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

[John Snow]

I agree, the program doesn't stop you from doing such things. It should
work without error, but it might be slow. Just offering some advice you
may not want to use it like this.

Try to reproduce with qcow2 and qemu-nbd to see if the problem is with
our support of the disk image format or if it's a problem with e.g. the
access patterns and qemu-nbd itself, for instance.

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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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