device: 0.213
other: 0.146
vnc: 0.081
performance: 0.079
files: 0.077
semantic: 0.066
PID: 0.061
debug: 0.055
permissions: 0.053
socket: 0.050
graphic: 0.040
network: 0.033
boot: 0.025
KVM: 0.022
files: 0.198
device: 0.140
other: 0.113
debug: 0.106
PID: 0.082
KVM: 0.076
semantic: 0.058
performance: 0.049
socket: 0.039
network: 0.034
vnc: 0.032
graphic: 0.026
permissions: 0.026
boot: 0.022

formating vdi-disk over nbd fails

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
#Format hangs up due to IO errors.
#Tested on Fedora 31, kernel 5.5.7-200.fc31.x86_64

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



The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting older bugs to "Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


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