From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54189) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YVPyD-00072J-GF for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:37:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YVPyA-0007Re-4H for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:37:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56749) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YVPy9-0007Ra-Rz for qemu-devel@nongnu.org; Tue, 10 Mar 2015 15:37:34 -0400 Date: Tue, 10 Mar 2015 19:37:28 +0000 From: "Dr. David Alan Gilbert" Message-ID: <20150310193727.GQ2338@work-vm> References: <20150310165755.GL2338@work-vm> <54FF337A.1010202@redhat.com> <54FF4541.9080608@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <54FF4541.9080608@redhat.com> Subject: Re: [Qemu-devel] E5-2620v2 - emulation stop error List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Bandan Das , Andrey Korolyov , "qemu-devel@nongnu.org" , "kvm@vger.kernel.org" * Paolo Bonzini (pbonzini@redhat.com) wrote: > > > 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. Oh yes, that helps: while true; do (sleep 5; echo -e '\001cq\n')|/opt/qemu-try-world3/bin/qemu-system-x86_64 -machine pc-i440fx-2.3,accel=kvm -m 8192 -smp 20 -nographic -device sga; done gets it under a minute on my other box; Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz (Running a 3.18) Dave > Paolo -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK