Apr 23 00:57:32 xen02 kernel: [655851.666195] vif vif-3-0: vif3.0: Frag is bigger than frame.
Apr 23 00:57:32 xen02 kernel: [655851.666218] vif vif-3-0: vif3.0: fatal error; disabling device
Apr 23 00:57:32 xen02 kernel: [655851.666255] BUG: unable to handle kernel NULL pointer dereference at 00000000000008b8
Apr 23 00:57:32 xen02 kernel: [655851.666285] IP: [<ffffffff810121d1>] xen_spin_lock_flags+0x21/0x50
Apr 23 00:57:32 xen02 kernel: [655851.666315] PGD 51182067 PUD 5279c067 PMD 0
Apr 23 00:57:32 xen02 kernel: [655851.666343] Oops: 0002 [#1] SMP
Apr 23 00:57:32 xen02 kernel: [655851.666365] CPU 0
Apr 23 00:57:32 xen02 kernel: [655851.666374] Modules linked in: xt_physdev iptable_filter ip_tables x_tables drbd lru_cache dm_crypt aesni_intel cryptd aes_x86_64 xenfs xen_wdt xen_gntalloc xen_gntdev xen_evtchn xen_pciback xen_blkback xen_netback bridge stp ipmi_watchdog ipmi_si ipmi_poweroff ipmi_devintf ioatdma dca psmouse i7core_edac edac_core ipmi_msghandler joydev serio_raw dm_multipath mac_hid lp parport nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc usbhid hid 3w_9xxx e1000e
Apr 23 00:57:32 xen02 kernel: [655851.666676]
Apr 23 00:57:32 xen02 kernel: [655851.666686] Pid: 1374, comm: netback/0 Not tainted 3.2.0-39-generic #62-Ubuntu Supermicro X8DT6/X8DT6
Apr 23 00:57:32 xen02 kernel: [655851.666724] RIP: e030:[<ffffffff810121d1>]  [<ffffffff810121d1>] xen_spin_lock_flags+0x21/0x50
Apr 23 00:57:32 xen02 kernel: [655851.666753] RSP: e02b:ffff880053637c50  EFLAGS: 00010086
Apr 23 00:57:32 xen02 kernel: [655851.666785] RAX: 0000000000000400 RBX: 00000000000008b8 RCX: 000000000aa6dadf
Apr 23 00:57:32 xen02 kernel: [655851.666836] RDX: 0000000000000001 RSI: 0000000000000211 RDI: 00000000000008b8
Apr 23 00:57:32 xen02 kernel: [655851.666887] RBP: ffff880053637c60 R08: ffffc90013f36a9c R09: ffff880062000a90
Apr 23 00:57:32 xen02 kernel: [655851.666937] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
Apr 23 00:57:32 xen02 kernel: [655851.666988] R13: ffff88000323e780 R14: ffff88000323e858 R15: 0000000000000000
Apr 23 00:57:32 xen02 kernel: [655851.667043] FS:  00007f40e820d700(0000) GS:ffff88007d000000(0000) knlGS:0000000000000000
Apr 23 00:57:32 xen02 kernel: [655851.667096] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
Apr 23 00:57:32 xen02 kernel: [655851.667129] CR2: 00000000000008b8 CR3: 000000004865c000 CR4: 0000000000002660
Apr 23 00:57:32 xen02 kernel: [655851.667180] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Apr 23 00:57:32 xen02 kernel: [655851.667231] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Apr 23 00:57:32 xen02 kernel: [655851.667282] Process netback/0 (pid: 1374, threadinfo ffff880053636000, task ffff8800514a2e00)
Apr 23 00:57:32 xen02 kernel: [655851.667338] Stack:
Apr 23 00:57:32 xen02 kernel: [655851.667363]  0000000000000211 00000000000008b8 ffff880053637c80 ffffffff8165dc0e
Apr 23 00:57:32 xen02 kernel: [655851.667433]  0000000000000000 00000000000008b8 ffff880053637cc0 ffffffffa0242dff
Apr 23 00:57:32 xen02 kernel: [655851.668640]  ffff880053637ca0 ffffffff8155296e 000000000aa6dadf ffff88000323e780
Apr 23 00:57:32 xen02 kernel: [655851.668710] Call Trace:
Apr 23 00:57:32 xen02 kernel: [655851.668741]  [<ffffffff8165dc0e>] _raw_spin_lock_irqsave+0x2e/0x40
Apr 23 00:57:32 xen02 kernel: [655851.668779]  [<ffffffffa0242dff>] xen_netbk_schedule_xenvif+0x8f/0x100 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.668835]  [<ffffffff8155296e>] ? rtnl_unlock+0xe/0x10
Apr 23 00:57:32 xen02 kernel: [655851.668870]  [<ffffffffa0242f2a>] xen_netbk_check_rx_xenvif+0x2a/0x60 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.668925]  [<ffffffffa0243015>] netbk_tx_err+0x65/0x80 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.668962]  [<ffffffffa02435dd>] xen_netbk_tx_build_gops+0x5ad/0x610 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.669016]  [<ffffffff810136ef>] ? __switch_to+0xff/0x360
Apr 23 00:57:32 xen02 kernel: [655851.669050]  [<ffffffff8165d97e>] ? _raw_spin_lock+0xe/0x20
Apr 23 00:57:32 xen02 kernel: [655851.669085]  [<ffffffff81057153>] ? finish_task_switch+0x53/0xf0
Apr 23 00:57:32 xen02 kernel: [655851.669121]  [<ffffffff8165b41c>] ? __schedule+0x3cc/0x6f0
Apr 23 00:57:32 xen02 kernel: [655851.669157]  [<ffffffffa02436dc>] xen_netbk_kthread+0x9c/0x1d0 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.669196]  [<ffffffff8108beb0>] ? add_wait_queue+0x60/0x60
Apr 23 00:57:32 xen02 kernel: [655851.669231]  [<ffffffffa0243640>] ? xen_netbk_tx_build_gops+0x610/0x610 [xen_netback]
Apr 23 00:57:32 xen02 kernel: [655851.669285]  [<ffffffff8108b40c>] kthread+0x8c/0xa0
Apr 23 00:57:32 xen02 kernel: [655851.669320]  [<ffffffff816680f4>] kernel_thread_helper+0x4/0x10
Apr 23 00:57:32 xen02 kernel: [655851.669355]  [<ffffffff816661a3>] ? int_ret_from_sys_call+0x7/0x1b
Apr 23 00:57:32 xen02 kernel: [655851.669390]  [<ffffffff8165de7c>] ? retint_restore_args+0x5/0x6
Apr 23 00:57:32 xen02 kernel: [655851.669425]  [<ffffffff816680f0>] ? gs_change+0x13/0x13
Apr 23 00:57:32 xen02 kernel: [655851.669456] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 83 ec 10 48 89 5d f0 4c 89 65 f8 48 89 fb 41 bc 01 00 00 00 b8 00 04 00 00 44 89 e2 <86> 13 84 d2 74 0b f3 90 80 3b 00 74 f3 ff c8 75 f5 84 d2 75 0a
Apr 23 00:57:32 xen02 kernel: [655851.669830] RIP  [<ffffffff810121d1>] xen_spin_lock_flags+0x21/0x50
Apr 23 00:57:32 xen02 kernel: [655851.669869]  RSP <ffff880053637c50>
Apr 23 00:57:32 xen02 kernel: [655851.669897] CR2: 00000000000008b8
Apr 23 00:57:32 xen02 kernel: [655851.670178] ---[ end trace ddcea802cb15c754 ]---
Apr 23 00:57:32 xen02 kernel: [655851.671759] br1: port 2(vif3.0) entering forwarding state