From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Fjellstrom Subject: kvm linux guest hanging for minutes at a time Date: Sun, 7 Aug 2011 08:06:59 -0600 Message-ID: <201108070806.59194.thomas@fjellstrom.ca> Reply-To: thomas@fjellstrom.ca Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "kvm@vger.kernel.org" Return-path: Received: from mail.tomasu.net ([64.85.170.232]:53049 "EHLO mail.tomasu.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753122Ab1HGON5 (ORCPT ); Sun, 7 Aug 2011 10:13:57 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Occasionally when there's heavy cpu and/or io load, a kvm guest will lock up for minutes at a time, last occurrence was for about 12 minutes or so, and the guest itself reported: [1992982.639514] Clocksource tsc unstable (delta = -747307707123 ns) in dmesg after it came back. The only other hint as to what is going on is that the irq count for "local timer requests", virtio-input and virtio- requests spikes rather high. Also one of the cpu cores on the host was pegged the entire time. The last thing to cause a hang was an "aptitude upgrade" in the guest, which was a bit behind, so it had to update over 300 packages. The host is running 2.6.38-1-amd64 (2.6.38+32) from debian, qemu-kvm 0.14.0, and the guest was running 2.6.38-2-amd64 (not sure on the + number). Is this a known problem, thats hopefully fixed in newer kernels and qemu/kvm packages? Thanks -- Thomas Fjellstrom thomas@fjellstrom.ca