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

[Wenchao Xia]

于 2013-3-30 18:38, Liuji (Jeremy) 写道:
> 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?
> 
> 
> ------------------
> Best Regards,
> 
> Jeremy Liu
>
  Seems some step missing for spice server, need to check the status in
migration.


-- 
Best Regards

Wenchao Xia