[Qemu-devel] [Bug 1712818] Re: live migration with storage encounter assert(!(bs->open_flags & BDRV_O_INACTIVE)) crashes

[meeho yuen]

Thank you,I will try it.

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https://bugs.launchpad.net/bugs/1712818

Title:
  live migration with storage encounter assert(!(bs->open_flags &
  BDRV_O_INACTIVE)) crashes

Status in QEMU:
  New

Bug description:
  The vm guest runs a iotest program, and i migrate it with virsh
  --copy-storage-all,then the qemu process on the source host happens to
  crash with the following message:

  kvm: block/io.c:1543: bdrv_co_pwritev: Assertion `!(bs->open_flags & 0x0800)' 
failed.
  2017-08-24 11:43:45.919+0000: shutting down, reason=crashed

  here is the release:
  qemu 2.7 & 2.10.rc3 were tested.
  libvirt 3.0.0 & 3.2.0 were tested.

  command line:
  src_host:virsh migrate --verbose --live --persistent --copy-storage-all 
vm-core qemu+ssh://dst_host/system

  Possible Reason: After bdrv_inactivate_all() was called, mirror_run
  coroutine still writes the left dirty disk data to remote nbd server,
  which triggers the assertion. But I don't known how to avoid the
  problem, help is needed!  Thanks.

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