jaunty too:

[ 3690.136809] skb_over_panic: text:ffffffffa008af75 len:3106 put:3106 head:ffff880035201000 data:ffff880035201010 tail:0xc32 end:0x680 dev:<NULL>
[ 3690.136921] ------------[ cut here ]------------
[ 3690.136930] kernel BUG at /build/buildd/linux-2.6.28/net/core/skbuff.c:128!
[ 3690.136939] invalid opcode: 0000 [#1] SMP 
[ 3690.136954] last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/charge_full
[ 3690.136964] Dumping ftrace buffer:
[ 3690.136973]    (ftrace buffer empty)
[ 3690.136980] CPU 1 
[ 3690.136990] Modules linked in: netconsole configfs nfs lockd nfs_acl sunrpc binfmt_misc bridge stp bnep powernow_k8 ppdev parport_pc lp parport joydev arc4 ecb snd_hda_intel snd_pcm snd_seq snd_timer ath5k serio_raw mac80211 snd_seq_device led_class k8temp pcspkr psmouse sdhci_pci sdhci nvidia(P) dv1394 raw1394 cfg80211 ricoh_mmc uvcvideo snd soundcore snd_page_alloc compat_ioctl32 videodev v4l1_compat btusb video output forcedeth ohci1394 ieee1394 ehci_hcd ohci_hcd fbcon tileblit font bitblit softcursor fuse
[ 3690.137272] Pid: 0, comm: swapper Tainted: P           2.6.28-4-generic #11-Ubuntu
[ 3690.137280] RIP: 0010:[<ffffffff8058d1a8>]  [<ffffffff8058d1a8>] skb_put+0x88/0x90
[ 3690.137304] RSP: 0018:ffff88007bb5fe68  EFLAGS: 00010296
[ 3690.137313] RAX: 0000000000000096 RBX: ffff88005a013100 RCX: ffff88007880a000
[ 3690.137321] RDX: ffff8800805eb000 RSI: 0000000000000086 RDI: 0000000000000296
[ 3690.137328] RBP: ffff88007bb5fe88 R08: 0000000000000000 R09: 0000000000000000
[ 3690.137335] R10: 0000000000000000 R11: ffff8800441b3800 R12: 0000000020080c22
[ 3690.137343] R13: ffff88007880a800 R14: 0000000000000c22 R15: ffff88007880a000
[ 3690.137351] FS:  00007fd9a58236f0(0000) GS:ffff88007b803a80(0000) knlGS:0000000000000000
[ 3690.137359] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 3690.137366] CR2: 00007f9cdc6ab000 CR3: 000000005dc6a000 CR4: 00000000000006a0
[ 3690.137374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3690.137381] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3690.137390] Process swapper (pid: 0, threadinfo ffff88007bb5a000, task ffff88007bb4c320)
[ 3690.137396] Stack:
[ 3690.137401]  0000000000000c32 0000000000000680 ffffffff807f2828 ffffffff8058d577
[ 3690.137423]  ffff88007bb5fec8 ffffffffa008af75 0000000100000040 0000000000000003
[ 3690.137445]  ffff88007880a800 ffff88007880a000 0000000000000000 ffffc20000054000
[ 3690.137470] Call Trace:
[ 3690.137476]  <IRQ> <0> [<ffffffff8058d577>] ? kfree_skb+0x17/0x40
[ 3690.137500]  [<ffffffffa008af75>] nv_rx_process_optimized+0xf5/0x290 [forcedeth]
[ 3690.137527]  [<ffffffffa008f7c1>] nv_nic_irq_optimized+0xb1/0x300 [forcedeth]
[ 3690.137546]  [<ffffffff8029ba95>] handle_IRQ_event+0x45/0x80
[ 3690.137562]  [<ffffffff8029d7ad>] handle_edge_irq+0xbd/0x140
[ 3690.137575]  [<ffffffff802152c0>] do_IRQ+0xc0/0x110
[ 3690.137589]  [<ffffffff80212bf3>] ret_from_intr+0x0/0x29
[ 3690.137601]  <EOI> <0> [<ffffffff8022b866>] ? native_safe_halt+0x6/0x10
[ 3690.137624]  [<ffffffff8029efa5>] ? rcu_needs_cpu+0x45/0x50
[ 3690.137638]  [<ffffffff80464dc2>] ? acpi_safe_halt+0x3a/0x55
[ 3690.137650]  [<ffffffff8046594d>] ? acpi_idle_do_entry+0x1b/0x2b
[ 3690.137661]  [<ffffffff804659c5>] ? acpi_idle_enter_c1+0x68/0x8d
[ 3690.137672]  [<ffffffff8056ea15>] ? cpuidle_idle_call+0xa5/0x100
[ 3690.137686]  [<ffffffff80210e85>] ? cpu_idle+0x65/0xc0
[ 3690.137700]  [<ffffffff806798b3>] ? start_secondary+0x9e/0xcb
[ 3690.137714] Code: 8b 57 68 48 89 44 24 10 8b 87 cc 00 00 00 48 89 44 24 08 8b bf c8 00 00 00 31 c0 48 89 3c 24 48 c7 c7 e0 a0 82 80 e8 91 f6 0e 00 <0f> 0b eb fe 0f 1f 40 00 55 48 89 e5 41 57 41 56 41 55 41 89 d5 
[ 3690.137952] RIP  [<ffffffff8058d1a8>] skb_put+0x88/0x90
[ 3690.137964]  RSP <ffff88007bb5fe68>
[ 3690.137999] Kernel panic - not syncing: Fatal exception in interrupt