Same here...

Jan 30 22:56:57 moonraker kernel: [ 3586.748458] device vif4.0 entered promiscuous mode
Jan 30 22:56:57 moonraker kernel: [ 3586.748467] audit(1201730217.790:9): dev=vif4.0 prom=256 old_prom=0 auid=4294967295
Jan 30 22:56:57 moonraker kernel: [ 3586.750219] ADDRCONF(NETDEV_UP): vif4.0: link is not ready
Jan 30 22:56:58 moonraker kernel: [ 3587.195559] ----------- [cut here ] --------- [please bite here ] ---------
Jan 30 22:56:58 moonraker kernel: [ 3587.195616] Kernel BUG at drivers/xen/core/evtchn.c:481
Jan 30 22:56:58 moonraker kernel: [ 3587.195644] invalid opcode: 0000 [1] SMP 
Jan 30 22:56:58 moonraker kernel: [ 3587.195675] CPU 1 
Jan 30 22:56:58 moonraker kernel: [ 3587.195699] Modules linked in: xt_physdev iptable_filter ip_tables x_tables dm_mirror autofs4 binfmt_misc rfcomm l2cap bluetooth af_packet bridge capability commoncap eeprom lm92 w83781d hwmon_vid i2c_isa i2c_i801 i2c_core parport_pc lp parport tsdev ide_cd cdrom pcspkr iTCO_wdt ata_generic ata_piix psmouse serio_raw shpchp pci_hotplug ipv6 evdev ext3 jbd mbcache sg sd_mod piix 3w_9xxx ahci libata scsi_mod ehci_hcd generic e1000 uhci_hcd usbcore raid1 md_mod dm_mod
Jan 30 22:56:58 moonraker kernel: [ 3587.196035] Pid: 13, comm: xenwatch Not tainted 2.6.19-4-generic-amd64 #2
Jan 30 22:56:58 moonraker kernel: [ 3587.196067] RIP: e030:[<ffffffff8038fcd7>]  [<ffffffff8038fcd7>] retrigger_vector+0x27/0x40
Jan 30 22:56:58 moonraker kernel: [ 3587.196149] RSP: e02b:ffff880001bb3d38  EFLAGS: 00010046
Jan 30 22:56:58 moonraker kernel: [ 3587.196188] RAX: 0000000000000000 RBX: 0000000000008580 RCX: ffffffffff578000
Jan 30 22:56:58 moonraker kernel: [ 3587.196223] RDX: 0000000000000019 RSI: ffff880001bb3cd0 RDI: 000000000000010b
Jan 30 22:56:58 moonraker kernel: [ 3587.196254] RBP: 000000000000010b R08: 0000000000000071 R09: 0000000000000000
Jan 30 22:56:58 moonraker kernel: [ 3587.196287] R10: ffff8800ed3a0c80 R11: ffffffff8038fcb0 R12: ffffffff80543e00
Jan 30 22:56:58 moonraker kernel: [ 3587.196319] R13: ffffffff80543e3c R14: 0000000000000000 R15: ffff880001bb3da0
Jan 30 22:56:58 moonraker kernel: [ 3587.196354] FS:  00002afb77361e30(0000) GS:ffffffff8053b080(0000) knlGS:0000000000000000
Jan 30 22:56:58 moonraker kernel: [ 3587.196402] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
Jan 30 22:56:58 moonraker kernel: [ 3587.196431] CR2: 0000000000000000 CR3: 00000000c9a5e000 CR4: 0000000000002660
Jan 30 22:56:58 moonraker kernel: [ 3587.196464] Process xenwatch (pid: 13, threadinfo ffff880001bb2000, task ffff880001bfd040)
Jan 30 22:56:58 moonraker kernel: [ 3587.196512] Stack:  ffffffff802b7090 ffff8800ca318500 ffff8800ca318500 0000000000000000
Jan 30 22:56:58 moonraker kernel: [ 3587.196572]  000000000000020c 0000000000000009 ffffffff803a0cbc 0000000000000000
Jan 30 22:56:58 moonraker kernel: [ 3587.196629]  ffffffff803a11ee ffff880001bb3e7c 0000000000000000 0000000000000000
Jan 30 22:56:58 moonraker kernel: [ 3587.196668] Call Trace:
Jan 30 22:56:58 moonraker kernel: [ 3587.196710]  [<ffffffff802b7090>] enable_irq+0xb0/0x100
Jan 30 22:56:58 moonraker kernel: [ 3587.196741]  [<ffffffff803a0cbc>] __netif_up+0xc/0x20
Jan 30 22:56:58 moonraker kernel: [ 3587.196769]  [<ffffffff803a11ee>] netif_map+0x30e/0x370
Jan 30 22:56:58 moonraker kernel: [ 3587.196801]  [<ffffffff802680c3>] thread_return+0x5d/0x11a
Jan 30 22:56:58 moonraker kernel: [ 3587.196833]  [<ffffffff803981d0>] cmp_dev+0x0/0x60
Jan 30 22:56:58 moonraker kernel: [ 3587.196862]  [<ffffffff80427f82>] klist_iter_exit+0x12/0x20
Jan 30 22:56:58 moonraker kernel: [ 3587.196893]  [<ffffffff802a2400>] keventd_create_kthread+0x0/0x80
Jan 30 22:56:58 moonraker kernel: [ 3587.196924]  [<ffffffff803a04b1>] maybe_connect+0x2a1/0x4b0
Jan 30 22:56:58 moonraker kernel: [ 3587.196956]  [<ffffffff80396630>] xenwatch_thread+0x0/0x180
Jan 30 22:56:58 moonraker kernel: [ 3587.196985]  [<ffffffff802a2400>] keventd_create_kthread+0x0/0x80
Jan 30 22:56:58 moonraker kernel: [ 3587.197016]  [<ffffffff803957e5>] xenwatch_handle_callback+0x15/0x50
Jan 30 22:56:58 moonraker kernel: [ 3587.197069]  [<ffffffff80396789>] xenwatch_thread+0x159/0x180
Jan 30 22:56:58 moonraker kernel: [ 3587.197099]  [<ffffffff802a2640>] autoremove_wake_function+0x0/0x30
Jan 30 22:56:58 moonraker kernel: [ 3587.197130]  [<ffffffff802a2400>] keventd_create_kthread+0x0/0x80
Jan 30 22:56:58 moonraker kernel: [ 3587.197161]  [<ffffffff80236749>] kthread+0xd9/0x120
Jan 30 22:56:58 moonraker kernel: [ 3587.197190]  [<ffffffff8022a814>] schedule_tail+0x44/0xc0
Jan 30 22:56:58 moonraker kernel: [ 3587.197220]  [<ffffffff80266418>] child_rip+0xa/0x12
Jan 30 22:56:58 moonraker kernel: [ 3587.197248]  [<ffffffff802a2400>] keventd_create_kthread+0x0/0x80
Jan 30 22:56:58 moonraker kernel: [ 3587.197281]  [<ffffffff80236670>] kthread+0x0/0x120
Jan 30 22:56:58 moonraker kernel: [ 3587.197309]  [<ffffffff8026640e>] child_rip+0x0/0x12
Jan 30 22:56:58 moonraker kernel: [ 3587.197337] 
Jan 30 22:56:58 moonraker kernel: [ 3587.197357] 
Jan 30 22:56:58 moonraker kernel: [ 3587.197358] Code: 0f 0b 68 11 34 46 80 c2 e1 01 f0 0f ab 91 00 08 00 00 b8 01 
Jan 30 22:56:58 moonraker kernel: [ 3587.197476] RIP  [<ffffffff8038fcd7>] retrigger_vector+0x27/0x40
Jan 30 22:56:58 moonraker kernel: [ 3587.197509]  RSP <ffff880001bb3d38>
Jan 30 23:06:37 moonraker kernel: [    0.000000] Linux version 2.6.19-4-generic-amd64 (root@king) (gcc version 4.1.2 (Ubuntu 4.1.2-0ubuntu4)) #2 SMP Sat Oct 6 01:35:53 UTC 2007