[Bug 1866792] Re: formating vdi-disk over nbd fails

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1866792

Title:
  formating vdi-disk over nbd fails

Status in QEMU:
  Expired

Bug description:
  Hi,
  after creating a vdi-image with qemu-vdi and attaching it with qemu-nbd 
partitioning works fine, but the system hangs up during formating with 
mkfs.ext4.

  Same procedure with qcow2-image works fine
  Tested on Fedora 31 kernel  5.5.7-200.fc31.x86_64

  -----------------
  #! /bin/sh

  qemu-img create -f qcow2 ~/test.qcow2 32G
  #qemu-img version 4.1.1 (qemu-4.1.1-1.fc31)

  modprobe nbd max_part=8
  qemu-nbd --connect=/dev/nbd2 ~/test.qcow2
  #qemu-nbd 4.1.1 (qemu-4.1.1-1.fc31)

  parted -s /dev/nbd2 "mklabel gpt"
  parted -s -a optimal /dev/nbd2 "mkpart test ext4 2048 32G "
  parted  -s -a optimal /dev/nbd2 "p"

  mkfs.ext4 /dev/nbd2p1

  mkdir /mnt/test_qcow2

  mount /dev/nbd2p1 /mnt/test_qcow2
  df -H

  -------------------
  #! /bin/sh

  qemu-img create -f vdi ~/test.vdi 32G

  modprobe nbd max_part=8
  qemu-nbd --connect=/dev/nbd4 ~/test.vdi

  parted -s /dev/nbd4 "mklabel gpt"
  parted -s -a optimal /dev/nbd4 "mkpart test ext4 2048 32G "
  parted  -s -a optimal /dev/nbd4 "p"

  mkfs.ext4 /dev/nbd4p1
  #Format hangs up due to IO errors
  #Tested on Fedora 31 kernel  5.5.7-200.fc31.x86_64

  mkdir /mnt/test_vdi

  mount /dev/nbd4p1 /mnt/test_vdi
  df -H
  ----------------------

  Kind regards
    Eilert

  PS.: There may be a connection to this bug:
  ​
  #1661758 qemu-nbd causes data corruption in VDI-format disk images

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