I got same error too:
Nov 15 23:04:05 !!! kernel: [433562.050053] ------------[ cut here ]------------
Nov 15 23:04:05 !!! kernel: [433562.050070] WARNING: at 
/build/buildd/linux-2.6.31/net/sched/sch_generic.c:246 
dev_watchdog+0x262/0x270()
Nov 15 23:04:05 !!! kernel: [433562.050073] Hardware name: PowerEdge 1950
Nov 15 23:04:05 !!! kernel: [433562.050075] NETDEV WATCHDOG: eth0 (bnx2): 
transmit queue 0 timed out
Nov 15 23:04:05 !!! kernel: [433562.050082] Modules linked in: mii usbhid 
iptable_raw ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs 
reiserfs sch_prio act_police cls_u32 sch_ingress sch_tbf pptp pppoe pppox 
bonding xt_recent xt_state xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 
nf_conntrack nf_defrag_ipv4 iptable_mangle radeon ttm drm bnx2 i5000_edac 
iptable_filter edac_core dell_wmi psmouse i2c_algo_bit ip_tables lp i5k_amb 
serio_raw dcdbas shpchp x_tables parport mptsas mptscsih mptbase 
scsi_transport_sas e1000e [last unloaded: sky2]
Nov 15 23:04:05 !!! kernel: [433562.050146] Pid: 0, comm: swapper Not tainted 
2.6.31-14-server #48-Ubuntu
Nov 15 23:04:05 !!! kernel: [433562.050148] Call Trace:
Nov 15 23:04:05 !!! kernel: [433562.050150]  <IRQ>  [<ffffffff8105e618>] 
warn_slowpath_common+0x78/0xb0
Nov 15 23:04:05 !!! kernel: [433562.050164]  [<ffffffff8105e6ac>] 
warn_slowpath_fmt+0x3c/0x40
Nov 15 23:04:05 !!! kernel: [433562.050166]  [<ffffffff8144db42>] 
dev_watchdog+0x262/0x270
Nov 15 23:04:05 !!! kernel: [433562.050177]  [<ffffffffa02013e6>] ? 
destroy_conntrack+0xb6/0xf0 [nf_conntrack]
Nov 15 23:04:05 !!! kernel: [433562.050181]  [<ffffffff81459d92>] ? 
nf_conntrack_destroy+0x12/0x20
Nov 15 23:04:05 !!! kernel: [433562.050188]  [<ffffffffa0201054>] ? 
death_by_timeout+0x84/0x150 [nf_conntrack]
Nov 15 23:04:05 !!! kernel: [433562.050191]  [<ffffffff81053a03>] ? 
scheduler_tick+0x123/0x270
Nov 15 23:04:05 !!! kernel: [433562.050193]  [<ffffffff8144d8e0>] ? 
dev_watchdog+0x0/0x270
Nov 15 23:04:05 !!! kernel: [433562.050197]  [<ffffffff8106a90c>] 
run_timer_softirq+0x16c/0x270
Nov 15 23:04:05 !!! kernel: [433562.050200]  [<ffffffff810651fd>] 
__do_softirq+0xbd/0x200
Nov 15 23:04:05 !!! kernel: [433562.050203]  [<ffffffff810131ac>] 
call_softirq+0x1c/0x30
Nov 15 23:04:05 !!! kernel: [433562.050206]  [<ffffffff81014b85>] 
do_softirq+0x55/0x90
Nov 15 23:04:05 !!! kernel: [433562.050208]  [<ffffffff81064f65>] 
irq_exit+0x85/0x90
Nov 15 23:04:05 !!! kernel: [433562.050211]  [<ffffffff8102c9ac>] 
smp_apic_timer_interrupt+0x6c/0xa0
Nov 15 23:04:05 !!! kernel: [433562.050215]  [<ffffffff81012b73>] 
apic_timer_interrupt+0x13/0x20
Nov 15 23:04:05 !!! kernel: [433562.050216]  <EOI>  [<ffffffff8101a11c>] ? 
mwait_idle+0x7c/0x120
Nov 15 23:04:05 !!! kernel: [433562.050227]  [<ffffffff815298f5>] ? 
atomic_notifier_call_chain+0x15/0x20
Nov 15 23:04:05 !!! kernel: [433562.050230]  [<ffffffff81010e02>] ? 
cpu_idle+0xb2/0x100
Nov 15 23:04:05 !!! kernel: [433562.050234]  [<ffffffff815123c6>] ? 
rest_init+0x66/0x70
Nov 15 23:04:05 !!! kernel: [433562.050239]  [<ffffffff81838047>] ? 
start_kernel+0x352/0x35b
Nov 15 23:04:05 !!! kernel: [433562.050241]  [<ffffffff8183759a>] ? 
x86_64_start_reservations+0x125/0x129
Nov 15 23:04:05 !!! kernel: [433562.050243]  [<ffffffff81837698>] ? 
x86_64_start_kernel+0xfa/0x109
Nov 15 23:04:05 !!! kernel: [433562.050246] ---[ end trace ac522a1b002f7a69 ]---

-- 
 NETDEV WATCHDOG: eth0 (sis900): transmit queue 0 timed out
https://bugs.launchpad.net/bugs/483131
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