From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [Qemu-devel] E5-2620v2 - emulation stop error Date: Tue, 10 Mar 2015 20:25:53 +0100 Message-ID: <54FF4541.9080608@redhat.com> References: <20150310165755.GL2338@work-vm> <54FF337A.1010202@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: "Dr. David Alan Gilbert" , Andrey Korolyov , "qemu-devel@nongnu.org" , "kvm@vger.kernel.org" To: Bandan Das Return-path: Received: from mail-wg0-f51.google.com ([74.125.82.51]:33641 "EHLO mail-wg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751797AbbCJTZ7 (ORCPT ); Tue, 10 Mar 2015 15:25:59 -0400 Received: by wggz12 with SMTP id z12so4210469wgg.0 for ; Tue, 10 Mar 2015 12:25:57 -0700 (PDT) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 10/03/2015 19:21, Bandan Das wrote: > Paolo Bonzini writes: > >> On 10/03/2015 17:57, Dr. David Alan Gilbert wrote: >>> I'm seeing something similar; it's very intermittent and generally >>> happening right at boot of the guest; I'm running this on qemu >>> head+my postcopy world (but it's happening right at boot before postcopy >>> gets a chance), and I'm using a 3.19ish kernel. Xeon E5-2407 in my case >>> but hey maybe I'm seeing a different bug. > > Probably a tangent but is the qemu trace identical to what Andrey is seeing ? > From a cursory look and my limited understanding, it seems his failure is #GP > when executing video bios. > >> Same here on 3.16 + Xeon E5 v3 kernel. > > I will try to reproduce this on a v2. I see several failures, usually mine have suberror 1. With a 32-VCPU guest I can reproduce it roughly half of the time. Paolo From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51324) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YVPn0-0001D5-Kl for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:26:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YVPmw-0002tY-Km for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:26:02 -0400 Received: from mail-wi0-x230.google.com ([2a00:1450:400c:c05::230]:46243) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YVPmw-0002tO-D7 for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:25:58 -0400 Received: by wiwh11 with SMTP id h11so5744056wiw.5 for ; Tue, 10 Mar 2015 12:25:57 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <54FF4541.9080608@redhat.com> Date: Tue, 10 Mar 2015 20:25:53 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <20150310165755.GL2338@work-vm> <54FF337A.1010202@redhat.com> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] E5-2620v2 - emulation stop error List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Bandan Das Cc: Andrey Korolyov , "Dr. David Alan Gilbert" , "kvm@vger.kernel.org" , "qemu-devel@nongnu.org" On 10/03/2015 19:21, Bandan Das wrote: > Paolo Bonzini writes: > >> On 10/03/2015 17:57, Dr. David Alan Gilbert wrote: >>> I'm seeing something similar; it's very intermittent and generally >>> happening right at boot of the guest; I'm running this on qemu >>> head+my postcopy world (but it's happening right at boot before postcopy >>> gets a chance), and I'm using a 3.19ish kernel. Xeon E5-2407 in my case >>> but hey maybe I'm seeing a different bug. > > Probably a tangent but is the qemu trace identical to what Andrey is seeing ? > From a cursory look and my limited understanding, it seems his failure is #GP > when executing video bios. > >> Same here on 3.16 + Xeon E5 v3 kernel. > > I will try to reproduce this on a v2. I see several failures, usually mine have suberror 1. With a 32-VCPU guest I can reproduce it roughly half of the time. Paolo