From owner-freebsd-stable@FreeBSD.ORG Wed Jan 23 02:04:27 2013 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 88AA0BFD for ; Wed, 23 Jan 2013 02:04:27 +0000 (UTC) (envelope-from bryanv@daemoninthecloset.org) Received: from torment.daemoninthecloset.org (ip-static-94-242-209-234.as5577.net [94.242.209.234]) by mx1.freebsd.org (Postfix) with ESMTP id 48AC518F for ; Wed, 23 Jan 2013 02:04:26 +0000 (UTC) Received: from sage.daemoninthecloset.org (unknown [70.114.209.60]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "sage.daemoninthecloset.org", Issuer "daemoninthecloset.org" (verified OK)) by torment.daemoninthecloset.org (Postfix) with ESMTPS id 1929D42C2520; Wed, 23 Jan 2013 03:06:42 +0100 (CET) X-Virus-Scanned: amavisd-new at daemoninthecloset.org X-Virus-Scanned: amavisd-new at daemoninthecloset.org Date: Tue, 22 Jan 2013 20:04:12 -0600 (CST) From: Bryan Venteicher To: Franz Schwartau Message-ID: <1366804865.5.1358906652665.JavaMail.root@daemoninthecloset.org> In-Reply-To: <50FE627C.7070701@electromail.org> References: <2103527496.1667.1351994019607.JavaMail.root@daemoninthecloset.org> <50FE627C.7070701@electromail.org> Subject: Re: kvm vlan virtio problem MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.10.200] X-Mailer: Zimbra 8.0.2_GA_5569 (ZimbraWebClient - GC24 (Mac)/8.0.2_GA_5569) Thread-Topic: kvm vlan virtio problem Thread-Index: by8VpTAtISXOQf7YbIhqSf5VHzywYw== Cc: freebsd-stable@freebsd.org, bane ivosev X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Jan 2013 02:04:27 -0000 Hi, ----- Original Message ----- > Hi! > > The same warning shows up in our setup: > > Jan 21 23:40:46 host kernel: WARNING: at net/core/dev.c:1712 > skb_gso_segment+0x1df/0x2b0() (Tainted: G W --------------- ) > Jan 21 23:40:46 host kernel: Hardware name: System Product Name > Jan 21 23:40:46 host kernel: tun: caps=(0x1b0049, 0x0) len=4452 > data_len=4380 ip_summed=0 > [...] > > KVM host: CentOS 6.3, Linux kernel 2.6.32-279.19.1.el6.x86_64 > VM guest: FreeBSD 9.1, virtio-kmod-9.1-0.242658 > > Disabling TSO on vtnet0 stops the warnings on the KVM host. > > Is there any progress on this issue? > It seems the only way this could happen is if the FreeBSD TCP/IP stack sent down an mbuf with CSUM_TSO set and CSUM_TCP not set; this doesn't seem possible from looking at FreeBSD's tcp_output(). I'll try to look closer at this during this week. Bryan > Best regards > Franz >