknown [priv] (sshd) 22 4339 4338 0 20 0 0 0 - Z - 0:00.00 Anyone know what 'urdlck' is? There's 126 of these processes, e.g. 5446 - I 0:00.00 sshd: unknown [pam] (sshd) 5450 - Is 0:00.01 sshd: unknown [priv] (sshd) 5452 - I 0:00.00 sshd: unknown [pam] (sshd) 5453 - Is 0:00.01 sshd: unknown [priv] (sshd) Bearing in mind the box is firewalled from ssh access, and no one (apart from me today) has attempted to get onto the box with ssh - this is a little concerning. Every about 5-10 connects will actually 'connect' - the rest just result in the 'key exchange' error. Kernel is GENERIC with: options NO_ADAPTIVE_MUTEXES options NO_ADAPTIVE_RWLOCKS options NO_ADAPTIVE_SX There's nothing logged in dmesg, or syslog. Is there anything worth doing to this VM before I restart it - i.e. to try and figure out what's happened? / troubleshoot? -Karl