From owner-freebsd-stable@FreeBSD.ORG  Sun Jan  5 10:41:27 2014
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id E1E6529A
 for <freebsd-stable@freebsd.org>; Sun,  5 Jan 2014 10:41:27 +0000 (UTC)
Received: from mail.server1.bsdforen.de (bsdforen.de [82.193.243.81])
 by mx1.freebsd.org (Postfix) with ESMTP id A620713F0
 for <freebsd-stable@freebsd.org>; Sun,  5 Jan 2014 10:41:27 +0000 (UTC)
Received: from mobileKamikaze.norad (unknown [5.158.138.185])
 (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by mail.server1.bsdforen.de (Postfix) with ESMTPSA id DDF5E86184
 for <freebsd-stable@freebsd.org>; Sun,  5 Jan 2014 11:41:19 +0100 (CET)
Message-ID: <52C936CD.8030000@bsdforen.de>
Date: Sun, 05 Jan 2014 11:41:17 +0100
From: Dominic Fandrey <kamikaze@bsdforen.de>
MIME-Version: 1.0
To: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>
Subject: System unresponsive during FS activity
Content-Type: text/plain; charset=ascii
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 05 Jan 2014 10:41:27 -0000

I'm running stable/10 r260037:
FreeBSD mobileKamikaze.norad 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #6 r260037: Sun Dec 29 14:58:09 CET 2013     root@mobileKamikaze.norad:/usr/obj/HP6510b-10/amd64/usr/src/sys/HP6510b-10  amd64

While moving a large file from a nullfs mount to a UFS+SU mount
(the nullfs mount is on the same UFS+SU mount) the system becomes fully
unresponsive.

I.e.:
- X freezes and doesn't react:
  - Screen frozen
  - Mouse cursor does not move
  - No keyboard interactions
- CTLR-ALT-Fn into the console does not work
- Skype video calls freeze and break down

When the mv is completed the system is fully responsive again.

Regards

-- 
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?