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

[Bump]

Tied again with same .vdi as block device for 4 hours, didn't experience
further problems. don't know how to reproduce the issue again, even
don't know if has been fixed with any software update.

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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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