[Qemu-devel] [Bug 1434779] [NEW] qemu hangs on live-migration with storage(virtual machine: windows Server 2008 with only one disk )

[youyunyehe]

Public bug reported:

Hi,
We are using “Windows Server 2008” with qemu-kvm-2.0.1 (linux kernel:3.10.0) as 
a host of  a VM.
Using drive_mirror to do  live-migration on the same host for different disks
Local disk: /sf/data/local/
Shared disk(iscsi): /sf/other/local/    ---  the disk is busy, the IO rate is  
about  30MB/s
qemu-system-x86_64 -k en-us -m 2048 -smp 2 -vnc :3100 -usbdevice tablet -boot c 
-enable-kvm -drive 
file=/sf/data/local/vm-disk-1.qcow2,if=none,id=drive-ide0,cache=none,aio=native 
-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=100 

Step 1:
Start migration: Drive_mirror -f drive-ide0  /sf/other/local/test.qcow2

Step 2:
When detect the migration has completed, then send cmd: block_job_complete -f 
drive-ide0

Step 3:
send cmd: info status 
What surprised me is that the qemu monitor reports can’t be connected.

Then find bellows:
The  qemu process hangs on the 
mirror_run->bdrv_drain_all->aio_poll->qemu_poll_ns->ppoll (),
None events were received and poll forever. I don’t know why the aio can’t be 
responsed. This case is hardly to
be generated but it really happens sometimes . I’m looking forward to getting 
help from you .
The stack capture snapshot:


Thanks 
MyAngle

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: drive migration mirror

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https://bugs.launchpad.net/bugs/1434779

Title:
  qemu hangs on live-migration with storage(virtual machine: windows
  Server 2008 with only one disk )

Status in QEMU:
  New

Bug description:
  Hi,
  We are using “Windows Server 2008” with qemu-kvm-2.0.1 (linux kernel:3.10.0) 
as a host of  a VM.
  Using drive_mirror to do  live-migration on the same host for different disks
  Local disk: /sf/data/local/
  Shared disk(iscsi): /sf/other/local/    ---  the disk is busy, the IO rate is 
 about  30MB/s
  qemu-system-x86_64 -k en-us -m 2048 -smp 2 -vnc :3100 -usbdevice tablet -boot 
c -enable-kvm -drive 
file=/sf/data/local/vm-disk-1.qcow2,if=none,id=drive-ide0,cache=none,aio=native 
-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=100 

  Step 1:
  Start migration: Drive_mirror -f drive-ide0  /sf/other/local/test.qcow2

  Step 2:
  When detect the migration has completed, then send cmd: block_job_complete -f 
drive-ide0

  Step 3:
  send cmd: info status 
  What surprised me is that the qemu monitor reports can’t be connected.

  Then find bellows:
  The  qemu process hangs on the 
mirror_run->bdrv_drain_all->aio_poll->qemu_poll_ns->ppoll (),
  None events were received and poll forever. I don’t know why the aio can’t be 
responsed. This case is hardly to
  be generated but it really happens sometimes . I’m looking forward to getting 
help from you .
  The stack capture snapshot:

  
  Thanks 
  MyAngle

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