I get this in dmesg every 10 or 15 minutes. I have 2 VM's working in XCP. One is Debian 6 and other is Windows 2008R2 with GPLPV drivers.
------------[ cut here ]------------ WARNING: at net/core/dev.c:1594 skb_gso_segment+0x1a1/0x250() Hardware name: IBM System x3400 M3 Server -[7379K4G]- netbk: caps=(0x50801, 0x0) len=2960 data_len=2836 ip_summed=0 Modules linked in: tun iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi lockd sunrpc 8021q openvswitch_mod llc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables binfmt_misc dm_mirror video output sbs sbshc fan container battery ac parport_pc lp parport nvram sr_mod cdrom thermal evdev cdc_ether sg usb_storage usbnet rtc_cmos 8250_pnp mii rtc_core tpm_tis pata_acpi 8250 tpm processor usb_libusual usbhid button thermal_sys bnx2 serio_raw serial_core rtc_lib tpm_bios ata_piix ata_generic libata i2c_i801 i2c_core pcspkr dm_region_hash dm_log dm_mod megaraid_sas sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd usbcore fbcon font tileblit bitblit softcursor [last unloaded: microcode] Pid: 1274, comm: netback/0 Tainted: G W 2.6.32.12-0.7.1.xs1.4.90.530.170661xen #1 Call Trace: [<c0307a01>] ? skb_gso_segment+0x1a1/0x250 [<c0307a01>] ? skb_gso_segment+0x1a1/0x250 [<c012e0ac>] warn_slowpath_common+0x7c/0xa0 [<c0307a01>] ? skb_gso_segment+0x1a1/0x250 [<c012e116>] warn_slowpath_fmt+0x26/0x30 [<c0307a01>] skb_gso_segment+0x1a1/0x250 [<c0307bf5>] dev_hard_start_xmit+0x145/0x3c0 [<c031941d>] sch_direct_xmit+0x16d/0x1f0 [<c030ae81>] dev_queue_xmit+0x291/0x4b0 [<f02f37e3>] netdev_send+0xe3/0x2e0 [openvswitch_mod] [<f02f193b>] vport_send+0x4b/0x110 [openvswitch_mod] [<f02e9164>] do_output+0x14/0x30 [openvswitch_mod] [<f02e9644>] execute_actions+0x4c4/0x650 [openvswitch_mod] [<c02ff624>] ? __kfree_skb+0x34/0x80 [<c02ff6d0>] ? kfree_skb+0x20/0x40 [<c0384fe6>] ? _spin_lock_bh+0x16/0x100 [<c0384e53>] ? _spin_unlock_bh+0x23/0x30 [<f02eda4d>] ? flow_used+0x5d/0x90 [openvswitch_mod] [<f02eb471>] dp_process_received_packet+0x91/0x200 [openvswitch_mod] [<f02f189b>] vport_receive+0x4b/0xa0 [openvswitch_mod] [<f02f3436>] netdev_frame_hook+0x46/0x90 [openvswitch_mod] [<c0306dcf>] netif_receive_skb+0x1af/0x660 [<c0122150>] ? __wake_up+0x40/0x50 [<c030a2a2>] process_backlog+0x92/0xe0 [<c030a019>] net_rx_action+0x159/0x230 [<c013358a>] __do_softirq+0xba/0x180 [<c01336c5>] do_softirq+0x75/0x80 [<c030781a>] netif_rx_ni+0x1a/0x20 [<c02afb2f>] net_tx_action+0xf5f/0x15c0 [<c0120287>] ? sched_avg_update+0x17/0xd0 [<c0382a29>] ? schedule+0x2e9/0x970 [<c02b0dbe>] netbk_action_thread+0x9e/0x1e0 [<c0142b10>] ? autoremove_wake_function+0x0/0x50 [<c02b0d20>] ? netbk_action_thread+0x0/0x1e0 [<c0142854>] kthread+0x74/0x80 [<c01427e0>] ? kthread+0x0/0x80 [<c010483b>] kernel_thread_helper+0x7/0x10 ---[ end trace efe0b44f65c8c65d ]---
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