This problem is present on my Dapper system:
[EMAIL PROTECTED]:~$ uname -r
2.6.15-28-amd64-generic
[EMAIL PROTECTED]:~$ grep -A14 "hw csum failure" /var/log/kern.log
Mar 13 02:08:48 despair kernel: [ 3077.021924] eth0: hw csum failure.
Mar 13 02:08:48 despair kernel: [ 3077.021932]
Mar 13 02:08:48 despair kernel: [ 3077.021933] Call Trace: <IRQ>
<ffffffff802a1cdd>{__skb_checksum_complete+77}
Mar 13 02:08:48 despair kernel: [ 3077.021964]
<ffffffff802e4eaf>{tcp_v4_rcv+415} <ffffffff8016861e>{__do_IRQ+254}
Mar 13 02:08:48 despair kernel: [ 3077.021985]
<ffffffff802c56cd>{ip_route_input+61} <ffffffff802c7f25>{ip_local_deliver+405}
Mar 13 02:08:48 despair kernel: [ 3077.022026]
<ffffffff802c8560>{ip_rcv+1312} <ffffffff802a706a>{netif_receive_skb+682}
Mar 13 02:08:48 despair kernel: [ 3077.022077]
<ffffffff8874bdfd>{:sky2:sky2_poll+2205} <ffffffff802a5797>{net_rx_action+199}
Mar 13 02:08:48 despair kernel: [ 3077.022170]
<ffffffff80143964>{__do_softirq+100} <ffffffff80111277>{call_softirq+31}
Mar 13 02:08:48 despair kernel: [ 3077.022229]
<ffffffff80112c7c>{do_softirq+44} <ffffffff801435d8>{irq_exit+72}
Mar 13 02:08:48 despair kernel: [ 3077.022245]
<ffffffff80113044>{do_IRQ+52} <ffffffff80110468>{ret_from_intr+0}
Mar 13 02:08:48 despair kernel: [ 3077.022259] <EOI>
<ffffffff80213d47>{copy_user_generic+55} <ffffffff802d5079>{tcp_sendmsg+1753}
Mar 13 02:08:48 despair kernel: [ 3077.022351]
<ffffffff8029c0a5>{sock_aio_write+325} <ffffffff8017d320>{do_wp_page+1056}
Mar 13 02:08:48 despair kernel: [ 3077.022417]
<ffffffff801901fd>{do_sync_write+205} <ffffffff801a5910>{__pollwait+0}
Mar 13 02:08:48 despair kernel: [ 3077.022558]
<ffffffff801557c0>{autoremove_wake_function+0}
<ffffffff801a666d>{sys_select+941}
Mar 13 02:08:48 despair kernel: [ 3077.022598]
<ffffffff80190754>{vfs_write+244} <ffffffff80191203>{sys_write+83}
--
Mar 13 02:30:08 despair kernel: [ 4356.925262] eth0: hw csum failure.
Mar 13 02:30:08 despair kernel: [ 4356.925270]
Mar 13 02:30:08 despair kernel: [ 4356.925271] Call Trace: <IRQ>
<ffffffff802a1cdd>{__skb_checksum_complete+77}
Mar 13 02:30:08 despair kernel: [ 4356.925299]
<ffffffff802e4eaf>{tcp_v4_rcv+415} <ffffffff802c56cd>{ip_route_input+61}
Mar 13 02:30:08 despair kernel: [ 4356.925328]
<ffffffff802c7f25>{ip_local_deliver+405} <ffffffff802c8560>{ip_rcv+1312}
Mar 13 02:30:08 despair kernel: [ 4356.925376]
<ffffffff802a706a>{netif_receive_skb+682}
<ffffffff8874bdfd>{:sky2:sky2_poll+2205}
Mar 13 02:30:08 despair kernel: [ 4356.925446]
<ffffffff8014843d>{__mod_timer+189} <ffffffff802a5797>{net_rx_action+199}
Mar 13 02:30:08 despair kernel: [ 4356.925500]
<ffffffff80148983>{run_timer_softirq+499} <ffffffff80143964>{__do_softirq+100}
Mar 13 02:30:08 despair kernel: [ 4356.925535]
<ffffffff80111277>{call_softirq+31} <ffffffff80112c7c>{do_softirq+44}
Mar 13 02:30:08 despair kernel: [ 4356.925563]
<ffffffff801435d8>{irq_exit+72} <ffffffff80113044>{do_IRQ+52}
Mar 13 02:30:08 despair kernel: [ 4356.925578]
<ffffffff80110468>{ret_from_intr+0} <EOI> <ffffffff80315c60>{thread_return+0}
Mar 13 02:30:08 despair kernel: [ 4356.925593]
<ffffffff80315cb2>{thread_return+82} <ffffffff8010e888>{mwait_idle+56}
Mar 13 02:30:08 despair kernel: [ 4356.925648]
<ffffffff8010e806>{cpu_idle+150} <ffffffff8046189b>{start_kernel+491}
Mar 13 02:30:08 despair kernel: [ 4356.925674]
<ffffffff80461286>{_sinittext+646}
Mar 13 18:46:14 despair kernel: [62900.696594] avidemux[13836] trap invalid
operand rip:2aaaaec072b0 rsp:7fffffdc51f8 error:0
--
Mar 15 20:22:40 despair kernel: [241419.608634] <unknown>: hw csum failure.
Mar 15 20:22:40 despair kernel: [241419.608640]
Mar 15 20:22:40 despair kernel: [241419.608641] Call Trace: <IRQ>
<ffffffff802a1cdd>{__skb_checksum_complete+77}
Mar 15 20:22:40 despair kernel: [241419.608673]
<ffffffff802dc678>{tcp_rcv_established+1400}
<ffffffff802e3e9f>{tcp_v4_do_rcv+63}
Mar 15 20:22:40 despair kernel: [241419.608722]
<ffffffff80134d83>{__wake_up+67} <ffffffff802e576d>{tcp_v4_rcv+2653}
Mar 15 20:22:40 despair kernel: [241419.608771]
<ffffffff802c7f25>{ip_local_deliver+405} <ffffffff802c8560>{ip_rcv+1312}
Mar 15 20:22:40 despair kernel: [241419.608844]
<ffffffff802a706a>{netif_receive_skb+682}
<ffffffff8874bdfd>{:sky2:sky2_poll+2205}
Mar 15 20:22:40 despair kernel: [241419.608916]
<ffffffff802a5797>{net_rx_action+199}
<ffffffff80151931>{__rcu_process_callbacks+161}
Mar 15 20:22:40 despair kernel: [241419.608987]
<ffffffff80143964>{__do_softirq+100} <ffffffff80111277>{call_softirq+31}
Mar 15 20:22:40 despair kernel: [241419.609045]
<ffffffff80112c7c>{do_softirq+44} <ffffffff801435d8>{irq_exit+72}
Mar 15 20:22:40 despair kernel: [241419.609061]
<ffffffff80113044>{do_IRQ+52} <ffffffff80110468>{ret_from_intr+0}
Mar 15 20:22:40 despair kernel: [241419.609077] <EOI>
<ffffffff80315c60>{thread_return+0} <ffffffff80315cb2>{thread_return+82}
Mar 15 20:22:40 despair kernel: [241419.609095]
<ffffffff8031625d>{preempt_schedule_irq+93} <ffffffff8010e888>{mwait_idle+56}
Mar 15 20:22:40 despair kernel: [241419.609151]
<ffffffff8010e806>{cpu_idle+150} <ffffffff8046189b>{start_kernel+491}
Mar 15 20:22:40 despair kernel: [241419.609183]
<ffffffff80461286>{_sinittext+646}
Mar 15 20:47:20 despair kernel: [242899.609063] <unknown>: hw csum failure.
Mar 15 20:47:20 despair kernel: [242899.609069]
Mar 15 20:47:20 despair kernel: [242899.609070] Call Trace: <IRQ>
<ffffffff802a1cdd>{__skb_checksum_complete+77}
Mar 15 20:47:20 despair kernel: [242899.609103]
<ffffffff802dc678>{tcp_rcv_established+1400}
<ffffffff802e3e9f>{tcp_v4_do_rcv+63}
Mar 15 20:47:20 despair kernel: [242899.609152]
<ffffffff80134d83>{__wake_up+67} <ffffffff802e576d>{tcp_v4_rcv+2653}
Mar 15 20:47:20 despair kernel: [242899.609201]
<ffffffff802c7f25>{ip_local_deliver+405} <ffffffff802c8560>{ip_rcv+1312}
Mar 15 20:47:20 despair kernel: [242899.609276]
<ffffffff802a706a>{netif_receive_skb+682}
<ffffffff8874bdfd>{:sky2:sky2_poll+2205}
Mar 15 20:47:20 despair kernel: [242899.609349]
<ffffffff802a5797>{net_rx_action+199} <ffffffff80114f87>{timer_interrupt+1047}
Mar 15 20:47:20 despair kernel: [242899.609421]
<ffffffff80143964>{__do_softirq+100} <ffffffff80111277>{call_softirq+31}
Mar 15 20:47:20 despair kernel: [242899.609488]
<ffffffff80112c7c>{do_softirq+44} <ffffffff801435d8>{irq_exit+72}
Mar 15 20:47:20 despair kernel: [242899.609504]
<ffffffff80113044>{do_IRQ+52} <ffffffff80110468>{ret_from_intr+0}
Mar 15 20:47:20 despair kernel: [242899.609519] <EOI>
<ffffffff80315c60>{thread_return+0} <ffffffff80315cb2>{thread_return+82}
Mar 15 20:47:20 despair kernel: [242899.609537]
<ffffffff80110596>{retint_kernel+38} <ffffffff8010e888>{mwait_idle+56}
Mar 15 20:47:20 despair kernel: [242899.609593]
<ffffffff8010e806>{cpu_idle+150} <ffffffff8046189b>{start_kernel+491}
Mar 15 20:47:20 despair kernel: [242899.609624]
<ffffffff80461286>{_sinittext+646}
--
[feisty] sky2 - hw csum failure with 2.6.20-9-generic x86_64
https://launchpad.net/bugs/88700
--
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