From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Andr=E9_Weidemann?= Subject: Re: Qemu-KVM 0.12.3 and Multipath -> Assertion Date: Tue, 04 May 2010 07:38:09 +0200 Message-ID: <4BDFB2C1.5050802@web.de> References: <4BDF3F94.1080608@dlh.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org To: Peter Lieven Return-path: Received: from fmmailgate01.web.de ([217.72.192.221]:34771 "EHLO fmmailgate01.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751352Ab0EDFiP (ORCPT ); Tue, 4 May 2010 01:38:15 -0400 In-Reply-To: <4BDF3F94.1080608@dlh.net> Sender: kvm-owner@vger.kernel.org List-ID: Hi Peter, On 03.05.2010 23:26, Peter Lieven wrote: > Hi Qemu/KVM Devel Team, > > i'm using qemu-kvm 0.12.3 with latest Kernel 2.6.33.3. > As backend we use open-iSCSI with dm-multipath. > > Multipath is configured to queue i/o if no path is available. > > If we create a failure on all paths, qemu starts to consume 100% > CPU due to i/o waits which is ok so far. > > 1 odd thing: The Monitor Interface is not responding any more ... > > What es a really blocker is that KVM crashes with: > kvm: /usr/src/qemu-kvm-0.12.3/hw/ide/internal.h:507: bmdma_active_if: > Assertion `bmdma->unit !=3D (uint8_t)-1' failed. > > after the multipath has reestablisched at least one path. > > Any ideas? I remember this was working with earlier kernel/kvm/qemu > versions. I have the same issue on my machine, although I am using local storage=20 (LVM or a physical disk) to write my data to. I reported the "Assertion failed" on March 17th to the list. Marcello=20 and Avi had asked some question back then, but I don't know if they hav= e=20 come up with a fix for it. Regards Andr=E9 From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O9Azl-0001lH-2S for qemu-devel@nongnu.org; Tue, 04 May 2010 01:48:37 -0400 Received: from [140.186.70.92] (port=59889 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O9Azi-0001dE-C2 for qemu-devel@nongnu.org; Tue, 04 May 2010 01:48:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O9Apk-0002zh-J1 for qemu-devel@nongnu.org; Tue, 04 May 2010 01:38:17 -0400 Received: from fmmailgate01.web.de ([217.72.192.221]:34769) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O9Apk-0002zU-Cy for qemu-devel@nongnu.org; Tue, 04 May 2010 01:38:16 -0400 Message-ID: <4BDFB2C1.5050802@web.de> Date: Tue, 04 May 2010 07:38:09 +0200 From: =?ISO-8859-1?Q?Andr=E9_Weidemann?= MIME-Version: 1.0 References: <4BDF3F94.1080608@dlh.net> In-Reply-To: <4BDF3F94.1080608@dlh.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: Andre.Weidemann@web.de Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] Re: Qemu-KVM 0.12.3 and Multipath -> Assertion List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Lieven Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org Hi Peter, On 03.05.2010 23:26, Peter Lieven wrote: > Hi Qemu/KVM Devel Team, > > i'm using qemu-kvm 0.12.3 with latest Kernel 2.6.33.3. > As backend we use open-iSCSI with dm-multipath. > > Multipath is configured to queue i/o if no path is available. > > If we create a failure on all paths, qemu starts to consume 100% > CPU due to i/o waits which is ok so far. > > 1 odd thing: The Monitor Interface is not responding any more ... > > What es a really blocker is that KVM crashes with: > kvm: /usr/src/qemu-kvm-0.12.3/hw/ide/internal.h:507: bmdma_active_if: > Assertion `bmdma->unit !=3D (uint8_t)-1' failed. > > after the multipath has reestablisched at least one path. > > Any ideas? I remember this was working with earlier kernel/kvm/qemu > versions. I have the same issue on my machine, although I am using local storage=20 (LVM or a physical disk) to write my data to. I reported the "Assertion failed" on March 17th to the list. Marcello=20 and Avi had asked some question back then, but I don't know if they have=20 come up with a fix for it. Regards Andr=E9