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[Qemu-devel] [Bug 1808928] Re: Bitmap Extra data is not supported

From: John Snow
Subject: [Qemu-devel] [Bug 1808928] Re: Bitmap Extra data is not supported
Date: Tue, 12 Feb 2019 01:16:07 -0000

Hi, bitmap extensions have a field that allows us to attach
extra/arbitrary data to them. It is not currently used by QEMU. If this
field is set, it means something corrupted your qcow2.

Please make a backup of your qcow2 file first (because attempting to
repair a broken qcow2 can sometimes make it worse), and then please try
running qemu-img check to try and diagnose the image.

What happened to cause the "disastrous error", do you recall?

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  Bitmap Extra data is not supported

Status in QEMU:

Bug description:
  i am using dirty bitmaps and drive-backup. It works as aspected.

  Lately, i encounter a disastrous error. There is not any information
  about that situation. I cannot reach/open/attach/info or anything with
  a qcow2 file.

  virsh version
  Compiled against library: libvirt 4.10.0
  Using library: libvirt 4.10.0
  Using API: QEMU 4.10.0
  Running hypervisor: QEMU 2.12.0

  "qemu-img: Could not open '/var/lib/libvirt/images/test.qcow2': Bitmap
  extra data is not supported"

  what is that mean? what should i do?
  i cannot remove bitmap. i cannot open image or query.

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