[Qemu-devel] [Bug 1558175] Re: virtio: vm killed (Guest moved used index

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[Qemu-devel] [Bug 1558175] Re: virtio: vm killed (Guest moved used index

From:	Thomas Huth
Subject:	[Qemu-devel] [Bug 1558175] Re: virtio: vm killed (Guest moved used index)
Date:	Sat, 23 Mar 2019 06:57:06 -0000
Closing this ticket since it was a bug in DPDK, and not in QEMU.

** Changed in: qemu
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1558175

Title:
  virtio: vm killed (Guest moved used index)

Status in QEMU:
  Invalid

Bug description:
  Hello,

  I ran a DPDK application with virtio ports. If I killed and relaunched it, VM 
is
  killed by qemu with the following message:
  > qemu-system-x86_64: Guest moved used index from 571 to 0

  If I ran the same application with e1000 ports, I haven't this issue.

  Network topology
  ================

  I used two VM machines with last qemu-2.5 with two virtio-net netdevs. Both
  netdevs are connected through a VDE switch.

  On testnode, I used a Debian 8 (3.16) and virtio-net linux drivers. On DUT, I
  used a Ubuntu 14.04 (3.13) with DPDK (next/16_04) with virtio pmd.

  (Topology in attachment, launchpad does not support ascii-art)

  Steps
  =====

  1. Start a DPDK application using virtio ports
  2. Send traffic over those ports (using ping flood ...)
  3. Kill this DPDK application (sending SIGKILL, making it crash etc...)
  4. Restart this DPDK application with the same configuration
  5. During EAL initialization, if an incoming packet is received on a virtio
     port, qemu exits (error code 1) with the following message:
  > qemu-system-x86_64: Guest moved used index from 571 to 0

  NOTE: This issue is *NOT* seen with e1000 interface

  Configuration
  =============

  Hypervisor
  -----------
  Debian 8
  Kernel 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u5

  Qemu
  ----

  qemu 2.5 (vanilla)
  ./configure --enable-kvm --enable-vhost-net --enable-vde 
--target-list="x86_64-softmmu" --enable-debug --extra-cflags="-O0 -g"

  > qemu-system-x86_64 -k fr --enable-kvm -m 4G -cpu host -smp \
    sockets=1,cores=1,threads=2 -serial telnet::46528,server,nowait -serial 
null \
    -qmp tcp::47257,server,nowait -monitor telnet::59305,server,nowait  -hda \
    "/opt/vm/ubuntu-14.04-template.qcow2" -snapshot -vga none -display none \
    -netdev vde,id=tapdeed01417a99,sock=L.vdesock -device \
    virtio-net,mac=DE:ED:01:0C:DD:CC,addr=04,netdev=tapdeed01417a99 -netdev \
    vde,id=tapdeed021a7b37,sock=R.vdesock -device \
    virtio-net,mac=DE:ED:02:04:01:60,addr=05,netdev=tapdeed021a7b37

  On Testnode
  -----------

  Configure interface to send continuous traffic to PMD
  > ip link set dev eth0 up
  > ip addr add 1.1.1.1/24 dev eth0
  > ip neigh add 1.1.1.2 lladdr DE:ED:01:0C:DD:CC dev eth0
  > ping -q -f 1.1.1.2

  On DUT
  ------

  Configure and start testpmd (a standard DPDK application)

  > modprobe uio
  > modprobe igb_uio
  > mkdir -p /mnt/huge
  > mount -t hugetlbfs nodev /mnt/huge
  > echo 64 > 
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
  > dpdk_nic_bind  --bind=igb_uio 0000:00:04.0
  > dpdk_nic_bind  --bind=igb_uio 0000:00:05.0
  > testpmd --huge-dir=/mnt/huge -n 4 -l 0-1 --socket-mem 128 -w 0000:00:04.0 \
    -w 0000:00:05.0 --log-level 8 -- -i --nb-cores=1 --nb-ports=2\
    --total-num-mbufs=1025
  EAL: Detected lcore 0 as core 0 on socket 0
  EAL: Detected lcore 1 as core 0 on socket 0
  EAL: Support maximum 255 logical core(s) by configuration.
  EAL: Detected 2 lcore(s)
  EAL: Probing VFIO support...
  EAL: Module /sys/module/vfio_pci not found! error 2 (No such file or 
directory)
  EAL: VFIO modules not loaded, skipping VFIO support...
  EAL: Setting up physically contiguous memory...
  EAL: Ask a virtual area of 0x4600000 bytes
  EAL: Virtual area found at 0x7fbcbf000000 (size = 0x4600000)
  EAL: Ask a virtual area of 0xc00000 bytes
  EAL: Virtual area found at 0x7fbcbe200000 (size = 0xc00000)
  EAL: Ask a virtual area of 0x400000 bytes
  EAL: Virtual area found at 0x7fbcbdc00000 (size = 0x400000)
  EAL: Ask a virtual area of 0x200000 bytes
  EAL: Virtual area found at 0x7fbcbd800000 (size = 0x200000)
  EAL: Ask a virtual area of 0x200000 bytes
  EAL: Virtual area found at 0x7fbcbd400000 (size = 0x200000)
  EAL: Ask a virtual area of 0x1c00000 bytes
  EAL: Virtual area found at 0x7fbcbb600000 (size = 0x1c00000)
  EAL: Ask a virtual area of 0x600000 bytes
  EAL: Virtual area found at 0x7fbcbae00000 (size = 0x600000)
  EAL: Ask a virtual area of 0x200000 bytes
  EAL: Virtual area found at 0x7fbcbaa00000 (size = 0x200000)
  EAL: Ask a virtual area of 0x200000 bytes
  EAL: Virtual area found at 0x7fbcba600000 (size = 0x200000)
  EAL: Requesting 64 pages of size 2MB from socket 0
  EAL: TSC frequency is ~3192572 KHz
  EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using unreliable 
clock cycles !
  EAL: Master lcore 0 is ready (tid=c5707900;cpuset=[0])
  EAL: lcore 1 is ready (tid=c3ffd700;cpuset=[1])
  EAL: PCI device 0000:00:04.0 on NUMA socket -1
  EAL:   probe driver: 1af4:1000 rte_virtio_pmd
  EAL:   PCI memory mapped at 0x7fbcc3600000
  PMD: virtio_read_caps(): [40] skipping non VNDR cap id: 11
  PMD: virtio_read_caps(): no modern virtio pci device found.
  PMD: vtpci_init(): trying with legacy virtio pci.
  PMD: virtio_resource_init_by_uio(): PCI Port IO found start=0xc020 with 
size=0x20
  PMD: virtio_negotiate_features(): guest_features before negotiate = 100cf8020
  PMD: virtio_negotiate_features(): host_features before negotiate = 79bf8064
  PMD: virtio_negotiate_features(): features after negotiate = 8f8020
  PMD: eth_virtio_dev_init(): PORT MAC: DE:ED:01:0C:DD:CC
  PMD: eth_virtio_dev_init(): VIRTIO_NET_F_MQ is not supported
  PMD: virtio_dev_cq_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 2
  PMD: virtio_dev_queue_setup(): vq_size: 64 nb_desc:0
  PMD: virtio_dev_queue_setup(): vring_size: 4612, rounded_vring_size: 8192
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134f35000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbaf35000
  PMD: eth_virtio_dev_init(): config->max_virtqueue_pairs=1
  PMD: eth_virtio_dev_init(): config->status=1
  PMD: eth_virtio_dev_init(): PORT MAC: DE:ED:01:0C:DD:CC
  PMD: eth_virtio_dev_init(): hw->max_rx_queues=1   hw->max_tx_queues=1
  PMD: eth_virtio_dev_init(): port 0 vendorID=0x1af4 deviceID=0x1000
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_cq_start(): VQ: - size=64; free=64; used=0; desc_head_idx=0; 
avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  EAL: PCI device 0000:00:05.0 on NUMA socket -1
  EAL:   probe driver: 1af4:1000 rte_virtio_pmd
  EAL:   PCI memory mapped at 0x7fbcc3601000
  PMD: virtio_read_caps(): [40] skipping non VNDR cap id: 11
  PMD: virtio_read_caps(): no modern virtio pci device found.
  PMD: vtpci_init(): trying with legacy virtio pci.
  PMD: virtio_resource_init_by_uio(): PCI Port IO found start=0xc040 with 
size=0x20
  PMD: virtio_negotiate_features(): guest_features before negotiate = 100cf8020
  PMD: virtio_negotiate_features(): host_features before negotiate = 79bf8064
  PMD: virtio_negotiate_features(): features after negotiate = 8f8020
  PMD: eth_virtio_dev_init(): PORT MAC: DE:ED:02:04:01:60
  PMD: eth_virtio_dev_init(): VIRTIO_NET_F_MQ is not supported
  PMD: virtio_dev_cq_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 2
  PMD: virtio_dev_queue_setup(): vq_size: 64 nb_desc:0
  PMD: virtio_dev_queue_setup(): vring_size: 4612, rounded_vring_size: 8192
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134f30000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbaf30000
  PMD: eth_virtio_dev_init(): config->max_virtqueue_pairs=1
  PMD: eth_virtio_dev_init(): config->status=1
  PMD: eth_virtio_dev_init(): PORT MAC: DE:ED:02:04:01:60
  PMD: eth_virtio_dev_init(): hw->max_rx_queues=1   hw->max_tx_queues=1
  PMD: eth_virtio_dev_init(): port 1 vendorID=0x1af4 deviceID=0x1000
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_cq_start(): VQ: - size=64; free=64; used=0; desc_head_idx=0; 
avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  Interactive-mode selected
  Configuring Port 0 (socket 0)
  PMD: virtio_dev_configure(): configure
  PMD: virtio_dev_tx_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 1
  PMD: virtio_dev_queue_setup(): vq_size: 256 nb_desc:512
  PMD: virtio_dev_queue_setup(): vring_size: 10244, rounded_vring_size: 12288
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134eac000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbaeac000
  PMD: virtio_dev_rx_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 0
  PMD: virtio_dev_queue_setup(): vq_size: 256 nb_desc:128
  PMD: virtio_dev_queue_setup(): vring_size: 10244, rounded_vring_size: 12288
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134ea6000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbaea6000
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 0 is up
  PMD: virtio_dev_rxtx_start():  >>
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_vring_start(): Allocated 256 bufs
  PMD: virtio_dev_rxtx_start(): VQ: - size=256; free=0; used=0; 
desc_head_idx=32768; avail.idx=256; used_cons_idx=0; used.idx=0; 
avail.flags=0x1; used.flags=0x0
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_rxtx_start(): VQ: - size=256; free=256; used=0; 
desc_head_idx=0; avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; 
used.flags=0x0
  PMD: virtio_dev_start(): nb_queues=1
  PMD: virtio_dev_start(): Notified backend at initialization
  PMD: virtio_dev_start(): VQ: - size=256; free=0; used=0; desc_head_idx=32768; 
avail.idx=256; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  PMD: virtio_dev_start(): VQ: - size=256; free=256; used=0; desc_head_idx=0; 
avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  rte_eth_dev_config_restore: port 0: MAC address array not supported
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf37880 vq = 0x7fbcbaf37880
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf37880 vq = 0x7fbcbaf37880
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 0 is up
  Port 0: DE:ED:01:0C:DD:CC
  Configuring Port 1 (socket 0)
  PMD: virtio_dev_configure(): configure
  PMD: virtio_dev_tx_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 1
  PMD: virtio_dev_queue_setup(): vq_size: 256 nb_desc:512
  PMD: virtio_dev_queue_setup(): vring_size: 10244, rounded_vring_size: 12288
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134ea1000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbaea1000
  PMD: virtio_dev_rx_queue_setup():  >>
  PMD: virtio_dev_queue_setup(): setting up queue: 0
  PMD: virtio_dev_queue_setup(): vq_size: 256 nb_desc:128
  PMD: virtio_dev_queue_setup(): vring_size: 10244, rounded_vring_size: 12288
  PMD: virtio_dev_queue_setup(): vq->vq_ring_mem:      0x134e9c000
  PMD: virtio_dev_queue_setup(): vq->vq_ring_virt_mem: 0x7fbcbae9c000
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 1 is up
  PMD: virtio_dev_rxtx_start():  >>
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_vring_start(): Allocated 256 bufs
  PMD: virtio_dev_rxtx_start(): VQ: - size=256; free=0; used=0; 
desc_head_idx=32768; avail.idx=256; used_cons_idx=0; used.idx=0; 
avail.flags=0x1; used.flags=0x0
  PMD: virtio_dev_vring_start():  >>
  PMD: virtio_dev_rxtx_start(): VQ: - size=256; free=256; used=0; 
desc_head_idx=0; avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; 
used.flags=0x0
  PMD: virtio_dev_start(): nb_queues=1
  PMD: virtio_dev_start(): Notified backend at initialization
  PMD: virtio_dev_start(): VQ: - size=256; free=0; used=0; desc_head_idx=32768; 
avail.idx=256; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  PMD: virtio_dev_start(): VQ: - size=256; free=256; used=0; desc_head_idx=0; 
avail.idx=0; used_cons_idx=0; used.idx=0; avail.flags=0x1; used.flags=0x0
  rte_eth_dev_config_restore: port 1: MAC address array not supported
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf325c0 vq = 0x7fbcbaf325c0
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf325c0 vq = 0x7fbcbaf325c0
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 1 is up
  Port 1: DE:ED:02:04:01:60
  Checking link statuses...
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 0 is up
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 1 is up
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 0 is up
  Port 0 Link Up - speed 10000 Mbps - full-duplex
  PMD: virtio_dev_link_update(): Get link status from hw
  PMD: virtio_dev_link_update(): Port 1 is up
  Port 1 Link Up - speed 10000 Mbps - full-duplex
  Done
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf37880 vq = 0x7fbcbaf37880
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  PMD: virtio_send_command(): vq->vq_desc_head_idx = 0, status = 255, 
vq->hw->cvq = 0x7fbcbaf325c0 vq = 0x7fbcbaf325c0
  PMD: virtio_send_command(): vq->vq_queue_index = 2
  PMD: virtio_send_command(): vq->vq_free_cnt=64
  vq->vq_desc_head_idx=0
  testpmd> start
    io packet forwarding - CRC stripping disabled - packets/burst=32
    nb forwarding cores=1 - nb forwarding ports=2
    RX queues=1 - RX desc=128 - RX free threshold=0
    RX threshold registers: pthresh=0 hthresh=0 wthresh=0
    TX queues=1 - TX desc=512 - TX free threshold=0
    TX threshold registers: pthresh=0 hthresh=0 wthresh=0
    TX RS bit threshold=0 - TXQ flags=0xf00

  ...
  [wait a few seconds]
  ...

  Kill the application
  > kill -9 $(pidof testpmd) (On another shell)

  Relaunch the application
  > testpmd --huge-dir=/mnt/huge -n 4 -l 0-1 --socket-mem 128 -w 0000:00:04.0 \
    -w 0000:00:05.0 --log-level 8 -- -i --nb-cores=1 --nb-ports=2 \
    --total-num-mbufs=1025
  EAL: Detected lcore 0 as core 0 on socket 0
  EAL: Detected lcore 1 as core 0 on socket 0
  EAL: Support maximum 255 logical core(s) by configuration.
  EAL: Detected 2 lcore(s)
  EAL: Probing VFIO support...
  EAL: Module /sys/module/vfio_pci not found! error 2 (No such file or 
directory)
  EAL: VFIO modules not loaded, skipping VFIO support...
  EAL: Setting up physically contiguous memory...
  EAL: Ask a virtual area of 0x4400000 bytes
  EAL: Virtual area found at 0x7f86cde00000 (size = 0x4400000)
  EAL: Ask a virtual area of 0x400000 bytes
  EAL: Virtual area found at 0x7f86cd800000 (size = 0x400000)
  EAL: Ask a virtual area of 0x400000 bytes
  EAL: Virtual area found at 0x7f86cd200000 (size = 0x400000)
  EAL: Ask a virtual area of 0x200000 bytes
  EAL: Virtual area found at 0x7f86cce00000 (size = 0x200000)
  EAL: Ask a virtual area of 0xc00000 bytes
  EAL: Virtual area found at 0x7f86cc000000 (size = 0xc00000)
  EAL: Ask a virtual area of 0x1c00000 bytes
  EAL: Virtual area found at 0x7f86ca200000 (size = 0x1c00000)
  EAL: Ask a virtual area of 0x600000 bytes
  EAL: Virtual area found at 0x7f86c9a00000 (size = 0x600000)
  EAL: Ask a virtual area of 0x400000 bytes
  EAL: Virtual area found at 0x7f86c9400000 (size = 0x400000)
  EAL: Requesting 64 pages of size 2MB from socket 0
  ...

  VM has been killed by qemu with the following error
  > qemu-system-x86_64: Guest moved used index from 570 to 0

  Debugging
  ---------

  With GDB, I have got this backtrace for Qemu

  (gdb) bt full
  #0  __GI_exit (status=1) at exit.c:104
  No locals.
  #1  0x00007f13cb53412e in virtqueue_num_heads (vq=0x7f13ce28d4c0, idx=592)
      at /tmp/qemu/qemu-2.5.0/hw/virtio/virtio.c:320
          num_heads = 64944
  #2  0x00007f13cb53444e in virtqueue_get_avail_bytes (vq=0x7f13ce28d4c0, 
in_bytes=0x7fff5c036270,
      out_bytes=0x7fff5c036274, max_in_bytes=110, max_out_bytes=0) at 
/tmp/qemu/qemu-2.5.0/hw/virtio/virtio.c:381
          idx = 592
          total_bufs = 0
          in_total = 0
          out_total = 0
  #3  0x00007f13cb5344b6 in virtqueue_avail_bytes (vq=0x7f13ce28d4c0, 
in_bytes=110, out_bytes=0)
      at /tmp/qemu/qemu-2.5.0/hw/virtio/virtio.c:447
          in_total = 1543725744
          out_total = 32767
  #4  0x00007f13cb51ad6b in virtio_net_has_buffers (q=0x7f13ce22cea0, 
bufsize=110)
      at /tmp/qemu/qemu-2.5.0/hw/net/virtio-net.c:899
          n = 0x7f13cda08f18
  #5  0x00007f13cb51b37d in virtio_net_receive (nc=0x7f13cdf96490,
      buf=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98)
      at /tmp/qemu/qemu-2.5.0/hw/net/virtio-net.c:1037
          n = 0x7f13cda08f18
          q = 0x7f13ce22cea0
          vdev = 0x7f13cda08f18
          __func__ = "virtio_net_receive"
          mhdr_sg = {{iov_base = 0x7f1365fda43e, iov_len = 2}, {iov_base = 0x0, 
iov_len = 0} <repeats 1023 times>}
          mhdr = {hdr = {flags = 0 '\000', gso_type = 0 '\000', hdr_len = 0, 
gso_size = 0, csum_start = 0,
              csum_offset = 0}, num_buffers = 1}
          mhdr_cnt = 0
          offset = 98
          i = 1
          guest_offset = 12
          __PRETTY_FUNCTION__ = "virtio_net_receive"
  #6  0x00007f13cb75da86 in nc_sendv_compat (nc=0x7f13cdf96490, 
iov=0x7fff5c057440, iovcnt=1, flags=0) at net/net.c:717
          buf = '\000' <repeats 416 times>...
          buffer = 0x7fff5c057580 
"\336\355\001\246\223t\336\355\001\211\371\360\b"
          offset = 98
  #7  0x00007f13cb75db3e in qemu_deliver_packet_iov (sender=0x7f13cc902eb0, 
flags=0, iov=0x7fff5c057440, iovcnt=1,
      opaque=0x7f13cdf96490) at net/net.c:741
          nc = 0x7f13cdf96490
          ret = 0
  #8  0x00007f13cb75fa5f in qemu_net_queue_deliver (queue=0x7f13cdf966b0, 
sender=0x7f13cc902eb0, flags=0,
      data=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98) at net/queue.c:163
          ret = -1
          iov = {iov_base = 0x7fff5c057580, iov_len = 98}
  #9  0x00007f13cb75fb7b in qemu_net_queue_send (queue=0x7f13cdf966b0, 
sender=0x7f13cc902eb0, flags=0,
      data=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98, sent_cb=0x0) at net/queue.c:198
          ret = 139722994604174
  #10 0x00007f13cb75d8d9 in qemu_send_packet_async_with_flags 
(sender=0x7f13cc902eb0, flags=0,
      buf=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98, sent_cb=0x0) at net/net.c:677
          queue = 0x7f13cdf966b0
          ret = 0
  #11 0x00007f13cb75d911 in qemu_send_packet_async (sender=0x7f13cc902eb0,
      buf=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98, sent_cb=0x0) at net/net.c:684
  No locals.
  #12 0x00007f13cb75d93e in qemu_send_packet (nc=0x7f13cc902eb0,
      buf=0x7fff5c057580 "\336\355\001\246\223t\336\355\001\211\371\360\b", 
size=98) at net/net.c:690
  No locals.
  #13 0x00007f13cb76b49e in vde_to_qemu (opaque=0x7f13cc902eb0) at net/vde.c:47
          s = 0x7f13cc902eb0
          buf = "[...]"
          size = 98
  [...]

  According to GDB, there is no available vring
  (gdb) up
  #1  0x00007f13cb53412e in virtqueue_num_heads (vq=0x7f13ce28d4c0, idx=592)
      at /tmp/qemu/qemu-2.5.0/hw/virtio/virtio.c:320
  320           exit(1);
  (gdb) p num_heads
  $1 = 64944
  (gdb) p vq->vring.num
  $2 = 256
  (gdb) p idx
  $3 = 592
  (gdb) p vring_avail_idx(vq)
  $5 = 0

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