From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: Commit 7eaceaccab5f40 causing boot hang. Date: Sat, 9 Apr 2011 05:00:19 +0200 Message-ID: <4D9FCBC3.9040206@fusionio.com> References: <201103291551.p2TFpDqZ001692@clem.clem-digital.net> <4D92C874.7040104@parallels.com> <4D931634.5030807@fusionio.com> <4D933584.5050005@parallels.com> <4D94432D.5080601@fusionio.com> <4D944544.9040705@parallels.com> <4D945247.4080404@fusionio.com> <4D945976.8000401@fusionio.com> <4D945BAD.10309@parallels.com> <4D9460F8.7080606@fusionio.com> <4D9FCAF6.5030301@parallels.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from mx2.fusionio.com ([64.244.102.31]:42940 "EHLO mx2.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751123Ab1DIDAY (ORCPT ); Fri, 8 Apr 2011 23:00:24 -0400 In-Reply-To: <4D9FCAF6.5030301@parallels.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Rob Landley Cc: Pete Clements , linux-kernel , "linux-ide@vger.kernel.org" , Tejun Heo On 2011-04-09 04:56, Rob Landley wrote: > On 03/31/2011 06:09 AM, Jens Axboe wrote: >> On 2011-03-31 12:47, Rob Landley wrote: >>> On 03/31/2011 05:37 AM, Jens Axboe wrote: >>>>>>> Can you send me your .config? >>>>>> >>>>>> It was attached to the first message in this series, here it is again. >>>>>> >>>>>> I update it via "make oldconfig" and hold down return. >>>>>> >>>>>> I boot it via: >>>>>> >>>>>> qemu-system-x86_64 -m 1024 -kernel arch/x86/boot/bzImage \ >>>>>> -hda ~/sid.ext3 -append "root=/dev/hda rw" >>>>> >>>>> Much better, I see the hang now! Now to try and diagnose... >>>> >>>> It seems to hard hang, looks very odd: >>> >>> I should have mentioned that: when it hangs, you can't page back up in >>> the console display anymore. >> >> Data point - only seems to happen on UP. If you add -smp X to kvm, then >> it boots and works just fine. It smells oddly like some sort of irq >> event. >> > > The workaround for this is to disable preemption, by the way. Indeed, I think those bits were mentioned earlier. I will get to this early next week, been away traveling and not back yet. -- Jens Axboe