Re: [Qemu-devel] After executing "savevm", the QEMU process is hanging

[Liuji (Jeremy)]

Hi, Stefan

Thanks for your reply.

I have test the latest version of 
qemu.git/master(commit:9196dd411d580c27f85daa209ff9a501d719ebc0,2013-04-06). 
But, this problem still exists.

This problem appears after the commit(500f0061d628b52220038939728f0d7aee634468, 
Use qemu_put_buffer_async for guest memory pages).
But I'm not sure why this commit cause this problem.

I simplified the qemu-kvm command to the below:
qemu-system-x86_64 --enable-kvm -m 1024 -smp 2 -boot c -drive 
file=/home/test/winxp.qcow2,
                   if=virtio,index=0,format=qcow2 -monitor stdio -vnc 
186.100.8.131:1

Best Regards,

Jeremy Liu

> Re: [Qemu-devel] After executing "savevm", the QEMU process is
> hanging
> 
> On Mon, Apr 01, 2013 at 11:45:13AM +0000, Liuji (Jeremy) wrote:
> > Hello, everyone
> >
> > After executing the "savevm" command, the QEMU process is hanging.
> > But in the v1.4.0, it's no problem.
> >
> > Host OS: Fedora 17 x86_64
> > Qemu: the latest(2013-04-01)
> > Quest OS: WinXP
> >
> > 1) Use the following command to start the VM:
> >     qemu-kvm -enable-kvm -name winxp -M pc-0.15 -m 1024 -smp 2 -boot c
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
> >     -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive
> file=/home/test/winxp.qcow2,if=virtio,index=0,format=qcow2
> >     -net nic,model=virtio,macaddr=52:54:00:05:11:12 -monitor stdio
> -chardev spicevmc,id=charchannel0,name=vdagent
> >     -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,na
> me=com.redhat.spice.0 -chardev pty,id=charchannel1
> >     -device
> virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,na
> me=arbitrary.virtio.serial.port.name -device usb-tablet,id=input0
> >     -spice
> port=3001,addr=186.100.8.131,disable-ticketing,plaintext-channel=main,plaint
> ext-channel=playback,plaintext-channel=record,image-compression=auto_glz
> >     -vga qxl -global qxl-vga.vram_size=67108864 -device
> AC97,id=sound0,bus=pci.0,addr=0x4
> > 2) Execute the "savevm" command in the qemu monitor.
> >    After a long time (>20minute), the qemu process is still hanging.
> >
> > Who can give me some advice?
> 
> Have you tried qemu.git/master?
> 
> Once you find out which version works and which is broken, you can use
> git-bisect(1) to find the commit that broke "savevm".
> 
> Stefan