Date: Tue, 22 Jan 2013 20:04:12 -0600 (CST) From: Bryan Venteicher <bryanv@daemoninthecloset.org> To: Franz Schwartau <franz@electromail.org> Cc: freebsd-stable@freebsd.org, bane ivosev <bane.ivosev@pmf.uns.ac.rs> Subject: Re: kvm vlan virtio problem 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>
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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 >
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