1711.681495] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 1711.689373] IP: [<ffffffff81469014>] pfifo_fast_dequeue+0x54/0xa0
[ 1711.695496] PGD 0 
[ 1711.697535] Oops: 0002 [#1] SMP 
[ 1711.700808] last sysfs file: /sys/devices/virtual/net/eth4.256/type
[ 1711.707078] CPU 0 
[ 1711.708923] Modules linked in: pktgen 8021q garp stp nls_cp437 cifs ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ixgbe iptable_filter ip_tables x_tables ioatdma lp dca mdio parport e1000e
[ 1711.729308] 
[ 1711.730806] Pid: 10970, comm: kpktgend_0 Not tainted 2.6.35 #1 Greencity/Greencity
[ 1711.738379] RIP: 0010:[<ffffffff81469014>]  [<ffffffff81469014>] pfifo_fast_dequeue+0x54/0xa0
[ 1711.746927] RSP: 0018:ffff880001e03e50  EFLAGS: 00010206
[ 1711.752242] RAX: ffff880134b0c000 RBX: ffff880233e39a00 RCX: 0000000000000001
[ 1711.759380] RDX: ffff880233e39b00 RSI: 0000000000000001 RDI: ffff880233e39a00
[ 1711.766534] RBP: ffff880001e03e50 R08: ffff880134b0c000 R09: ffff880233e39b20
[ 1711.773687] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880134e1dfd8
[ 1711.780839] R13: ffff880233e39a9c R14: 000000010002288b R15: ffff880134e1dfd8
[ 1711.787991] FS:  0000000000000000(0000) GS:ffff880001e00000(0000) knlGS:0000000000000000
[ 1711.796112] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1711.801874] CR2: 0000000000000008 CR3: 0000000001a2a000 CR4: 00000000000006f0
[ 1711.809026] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1711.816179] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1711.823331] Process kpktgend_0 (pid: 10970, threadinfo ffff880134e1c000, task ffff8801332ead60)
[ 1711.832058] Stack:
[ 1711.834089]  ffff880001e03e90 ffffffff81469fe3 ffff880001e03ec0 ffffffff814503f2
[ 1711.841391] <0> 0000000000000000 ffff880233e39a9c 0000000000016240 ffff880233e39a00
[ 1711.849181] <0> ffff880001e03ec0 ffffffff8144e6e8 0000000000000010 0000000000000001
[ 1711.857175] Call Trace:
[ 1711.859640]  <IRQ> 
[ 1711.861778]  [<ffffffff81469fe3>] __qdisc_run+0x43/0x130
[ 1711.867111]  [<ffffffff814503f2>] ? net_rx_action+0x192/0x230
[ 1711.872876]  [<ffffffff8144e6e8>] net_tx_action+0x118/0x190
[ 1711.878469]  [<ffffffff8105ea35>] __do_softirq+0xb5/0x1f0
[ 1711.883890]  [<ffffffff810b4308>] ? handle_IRQ_event+0x48/0x160
[ 1711.889828]  [<ffffffff8100addc>] call_softirq+0x1c/0x30
[ 1711.895159]  [<ffffffff8100c905>] do_softirq+0x65/0xa0
[ 1711.900315]  [<ffffffff8105e8fd>] irq_exit+0x7d/0x90
[ 1711.905298]  [<ffffffff8100be60>] do_IRQ+0x70/0xf0
[ 1711.910109]  [<ffffffff8154ea13>] ret_from_intr+0x0/0x11
[ 1711.915438]  <EOI> 
[ 1711.917577]  [<ffffffff810319a0>] ? __ticket_spin_unlock+0x0/0x10
[ 1711.923690]  [<ffffffffa00f7dca>] ? pktgen_thread_worker+0x14a/0x840 [pktgen]
[ 1711.930845]  [<ffffffff81075700>] ? autoremove_wake_function+0x0/0x40
[ 1711.937305]  [<ffffffff81075700>] ? autoremove_wake_function+0x0/0x40
[ 1711.943764]  [<ffffffffa00f7c80>] ? pktgen_thread_worker+0x0/0x840 [pktgen]
[ 1711.950743]  [<ffffffff810751ce>] kthread+0x8e/0xa0
[ 1711.955640]  [<ffffffff8100ace4>] kernel_thread_helper+0x4/0x10
[ 1711.961578]  [<ffffffff81075140>] ? kthread+0x0/0xa0
[ 1711.966561]  [<ffffffff8100ace0>] ? kernel_thread_helper+0x0/0x10
[ 1711.972671] Code: 40 08 4d 8d 48 08 49 39 c1 74 5c 48 85 c0 74 2d 41 83 68 18 01 4c 8b 40 08 4c 8b 10 48 c7 40 08 00 00 00 00 48 c7 00 00 00 00 00 <4d> 89 42 08 4d 89 10 44 8b 40 28 44 29 87 b0 00 00 00 48 8d 34 
[ 1711.992874] RIP  [<ffffffff81469014>] pfifo_fast_dequeue+0x54/0xa0
[ 1711.999094]  RSP <ffff880001e03e50>
[ 1712.002600] CR2: 0000000000000008
[ 1712.006230] ---[ end trace 3bdc909dc99f9fd5 ]---
[ 1712.010907] Kernel panic - not syncing: Fatal exception in interrupt
[ 1712.017317] Pid: 10970, comm: kpktgend_0 Tainted: G      D     2.6.35 #1
[ 1712.024077] Call Trace:
[ 1712.026579]  <IRQ>  [<ffffffff8154b7f4>] panic+0x8b/0x10c
[ 1712.032095]  [<ffffffff8154f9ca>] oops_end+0xea/0xf0
[ 1712.037118]  [<ffffffff81038693>] no_context+0xf3/0x260
[ 1712.042405]  [<ffffffffa00bda04>] ? ixgbe_xmit_frame+0xaf4/0x1060 [ixgbe]
[ 1712.049248]  [<ffffffff81038915>] __bad_area_nosemaphore+0x115/0x1d0
[ 1712.055664]  [<ffffffff81290810>] ? swiotlb_map_page+0x0/0xf0
[ 1712.061470]  [<ffffffff810389de>] bad_area_nosemaphore+0xe/0x10
[ 1712.067446]  [<ffffffff815520ef>] do_page_fault+0x26f/0x310
[ 1712.073078]  [<ffffffff8154ecf5>] page_fault+0x25/0x30
[ 1712.078274]  [<ffffffff81469014>] ? pfifo_fast_dequeue+0x54/0xa0
[ 1712.084340]  [<ffffffff81469fe3>] __qdisc_run+0x43/0x130
[ 1712.089707]  [<ffffffff814503f2>] ? net_rx_action+0x192/0x230
[ 1712.095514]  [<ffffffff8144e6e8>] net_tx_action+0x118/0x190
[ 1712.101147]  [<ffffffff8105ea35>] __do_softirq+0xb5/0x1f0
[ 1712.106602]  [<ffffffff810b4308>] ? handle_IRQ_event+0x48/0x160
[ 1712.112581]  [<ffffffff8100addc>] call_softirq+0x1c/0x30
[ 1712.117949]  [<ffffffff8100c905>] do_softirq+0x65/0xa0
[ 1712.123147]  [<ffffffff8105e8fd>] irq_exit+0x7d/0x90
[ 1712.128166]  [<ffffffff8100be60>] do_IRQ+0x70/0xf0
[ 1712.133017]  [<ffffffff8154ea13>] ret_from_intr+0x0/0x11
[ 1712.138383]  <EOI>  [<ffffffff810319a0>] ? __ticket_spin_unlock+0x0/0x10
[ 1712.145202]  [<ffffffffa00f7dca>] ? pktgen_thread_worker+0x14a/0x840 [pktgen]
[ 1712.152397]  [<ffffffff81075700>] ? autoremove_wake_function+0x0/0x40
[ 1712.158893]  [<ffffffff81075700>] ? autoremove_wake_function+0x0/0x40
[ 1712.165394]  [<ffffffffa00f7c80>] ? pktgen_thread_worker+0x0/0x840 [pktgen]
[ 1712.172413]  [<ffffffff810751ce>] kthread+0x8e/0xa0
[ 1712.177346]  [<ffffffff8100ace4>] kernel_thread_helper+0x4/0x10
[ 1712.183327]  [<ffffffff81075140>] ? kthread+0x0/0xa0
[ 1712.188346]  [<ffffffff8100ace0>] ? kernel_thread_helper+0x0/0x10