[Bug 1674117] Re: Qemu VM start kills Pulseaudio

[Launchpad Bug Tracker <1674117@bugs.launchpad.net>]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1674117

Title:
  Qemu VM start kills Pulseaudio

Status in QEMU:
  Expired

Bug description:
  When I start a VM (start command below) in Qemu version >2.5, it kills Pulseaudio (paired with a huge lagspike) in ~4/5 cases. Using version 2.5 build from GIT, it works fine. This also happens when building from the current GIT master (ebedf0f).
  Host:
    Freshly installed Antergos Arch Linux 4.10.3-1-ARCH
    Intel I7-5930K
    ASUS X99 Deluxe II latest UEFI
    GTX 770

  Guest:
    Windows 10 x64
    AMD RX480 via VFIO

  This also happened on my last install (Ubuntu GNOME 16.10).

  Start command:
    QEMU_AUDIO_DRV=pa \
    QEMU_PA_SAMPLES=4096 \
    qemu-system-x86_64 \
      -serial none \
      -parallel none \
      -nodefconfig \
      -nodefaults \
      -name win10 \
      -enable-kvm \
      -cpu host,check,kvm=off \
      -smp 12,sockets=1,cores=6,threads=2 \
      -m 16G \
      -mem-prealloc \
      -device nec-usb-xhci,id=xhci \
      -device usb-host,vendorid=0x05ac,productid=0x0205,bus=xhci.0 \
      -net nic,vlan=0,model=virtio \
      -net bridge,vlan=0,br=bridge0 \
      -object iothread,id=iothread0 \
      -device virtio-blk-pci,iothread=iothread0,drive=drive0 \
      -drive file="$DISK",format=raw,if=none,cache=none,aio=native,id=drive0 \
      -boot order=c,menu=on \
      -rtc base=utc \
      -nographic \
      -k de \
      -monitor stdio \
      -soundhw hda \
      -device vfio-pci,host=02:00.0,addr=09.0,multifunction=on,x-vga=on \
      -device vfio-pci,host=02:00.1,addr=09.1 \
      -device vfio-pci,host=04:00.0,addr=07.0,multifunction=on,id=usbcontroller

  When it kills Pulseaudio, I see these errors in the Qemu console:
    pulseaudio: set_sink_input_volume() failed
    pulseaudio: Reason: Bad state
    pulseaudio: set_sink_input_mute() failed
    pulseaudio: Reason: Bad state
    pulseaudio: set_source_output_volume() failed
    ... many more of these ...

  The journal shows that PulseAudio is killed:
    Mär 19 13:12:42 hp-desktop systemd[530]: pulseaudio.service: Main process exited, code=killed, status=9/KILL
    Mär 19 13:12:42 hp-desktop systemd[530]: pulseaudio.service: Unit entered failed state.
    Mär 19 13:12:42 hp-desktop systemd[530]: pulseaudio.service: Failed with result 'signal'.
    Mär 19 13:12:42 hp-desktop systemd[530]: pulseaudio.service: Service hold-off time over, scheduling restart.
    Mär 19 13:12:42 hp-desktop systemd[530]: Stopped Sound Service.
    Mär 19 13:12:42 hp-desktop systemd[530]: Starting Sound Service...

  I've also captured a PulseAudio debug log when this happens, but it
  does not contain anything interesting (no warnings or errors), which
  makes sense in case of SIGKILL.

  In DMESG I get some errors too, but they seem to be just symptoms (but Im just guessing...); 00:14.0 is the USB controller my DAC is connected to:
    [ 4372.389051] usb 3-9.4: current rate 4500480 is different from the runtime rate 44100
    [ 4372.509163] usb 3-9.4: current rate 4500480 is different from the runtime rate 44100
    [ 4372.559104] usb 3-9.4: current rate 4500480 is different from the runtime rate 44100
    [ 4373.652557] xhci_hcd 0000:00:14.0: ERROR unknown event type 37
    [ 4373.712382] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 36
    [ 4373.715714] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000745da7f00 trb-start 0000000745da7f10 trb-end 0000000745da7f10 seg-start 0000000745da7000 seg-end 0000000745da7ff0
    [ 4373.719055] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1
    [ 4373.722381] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000745da7f00 trb-start 0000000745da7f10 trb-end 0000000745da7f10 seg-start 0000000745da7000 seg-end 0000000745da7ff0
    [ 4373.725753] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4 comp_code 13
    [ 4373.725759] xhci_hcd 0000:00:14.0: Looking for event-dma 000000073c5a51a0 trb-start 000000073c5a51b0 trb-end 000000073c5a51b0 seg-start 000000073c5a5000 seg-end 000000073c5a5ff0

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