[Qemu-devel] [Bug 1120383] [NEW] incremental live block migration of qemu 1.3.1 doesn't work

[Reno Gan]

Public bug reported:

We tested qemu 1.3.1 for live migration of block device. It failed with
error.   Since qemu-kvm 1.2.0 is ok for this test, we think this problem
is introduced by new qemu 1.3.x releases.

To reproduce:

1. compile qemu 1.3.1:
    # cd qemu-1.3.1
    # ./configure --prefix=/usr --sysconfdir=/etc --target-list=x86_64-softmmu
    # make; make install

2. prepare source(172.16.1.13):
    # qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64     ###Note: 
wheezyx64 is a template image for Debian Wheezy 
    # qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -monitor stdio

3. prepare destination(172.16.1.14):
    # qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64    
    # qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -incoming 
tcp:0:4444

4. do live migrate:
    on source monitor command prompt, input:
    (qemu) migrate -i tcp:172.16.1.14:4444

monitor command will quit immediately and on destination host, there are errors 
thrown:
    Receiving block device images
    Co-routine re-entered recursively
    Aborted

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1120383

Title:
  incremental live block migration of qemu 1.3.1 doesn't work

Status in QEMU:
  New

Bug description:
  We tested qemu 1.3.1 for live migration of block device. It failed
  with error.   Since qemu-kvm 1.2.0 is ok for this test, we think this
  problem is introduced by new qemu 1.3.x releases.

  To reproduce:

  1. compile qemu 1.3.1:
      # cd qemu-1.3.1
      # ./configure --prefix=/usr --sysconfdir=/etc --target-list=x86_64-softmmu
      # make; make install

  2. prepare source(172.16.1.13):
      # qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64     ###Note: 
wheezyx64 is a template image for Debian Wheezy 
      # qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -monitor 
stdio

  3. prepare destination(172.16.1.14):
      # qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64    
      # qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -incoming 
tcp:0:4444

  4. do live migrate:
      on source monitor command prompt, input:
      (qemu) migrate -i tcp:172.16.1.14:4444

  monitor command will quit immediately and on destination host, there are 
errors thrown:
      Receiving block device images
      Co-routine re-entered recursively
      Aborted

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