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[Qemu-devel] [Bug 1597138] Re: Deadlock on Windows 10 pop-up

From: Shannon Barber
Subject: [Qemu-devel] [Bug 1597138] Re: Deadlock on Windows 10 pop-up
Date: Wed, 29 Jun 2016 00:04:07 -0000

Removing the soundhw hda device prevents the deadlock.

Below was my QEmu start-up command-line:

qemu-system-x86_64 \
-enable-kvm \
-m 8192 \
-drive if=pflash,format=raw,readonly,file=./ovmf-x64/OVMF-pure-efi.fd \
-drive if=pflash,format=raw,file=./OVMF-pure-efi-Win10.fd \
-drive file=/dev/Stuff/Windows10,format=raw,if=virtio,cache=none \
-drive file=virtio-win.iso,id=virtiocd,if=none,format=raw -device 
ide-cd,bus=ide.1,drive=virtiocd \
-device vfio-pci,host=01:00.0,addr=09.0,multifunction=on,x-vga=on \
-device vfio-pci,host=01:00.1,addr=09.1 \
-usb -usbdevice host:003.006 \
-cpu core2duo,+nx,kvm=off \
-vga none \
-soundhw hda

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  Deadlock on Windows 10 pop-up

Status in QEMU:

Bug description:
  I was able to install and can log in but whenever a pop-up is attempted the 
VM appears to deadlock.
  I can still kill -9 the process and recover but the VM and the QEmu console 
both hang with no error output.

  At first I thought it was UAC but renaming a file causes a pop-up and that 
also deadlocks.
  I rebuilt QEmu 2.6.0 with debug info and did a thread back-trace once the 
deadlock occurs.
  See the attachment for the trace.

  I am attempting to setup GPU pass-thru with a GTX 970 but this
  deadlock occurs with -vga std (and no GPU pass-thru) as well.

  (I cannot install or start Windows 7 but I am told this is a known

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