From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Webb Subject: qemu-kvm guest which won't 'cont' (emulation failure?) Date: Mon, 24 Oct 2011 11:00:38 +0100 Message-ID: <20111024100037.GS9917@arachsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: qemu-devel@nongnu.org, kvm@vger.kernel.org Return-path: Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: kvm.vger.kernel.org I have a qemu-kvm guest (apparently a Ubuntu 11.04 x86-64 install) which has stopped and refuses to continue: (qemu) info status VM status: paused (qemu) cont (qemu) info status VM status: paused The host is running linux 2.6.39.2 with qemu-kvm 0.14.1 on 24-core Opteron 6176 box, and has nine other 2GB production guests on it running absolutely fine. It's been a while since I've seen one of these. When I last saw a cluster of them, they were emulation failures (big real mode instructions, maybe?). I also remember a message about abnormal exit in the dmesg previously, but I don't have that here. This time, there is no host kernel output at all, just the paused guest. I have qemu monitor access and can even strace the relevant qemu process if necessary: is it possible to use this to diagnose what's caused this guest to stop, e.g. the unsupported instruction if it's an emulation failure? Cheers, Chris.