I see the same on one of my two Debian 6 Linodes at boot. (The other, configured almost exactly the same, doesn't show it.)
There doesn't seem to be any ill effects -- the affected Linode runs fine.
Code:
Dec 23 10:13:53 mars kernel: ------------[ cut here ]------------
Dec 23 10:13:53 mars kernel: WARNING: at net/core/skbuff.c:3448 skb_try_coalesce+0x2cf/0x300()
Dec 23 10:13:53 mars kernel: Modules linked in:
Dec 23 10:13:53 mars kernel: Pid: 0, comm: swapper/0 Not tainted 3.6.5-linode47 #1
Dec 23 10:13:53 mars kernel: Call Trace:
Dec 23 10:13:53 mars kernel: [<c0130fd8>] ? warn_slowpath_common+0x78/0xb0
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c013102b>] ? warn_slowpath_null+0x1b/0x20
Dec 23 10:13:53 mars kernel: [<c05c0faf>] ? skb_try_coalesce+0x2cf/0x300
Dec 23 10:13:53 mars kernel: [<c066df0c>] ? tcp_queue_rcv+0xdc/0x130
Dec 23 10:13:53 mars kernel: [<c06716f2>] ? tcp_rcv_established+0x222/0x5c0
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c06788e1>] ? tcp_v4_do_rcv+0xf1/0x1e0
Dec 23 10:13:53 mars kernel: [<c06790d5>] ? tcp_v4_rcv+0x705/0x7f0
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c0659bd8>] ? ip_local_deliver_finish+0x98/0x220
Dec 23 10:13:53 mars kernel: [<c0659b40>] ? ip_rcv+0x330/0x330
Dec 23 10:13:53 mars kernel: [<c06595eb>] ? ip_rcv_finish+0xeb/0x310
Dec 23 10:13:53 mars kernel: [<c0659500>] ? inet_del_protocol+0x30/0x30
Dec 23 10:13:53 mars kernel: [<c05c86fa>] ? __netif_receive_skb+0x41a/0x590
Dec 23 10:13:53 mars kernel: [<c05ca0bf>] ? netif_receive_skb+0x1f/0x70
Dec 23 10:13:53 mars kernel: [<c0561149>] ? handle_incoming_queue+0x179/0x260
Dec 23 10:13:53 mars kernel: [<c0561454>] ? xennet_poll+0x224/0x540
Dec 23 10:13:53 mars kernel: [<c0190000>] ? prctl_set_seccomp+0x70/0x80
Dec 23 10:13:53 mars kernel: [<c05caa0a>] ? net_rx_action+0xea/0x1a0
Dec 23 10:13:53 mars kernel: [<c0138720>] ? __do_softirq+0x90/0x140
Dec 23 10:13:53 mars kernel: [<c0138690>] ? irq_enter+0x70/0x70
Dec 23 10:13:53 mars kernel: <IRQ> [<c01384e6>] ? irq_exit+0x66/0x90
Dec 23 10:13:53 mars kernel: [<c04e8a1d>] ? xen_evtchn_do_upcall+0x1d/0x30
Dec 23 10:13:53 mars kernel: [<c076d887>] ? xen_do_upcall+0x7/0xc
Dec 23 10:13:53 mars kernel: [<c01013a7>] ? hypercall_page+0x3a7/0x1000
Dec 23 10:13:53 mars kernel: [<c010627f>] ? xen_safe_halt+0xf/0x20
Dec 23 10:13:53 mars kernel: [<c01102ec>] ? default_idle+0x1c/0x40
Dec 23 10:13:53 mars kernel: [<c011050a>] ? cpu_idle+0x4a/0x80
Dec 23 10:13:53 mars kernel: [<c0932a9c>] ? start_kernel+0x2e5/0x2ea
Dec 23 10:13:53 mars kernel: [<c0932632>] ? kernel_init+0x127/0x127
Dec 23 10:13:53 mars kernel: [<c0935a71>] ? xen_start_kernel+0x550/0x558
Dec 23 10:13:53 mars kernel: ---[ end trace 9b4cca322e7633d9 ]---
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