From owner-freebsd-virtualization@freebsd.org Tue Mar 15 21:41:16 2016 Return-Path: Delivered-To: freebsd-virtualization@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1088CAD140D for ; Tue, 15 Mar 2016 21:41:16 +0000 (UTC) (envelope-from neelnatu@gmail.com) Received: from mail-qk0-x229.google.com (mail-qk0-x229.google.com [IPv6:2607:f8b0:400d:c09::229]) (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 CB8052BFD for ; Tue, 15 Mar 2016 21:41:15 +0000 (UTC) (envelope-from neelnatu@gmail.com) Received: by mail-qk0-x229.google.com with SMTP id s5so13214259qkd.0 for ; Tue, 15 Mar 2016 14:41:15 -0700 (PDT) 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 :cc; bh=eqRAJzn/RcFGZ4Ybzoriz4ZkOeqImVc3c8yJc9kXbbE=; b=GI2X/8MltN6JAlvlD7tdaKD38ifMX6r4aOtvzKD2iChbCvBS3EUPqK1el5/oX0VJ9A gr0+7HQGA0jjNKEAbHiQXUaqMZFDS8FvdDCC3xG9RV8RrTG2X+3Um6A/N+YU6V5AKyEM tZDCB4Qh39AFBWoxY/RFgzcZL7ua1XbZczjtym165CSG5ieKTpZ5vxTmwppbcFHGhTKh ul4yduDHrPhMfH5tGZETOSlXBCHCECCes11C+b5xZeJeS8oR0Mys0arlqtxJeYSVZPfS rZ63DFgAzwbbMmC9a9BJTR2udDxqBnmtBVjR7QdI10F4FEgqkgpGtPry8ZpVpHdo/GaZ WF1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc; bh=eqRAJzn/RcFGZ4Ybzoriz4ZkOeqImVc3c8yJc9kXbbE=; b=O2TCpAto8Jsg1/VSqv1K4v0SI6OdKRd9nCYj5PMcNNPuRUUSyRzv+Yc42B9Kr4KV2V vw6fbFc/w7KP+JESKR/1opRMqYGcXA+b3T9V3QkgToe7lvbLwaDaN+6blcg2fGod5t11 c0OaHH1mgWv+d+Vb2IqVR1NiuHYNa83lSXlE9TsZ1niPy5g1SLV4YThHGx/taqhOGNh+ +CSIenVhWvWVzQdv+fhZsOAu8Ghhn6OpbemNhLhbzNejnTxjklqoctdYfcOqIf1C7KFr 0J/C7ofKTLkXBcG4rf4FaSNUqUZXf+WytC+S0v96gnlW4rNlnS4tr/bvr3CRjelN+3Vs dQ5Q== X-Gm-Message-State: AD7BkJJgxy2bX7HV4Co5Q0zBQG8YRB/sDlHmCf33R8JmRri4H8dT869mt4BYHBpLom8zwbu9j5W2ZcBjL9NXNw== MIME-Version: 1.0 X-Received: by 10.55.221.18 with SMTP id n18mr453913qki.50.1458078074804; Tue, 15 Mar 2016 14:41:14 -0700 (PDT) Received: by 10.140.43.6 with HTTP; Tue, 15 Mar 2016 14:41:14 -0700 (PDT) In-Reply-To: <23329.1458077441@critter.freebsd.dk> References: <20918.1458052609@critter.freebsd.dk> <23329.1458077441@critter.freebsd.dk> Date: Tue, 15 Mar 2016 14:41:14 -0700 Message-ID: Subject: Re: -current host, 10.1 client loops From: Neel Natu To: Poul-Henning Kamp Cc: "freebsd-virtualization@freebsd.org" Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Mar 2016 21:41:16 -0000 Hi, On Tue, Mar 15, 2016 at 2:30 PM, Poul-Henning Kamp wrote: > -------- > In message > , Neel Natu writes: > >>Also, if it is possible to reproduce with a single vcpu then it will >>help when analyzing the output of ktrdump. > > Well, on the gutfeeling that it might help I gave a '-c 1' and that > seems to prevent the problem from happening so I could get my builds > done. > > So some kind of synchronization issue maybe ? > Yes, that might be possible. A couple of suggestions to narrow it down further: - try to reproduce with 2 or 4 vcpus (3 cpus is probably not a well tested configuration) - try to reproduce with the ahci-hd device emulation instead of virtio-blk. If this problem is reproducible then I am happy to work with you to get to the bottom of this. best Neel > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence.