From owner-freebsd-questions@FreeBSD.ORG Wed Jul 1 13:08:49 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3416D1065672 for ; Wed, 1 Jul 2009 13:08:49 +0000 (UTC) (envelope-from sonicy@otenet.gr) Received: from rosebud.otenet.gr (rosebud.otenet.gr [83.235.67.32]) by mx1.freebsd.org (Postfix) with ESMTP id 96DE38FC24 for ; Wed, 1 Jul 2009 13:08:48 +0000 (UTC) (envelope-from sonicy@otenet.gr) Received: from atomic.dyndns.org (athedsl-4493768.home.otenet.gr [94.71.93.208]) by rosebud.otenet.gr (8.13.8/8.13.8/Debian-3) with ESMTP id n61D8bQY020500; Wed, 1 Jul 2009 16:08:44 +0300 Message-ID: <4A4B5FD5.1090604@otenet.gr> Date: Wed, 01 Jul 2009 16:08:37 +0300 From: Manolis Kiagias User-Agent: Thunderbird 2.0.0.21 (X11/20090414) MIME-Version: 1.0 To: Nikos Vassiliadis References: <4A4B0E8E.4090501@otenet.gr> <4A4B2C64.4040508@gmx.com> In-Reply-To: <4A4B2C64.4040508@gmx.com> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-7 Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: Failing to show 'Password:' prompt X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Jul 2009 13:08:49 -0000 Nikos Vassiliadis wrote: > Manolis Kiagias wrote: >> This morning my server was unresponsive both from ssh and through >> http. The only thing that is different on this system on a 1st of >> month, is a dump job that runs through periodic (on a mostly inactive >> system). >> >> Visiting the console, I discovered the system was still up and >> displaying login prompt on all vtys, but after typing a username, the >> password prompt would never appear. Keyboard was responsive and I >> could even switch between keyboard layouts (English/Greek). Plugging >> and and unplugging an external USB drive, showed the kernel messages >> on tty0. Still, I could not get it to display a password prompt and >> had to hard reboot it. >> >> I can't find anything in /var/log/messages either - it stops at 5.25 >> in the morning. And the dump was not performed either (and there are >> no traces about it in the log). >> >> What kind of crash could cause the password prompt to not display? >> Ideas? > > Geia Manoli, > > A deadlock somewhere in the filesystem code would expose > such behavior. Other subsystems may continue to work, but > some operations, somehow related to that filesystem code, > will wait - forever - for some locks to be released. > > I've seen such behavior in early RELENG_6 branch with regard > to UFS snapshots. > > Nikos > > Thanks Niko, This is quite possible actually as I was using dump -L and the USB backup disk was still mounted when I looked at the console messages. I'll check the PR database for dump-related problems.