From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754449Ab1FCKDF (ORCPT ); Fri, 3 Jun 2011 06:03:05 -0400 Received: from mo-p00-ob.rzone.de ([81.169.146.160]:23792 "EHLO mo-p00-ob.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754405Ab1FCKDD (ORCPT ); Fri, 3 Jun 2011 06:03:03 -0400 X-RZG-AUTH: :IGUXYVOIf/Z0yAghYbpIhzghmj8icP68r1arC3zTx2B9G7/f7yb6+x1CF1B3oIP27v4= X-RZG-CLASS-ID: mo00 Message-ID: <4DE8B13D.9020302@die-jansens.de> Date: Fri, 03 Jun 2011 12:02:37 +0200 From: Arne Jansen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: Peter Zijlstra CC: Linus Torvalds , mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, efault@gmx.de, npiggin@kernel.dk, akpm@linux-foundation.org, frank.rowand@am.sony.com, tglx@linutronix.de, mingo@elte.hu, linux-tip-commits@vger.kernel.org Subject: Re: [tip:sched/locking] sched: Add p->pi_lock to task_rq_lock() References: <20110405152729.232781355@chello.nl> <4DE64596.5010006@die-jansens.de> <1306946120.2497.606.camel@laptop> <4DE674EB.1000200@die-jansens.de> <1306951751.2497.626.camel@laptop> <1306953870.2497.627.camel@laptop> <4DE6936F.7090700@die-jansens.de> <1307092535.2353.2973.camel@twins> In-Reply-To: <1307092535.2353.2973.camel@twins> X-Enigmail-Version: 1.1.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03.06.2011 11:15, Peter Zijlstra wrote: > On Thu, 2011-06-02 at 06:09 +0900, Linus Torvalds wrote: >> Boot-time hang - maybe due to the mis-merge that re-introduced the >> infinite media change signals for ide-cd? >> >> I just pushed out a fix, it may not have mirrored out yet. >> >> I dunno. Worth checking out before spending a lot of time bisecting. > > Right, so that wasn't it. I haven't done a full bisect yet because I > noticed it died on a usb suspend line every single time and that machine > only had a single usb device, a memory stick, in it. So I simply pulled > the stick and voila it booted. So something is screwy with usb suspend > or something. > > This of course means that I'm now completely unable to reproduce the > issue at hand :/ > > Maybe if I try another box.. > > Anyway, Arne, how long did you wait before power cycling the box? The > NMI watchdog should trigger in about a minute or so if it will trigger > at all (its enabled in your config). No, it doesn't trigger, but the hang is not as complete as I first thought. A running iostat via ssh continues to give output for a while, the serial console still reacts to return and prompts for login. But after a while more and more locks up. The console locks as soon as I sysrq-t. Maybe it has also something to do with the place where I added the printks (btrfs_scan_one_device). Also the 10k-print gets triggered several times (though I only see 10 lines of output). Maybe you can send me your test-module and I'll try that, so we have more equal conditions. What also might help: the maschine I'm testing with is a quad-core X3450 with 8GB RAM.