From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: setting time in guest with ntpdate results in VM hang Date: Mon, 27 Aug 2012 13:23:05 -0600 Message-ID: <503BC919.5020508@gmail.com> References: <5037A46F.7050104@sedsystems.ca> <20120824194345.GA16662@amt.cnet> <503BA71C.4000602@sedsystems.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Dale Swanston Return-path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:51980 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752558Ab2H0TXI (ORCPT ); Mon, 27 Aug 2012 15:23:08 -0400 Received: by pbbrr13 with SMTP id rr13so7958661pbb.19 for ; Mon, 27 Aug 2012 12:23:08 -0700 (PDT) In-Reply-To: <503BA71C.4000602@sedsystems.ca> Sender: kvm-owner@vger.kernel.org List-ID: On 8/27/12 10:58 AM, Dale Swanston wrote: > Good idea. I'll try that. > > But are there any tools available to determine what the VM is doing when > it appears hung? I've looked but haven't found much on debug or > diagnostics on a running VM. Any links? If you have the vmlinux, enable the gdbserver stub via Qemu's monitor. Then use 'gdb vmlinux', connect to the VM 'target remote host:port' and look at the backtrace. I have seen something similar using kvm-clock in a guest running 2.6.27. David