From owner-freebsd-hackers@FreeBSD.ORG Tue Feb 17 17:42:02 2015 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0050E206 for ; Tue, 17 Feb 2015 17:42:01 +0000 (UTC) Received: from mail-ie0-f175.google.com (mail-ie0-f175.google.com [209.85.223.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C4FD8795 for ; Tue, 17 Feb 2015 17:42:01 +0000 (UTC) Received: by iecrl12 with SMTP id rl12so40213868iec.4 for ; Tue, 17 Feb 2015 09:42:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=UKgqAgkBcRBeVi6oe4rrLDpQgu28WckFX4yDLYxDgbA=; b=c3q+PotTd3wVnV8ZyGFE9VS6tSclUWEm9dcMyQHz0p3NkZV+DPncvnp5XpFbGOrAdc WReJiCDZL8iP+ooIhBuGZc82+YVSlT+kqBLdS5x9cGq7oJIIsZ71qWsWO9qBI3UD3kMy cIVsoOzKM9GwEv0XTaM6L3z18qS0gf8VejGqxsH4R0+vHklwoJchp2iggjapz/Drfv38 05PNkRwgXDChF+j9lM31/rfk1ZBR0w2yCWWAA9CeDiQeXn3z06IKDziHDG6aFHE2kmTG ZaaBS2xlp4cVQeUCb3dL16IWbkNYl11VnSYvADUCha7px4eko2uZti+bAZifLWex9lQ4 RC8g== MIME-Version: 1.0 X-Received: by 10.107.3.20 with SMTP id 20mr36100810iod.92.1424194920936; Tue, 17 Feb 2015 09:42:00 -0800 (PST) Received: by 10.36.55.213 with HTTP; Tue, 17 Feb 2015 09:42:00 -0800 (PST) In-Reply-To: <20150217085851.GS34251@kib.kiev.ua> References: <20150217085851.GS34251@kib.kiev.ua> Date: Tue, 17 Feb 2015 12:42:00 -0500 Message-ID: Subject: Re: Kernel Panic From: Robert Simmons To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Feb 2015 17:42:02 -0000 On Tue, Feb 17, 2015 at 3:58 AM, Konstantin Belousov wrote: > On Tue, Feb 17, 2015 at 01:27:46AM -0500, Robert Simmons wrote: >> I'm experiencing a kernel panic on a VM: >> panic: CPU0 does not support X87 or SSE: 0 >> This is on OpenStack (using KVM). >> >> Is there a kernel option that I can set that will allow this VM to >> boot without panic? > The panic indicates that machine you trying to boot on is not compliant > with the Intel specification. You may try the luck with setting > hw.use_xsave=0 at the loader prompt, but I expect that you get other > problems. Thanks! This works and allows the VM to boot. The problem appears to be a bug in KVM virtualization, and it has been fixed upstream. I'm trying to get my cloud provider to patch their stack. You mentioned that this may introduce other problems. How bad and what kind of problems do you think may happen?