[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[John Snow]

I don't recommend you use VDI images in this way; we do not intend to
support performant RW access; support for VDI images is there to convert
to qcow2 or raw, generally.

That said, some questions that might be interesting to know the answer
to:

- Try converting your VDI image to raw or qcow2 and mounting that instead. Does 
the conversion work successfully? Can you export that image via qemu-nbd and 
mount it? Does it work?
- Do non-BTRFS filesystems cause any problems?

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https://bugs.launchpad.net/bugs/1877418

Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has 
GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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