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+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
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