Getting messages like that sometimes. Is it related to this bug ?

Sep 19 08:12:13 jubjub kernel: [69946.363558] WARNING: at /build/buildd/linux-2.6.32/net/ipv4/tcp_input.c:2540 tcp_mark_head_lost+0x214/0x230()
Sep 19 08:12:13 jubjub kernel: [69946.363562] Hardware name: To Be Filled By O.E.M.
Sep 19 08:12:13 jubjub kernel: [69946.363565] Modules linked in: iptable_filter ip_tables x_tables fbcon tileblit font bitblit softcursor vga16fb vgastate aufs i915 w83627ehf hwmon_vid coretemp drm_kms_helper intel_agp drm i2c_algo_bit video output lp parport usb_storage r8169 mii
Sep 19 08:12:13 jubjub kernel: [69946.363602] Pid: 0, comm: swapper Tainted: G        W  2.6.32-24-generic #43-Ubuntu
Sep 19 08:12:13 jubjub kernel: [69946.363606] Call Trace:
Sep 19 08:12:13 jubjub kernel: [69946.363609]  <IRQ>  [<ffffffff81066ddb>] warn_slowpath_common+0x7b/0xc0
Sep 19 08:12:13 jubjub kernel: [69946.363622]  [<ffffffff81066e34>] warn_slowpath_null+0x14/0x20
Sep 19 08:12:13 jubjub kernel: [69946.363628]  [<ffffffff814a0ad4>] tcp_mark_head_lost+0x214/0x230
Sep 19 08:12:13 jubjub kernel: [69946.363634]  [<ffffffff814a0c3a>] tcp_update_scoreboard+0x14a/0x200
Sep 19 08:12:13 jubjub kernel: [69946.363640]  [<ffffffff814a5fd3>] tcp_fastretrans_alert+0x383/0xd90
Sep 19 08:12:13 jubjub kernel: [69946.363646]  [<ffffffff814a7474>] tcp_ack+0x284/0x6b0
Sep 19 08:12:13 jubjub kernel: [69946.363652]  [<ffffffff814a8373>] tcp_rcv_established+0x573/0x730
Sep 19 08:12:13 jubjub kernel: [69946.363658]  [<ffffffff814afca3>] tcp_v4_do_rcv+0xf3/0x160
Sep 19 08:12:13 jubjub kernel: [69946.363663]  [<ffffffff814b13f5>] tcp_v4_rcv+0x5b5/0x7e0
Sep 19 08:12:13 jubjub kernel: [69946.363668]  [<ffffffff8148f2f0>] ? ip_local_deliver_finish+0x0/0x2d0
Sep 19 08:12:13 jubjub kernel: [69946.363675]  [<ffffffff81486d94>] ? nf_hook_slow+0x74/0x100
Sep 19 08:12:13 jubjub kernel: [69946.363680]  [<ffffffff8148f2f0>] ? ip_local_deliver_finish+0x0/0x2d0
Sep 19 08:12:13 jubjub kernel: [69946.363685]  [<ffffffff8148f3cd>] ip_local_deliver_finish+0xdd/0x2d0
Sep 19 08:12:13 jubjub kernel: [69946.363690]  [<ffffffff8148f650>] ip_local_deliver+0x90/0xa0
Sep 19 08:12:13 jubjub kernel: [69946.363695]  [<ffffffff8148eb0d>] ip_rcv_finish+0x12d/0x440
Sep 19 08:12:13 jubjub kernel: [69946.363700]  [<ffffffff8148f095>] ip_rcv+0x275/0x360
Sep 19 08:12:13 jubjub kernel: [69946.363707]  [<ffffffff8145f72a>] netif_receive_skb+0x38a/0x5d0
Sep 19 08:12:13 jubjub kernel: [69946.363718]  [<ffffffffa000b40f>] rtl8169_rx_interrupt+0x8f/0x5b0 [r8169]
Sep 19 08:12:13 jubjub kernel: [69946.363726]  [<ffffffffa000baad>] rtl8169_poll+0x3d/0x270 [r8169]
Sep 19 08:12:13 jubjub kernel: [69946.363733]  [<ffffffff810397a9>] ? default_spin_lock_flags+0x9/0x10
Sep 19 08:12:13 jubjub kernel: [69946.363739]  [<ffffffff8146021f>] net_rx_action+0x10f/0x250
Sep 19 08:12:13 jubjub kernel: [69946.363746]  [<ffffffffa000954e>] ? rtl8169_interrupt+0xde/0x1e0 [r8169]
Sep 19 08:12:13 jubjub kernel: [69946.363753]  [<ffffffff8106e487>] __do_softirq+0xb7/0x1e0
Sep 19 08:12:13 jubjub kernel: [69946.363759]  [<ffffffff810c5330>] ? handle_IRQ_event+0x60/0x170
Sep 19 08:12:13 jubjub kernel: [69946.363765]  [<ffffffff810142ec>] call_softirq+0x1c/0x30
Sep 19 08:12:13 jubjub kernel: [69946.363770]  [<ffffffff81015cb5>] do_softirq+0x65/0xa0
Sep 19 08:12:13 jubjub kernel: [69946.363775]  [<ffffffff8106e325>] irq_exit+0x85/0x90
Sep 19 08:12:13 jubjub kernel: [69946.363781]  [<ffffffff815494a5>] do_IRQ+0x75/0xf0
Sep 19 08:12:13 jubjub kernel: [69946.363786]  [<ffffffff81013b13>] ret_from_intr+0x0/0x11
Sep 19 08:12:13 jubjub kernel: [69946.363789]  <EOI>  [<ffffffff8101b5a1>] ? mwait_idle+0x71/0xd0
Sep 19 08:12:13 jubjub kernel: [69946.363799]  [<ffffffff8154712a>] ? atomic_notifier_call_chain+0x1a/0x20
Sep 19 08:12:13 jubjub kernel: [69946.363805]  [<ffffffff81011e73>] ? cpu_idle+0xb3/0x110
Sep 19 08:12:13 jubjub kernel: [69946.363811]  [<ffffffff8153e20e>] ? start_secondary+0xa8/0xaa
Sep 19 08:12:13 jubjub kernel: [69946.363816] ---[ end trace 0678bd0a81405ae0 ]---