anthony@monkey:~$ iperf -c 10.0.1.1
------------------------------------------------------------
Client connecting to 10.0.1.1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.0.1.201 port 57707 connected with 10.0.1.1 port 5001
------------[ cut here ]------------
kernel BUG at drivers/virtio/virtio_ring.c:218!
invalid opcode: 0000 [1] SMP 
CPU 0 
Modules linked in:
Pid: 2541, comm: iperf Not tainted 2.6.25-rc6 #1
RIP: 0010:[<ffffffff804bbfb8>]  [<ffffffff804bbfb8>] vring_disable_cb+0xb/0x16
RSP: 0018:ffff810006def830  EFLAGS: 00010202
RAX: ffffffff80740001 RBX: ffff81000710d896 RCX: 0000000000000001
RDX: ffff8100071fc800 RSI: 0000000000000096 RDI: ffff8100071fe800
RBP: ffff810007043700 R08: ffffffff806f9100 R09: ffff810006def5d8
R10: 0000000000000046 R11: 0000000000000000 R12: ffff810007b27700
R13: ffff810007b27000 R14: ffff810007b27788 R15: 0000000000000002
FS:  0000000040dba950(0063) GS:ffffffff80759000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000516000 CR3: 00000000079dd000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process iperf (pid: 2541, threadinfo ffff810006dee000, task ffff8100073b0040)
Stack:  ffffffff803fdef0 ffffe20000188eaa 0000000a00000738 0000000000000000
 0000000000000000 ffffe2000018bada 000005ea00000896 0000000000000000
 0000000000000000 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff803fdef0>] ? start_xmit+0x21a/0x271
 [<ffffffff804cd854>] ? dev_hard_start_xmit+0x1d6/0x25a
 [<ffffffff804db36e>] ? __qdisc_run+0x97/0x190
 [<ffffffff804cfbf4>] ? dev_queue_xmit+0x147/0x26f
 [<ffffffff804e768e>] ? ip_queue_xmit+0x2c1/0x314
 [<ffffffff80279ab8>] ? cache_alloc_refill+0xcf/0x22f
 [<ffffffff804f6794>] ? tcp_transmit_skb+0x6ca/0x6f9
 [<ffffffff804f8772>] ? tcp_push_one+0xa4/0xcc
 [<ffffffff804edd23>] ? tcp_sendmsg+0x821/0xa82
 [<ffffffff804c24a8>] ? sock_aio_write+0xd5/0xe0
 [<ffffffff8027e64c>] ? do_sync_write+0xd1/0x118
 [<ffffffff8025ce65>] ? __alloc_pages+0xaf/0x33e
 [<ffffffff804c2758>] ? sockfd_lookup_light+0x1a/0x52
 [<ffffffff8023f381>] ? autoremove_wake_function+0x0/0x2e
 [<ffffffff802668da>] ? handle_mm_fault+0x2d3/0x6c0
 [<ffffffff8027edb0>] ? vfs_write+0xc0/0x136
 [<ffffffff8027f2d2>] ? sys_write+0x45/0x6e
 [<ffffffff8020b06b>] ? system_call_after_swapgs+0x7b/0x80


Code: c7 47 4c 00 00 00 00 0f ae f0 48 8b 47 38 f6 00 01 75 07 4c 8b 59 58 41 ff e3 c3 e9 59 e5 db ff 48 8b 57 30 66 8b 02 a8 01 74 04 <0f> 0b eb fe 83 c8 01 66 89 02 c3 41 57 49 89 cf 41 56 4d 89 c6 
RIP  [<ffffffff804bbfb8>] vring_disable_cb+0xb/0x16
 RSP <ffff810006def830>
---[ end trace 7b73257db545246e ]---
Kernel panic - not syncing: Aiee, killing interrupt handler!