[Qemu-devel] [Bug 1079713] Re: failed to set sndbuf on VMs network interface

[Serge Hallyn <1079713@bugs.launchpad.net>]

Latest upstream qemu.git still reproduces this, so marking it as
affecting QEMU.

** Also affects: qemu
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1079713

Title:
  failed to set sndbuf on VMs network interface

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  I am trying to set "sndbuf" for a VMs network device to "0".
  I inserted to my XML file:
        <tune>
          <sndbuf>0</sndbuf>
        </tune>
  The XML file validates, but I am not able to start the virtual machine.

  # virsh edit vm3
  <domain type='kvm'>
    <name>vm3</name>
    <uuid><HIDDEN></uuid>
    <memory unit='KiB'>524288</memory>
    <currentMemory unit='KiB'>524288</currentMemory>
    <vcpu placement='static'>1</vcpu>
    <os>
      <type arch='x86_64' machine='pc-1.2'>hvm</type>
      <boot dev='hd'/>
    </os>
    <features>
      <acpi/>
      <apic/>
      <pae/>
    </features>
    <clock offset='utc'/>
    <on_poweroff>destroy</on_poweroff>
    <on_reboot>restart</on_reboot>
    <on_crash>restart</on_crash>
    <devices>
      <emulator>/usr/bin/kvm</emulator>
      <disk type='file' device='disk'>
        <driver name='qemu' type='qcow2'/>
        <source file='<HIDDEN>'/>
        <target dev='vda' bus='virtio'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
      </disk>
      <controller type='usb' index='0'>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
      </controller>
      <interface type='bridge'>
        <mac address='<HIDDEN>'/>
        <source bridge='br2'/>
        <model type='virtio'/>
        <tune>
          <sndbuf>0</sndbuf>
        </tune>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
      </interface>
      <serial type='pty'>
        <target port='0'/>
      </serial>
      <console type='pty'>
        <target type='serial' port='0'/>
      </console>
      <input type='mouse' bus='ps2'/>
      <graphics type='vnc' port='-1' autoport='yes'/>
      <sound model='ich6'>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
      </sound>
      <video>
        <model type='cirrus' vram='9216' heads='1'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
      </video>
      <memballoon model='virtio'>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
      </memballoon>
    </devices>
  </domain>

  Domain vm3 XML configuration edited.

  # LANG=en_US.utf-8 virsh start vm3
  error: Failed to start domain vm3
  error: internal error Process exited while reading console log output: char device redirected to /dev/pts/4

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