[Qemu-devel] [Bug 1754542] Re: colo: secondary vm crash when execute x-colo-lost-heartbeat

[李穗恒]

** Description changed:

  I use Arch Linux x86_64
  both qemu 2.11.1 and Zhang 
Chen's(https://github.com/zhangckid/qemu/commits/colo-with-virtio-net-internal-jul10)
  Following document 'COLO-FT.txt',
  I test colo feature on my hosts
  
  I run this command
  Primary:
  sudo qemu-system-x86_64 -boot c   -enable-kvm -m 2048 -smp 2  -qmp stdio  
-name primary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive 
if=virtio,id=colo-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,children.0.file.filename=/var/lib/libvirt/images/1.raw,children.0.driver=raw
 -S
  
  Secondary:
  sudo qemu-system-x86_64 -boot c -enable-kvm -m 2048 -smp 2 -qmp stdio  -name 
secondary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive 
if=none,id=colo-disk0,file.filename=/var/lib/libvirt/images/2.raw,driver=raw,node-name=node0
 \
  -drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
  file.driver=qcow2,top-id=active-disk0,\
  file.file.filename=/mnt/ramfs/active_disk.img,\
  file.backing.driver=qcow2,\
  file.backing.file.filename=/mnt/ramfs/hidden_disk.img,\
  file.backing.backing=colo-disk0 \
  -incoming tcp:0:8888
  
  Secondary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'nbd-server-start',
    'arguments': {'addr': {'type': 'inet', 'data': {'host': '192.168.0.33', 
'port': '8889'} } }
  }
  {'execute': 'nbd-server-add', 'arguments': {'device': 'colo-disk0', 
'writable': true } }
  
  Primary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'human-monitor-command',
-   'arguments': {'command-line': 'drive_add -n buddy 
driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.33,file.port=8889,file.export=colo-disk0,node-name=nbd_client0'}}
+   'arguments': {'command-line': 'drive_add -n buddy 
driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.34,file.port=8889,file.export=colo-disk0,node-name=nbd_client0'}}
  { 'execute':'x-blockdev-change', 'arguments':{'parent': 'colo-disk0', 'node': 
'nbd_client0' } }
  { 'execute': 'migrate-set-capabilities',
        'arguments': {'capabilities': [ {'capability': 'x-colo', 'state': true 
} ] } }
- { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.33:8888' } }
+ { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.34:8888' } }
  { 'execute': 'migrate-set-parameters' , 'arguments':{ 'x-checkpoint-delay': 
2000 } }
  
  Above are all OK.Two VM syncing.
  
  Primary:
  { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 
'child': 'children.1'}}
  { 'execute': 'human-monitor-command','arguments': {'command-line': 'drive_del 
blk-buddy0'}}
  
  Secondary:
  { 'execute': 'nbd-server-stop' }
  { 'execute': 'x-colo-lost-heartbeat' }
  
  But When I execute x-colo-lost-heartbeat.Primary run Secondary cash
  
   { 'execute': 'nbd-server-stop' }
  {"return": {}}
  qemu-system-x86_64: Disconnect client, due to: Unexpected end-of-file before 
all bytes were read
   { 'execute': 'x-colo-lost-heartbeat' }
  {"return": {}}
  qemu-system-x86_64: Can't receive COLO message: Input/output error
  **
  ERROR:/build/qemu/src/qemu-2.11.1/qom/object.c:907:object_unref: assertion 
failed (obj->ref > 0): (0 > 0)
  [1]    2972 abort      sudo /usr/bin/qemu-system-x86_64 -boot c -enable-kvm 
-m 2048 -smp 2 -qmp stdi

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https://bugs.launchpad.net/bugs/1754542

Title:
  colo: secondary vm crash when execute x-colo-lost-heartbeat

Status in QEMU:
  New

Bug description:
  I use Arch Linux x86_64
  both qemu 2.11.1 and Zhang 
Chen's(https://github.com/zhangckid/qemu/commits/colo-with-virtio-net-internal-jul10)
  Following document 'COLO-FT.txt',
  I test colo feature on my hosts

  I run this command
  Primary:
  sudo qemu-system-x86_64 -boot c   -enable-kvm -m 2048 -smp 2  -qmp stdio  
-name primary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive 
if=virtio,id=colo-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,children.0.file.filename=/var/lib/libvirt/images/1.raw,children.0.driver=raw
 -S

  Secondary:
  sudo qemu-system-x86_64 -boot c -enable-kvm -m 2048 -smp 2 -qmp stdio  -name 
secondary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive 
if=none,id=colo-disk0,file.filename=/var/lib/libvirt/images/2.raw,driver=raw,node-name=node0
 \
  -drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
  file.driver=qcow2,top-id=active-disk0,\
  file.file.filename=/mnt/ramfs/active_disk.img,\
  file.backing.driver=qcow2,\
  file.backing.file.filename=/mnt/ramfs/hidden_disk.img,\
  file.backing.backing=colo-disk0 \
  -incoming tcp:0:8888

  Secondary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'nbd-server-start',
    'arguments': {'addr': {'type': 'inet', 'data': {'host': '192.168.0.33', 
'port': '8889'} } }
  }
  {'execute': 'nbd-server-add', 'arguments': {'device': 'colo-disk0', 
'writable': true } }

  Primary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'human-monitor-command',
    'arguments': {'command-line': 'drive_add -n buddy 
driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.34,file.port=8889,file.export=colo-disk0,node-name=nbd_client0'}}
  { 'execute':'x-blockdev-change', 'arguments':{'parent': 'colo-disk0', 'node': 
'nbd_client0' } }
  { 'execute': 'migrate-set-capabilities',
        'arguments': {'capabilities': [ {'capability': 'x-colo', 'state': true 
} ] } }
  { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.34:8888' } }
  { 'execute': 'migrate-set-parameters' , 'arguments':{ 'x-checkpoint-delay': 
2000 } }

  Above are all OK.Two VM syncing.

  Primary:
  { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 
'child': 'children.1'}}
  { 'execute': 'human-monitor-command','arguments': {'command-line': 'drive_del 
blk-buddy0'}}

  Secondary:
  { 'execute': 'nbd-server-stop' }
  { 'execute': 'x-colo-lost-heartbeat' }

  But When I execute x-colo-lost-heartbeat.Primary run Secondary cash

   { 'execute': 'nbd-server-stop' }
  {"return": {}}
  qemu-system-x86_64: Disconnect client, due to: Unexpected end-of-file before 
all bytes were read
   { 'execute': 'x-colo-lost-heartbeat' }
  {"return": {}}
  qemu-system-x86_64: Can't receive COLO message: Input/output error
  **
  ERROR:/build/qemu/src/qemu-2.11.1/qom/object.c:907:object_unref: assertion 
failed (obj->ref > 0): (0 > 0)
  [1]    2972 abort      sudo /usr/bin/qemu-system-x86_64 -boot c -enable-kvm 
-m 2048 -smp 2 -qmp stdi

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