[Qemu-devel] A crash problem about "loadvm"

[Liuji (Jeremy)]

Hello, everyone

 

I found a problem about "loadvm", when I use Spice.

 

Host OS: Fedora 17

Qemu: 1.4.0

Spice: 0.12.2

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,name=com.redhat.spice.0 -chardev pty,id=charchannel1

    -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=arbitrary.virtio.serial.port.name -device usb-tablet,id=input0

    -spice port=3001,addr=186.100.8.131,disable-ticketing,plaintext-channel=main,plaintext-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) Use spice client to connect the VM.

3) Exec the "savevm" command in the qemu monitor.

4) List snapshot information:

    info snapshots

    ID        TAG                 VM SIZE                DATE       VM CLOCK

    1         vm-20130330181626      224M 2013-03-30 18:16:26   00:00:17.294

 

5) Load the snapshot. But the process crashed:

    loadvm vm-20130330181626

    red_dispatcher_loadvm_commands:

    Segmentation fault (core dumped)

 

I use the GDB to analyze the core-dump file:

    #0  0x00007f6cbdc37a15 in spice_char_device_write_to_device (dev=0x7f6cc5248320) at char_device.c:439

    439      sif = SPICE_CONTAINEROF(dev->sin->base.sif, SpiceCharDeviceInterface, base);

    (gdb) p dev

    $1 = (SpiceCharDeviceState *) 0x7f6cc5248320

    (gdb) p dev->sin

    $2 = (SpiceCharDeviceInstance *) 0x0

 

I have always found this problem after the commit(fc24f3bd2ed4c97c99ad40e747732ae46dff2009 "spice: notify spice server on vm start/stop").

 

Could you give me some advices to debug this problem?

 

 

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Best Regards,

 

Jeremy Liu