id = 1923
title = "qemu breaks vmdk larger than 600GB."
state = "closed"
created_at = "2023-10-06T03:52:45.280Z"
closed_at = "2023-11-28T16:22:38.680Z"
labels = ["block:vmdk", "workflow::Patch available"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1923"
host-os = "ubuntu 22.04"
host-arch = "x86"
qemu-version = "master qemu-nbd 8.1.50 (v8.1.0-1353-g2f3913f4b2)"
guest-os = "n/a"
guest-arch = "n/a"
description = """The vmdk larger than 600G is corrupted after an edit by qemu-nbd. If I open the corrupted vmdk file, I find an extra **^@** byte.
```
RW 4194304 SPARSE "disk-s289.vmdk"
RW 4^@94304 SPARSE "disk-s290.vmdk"
RW 4194304 SPARSE "disk-s291.vmdk"
```"""
reproduce = """```
   qemu-img create -f vmdk -o subformat=twoGbMaxExtentSparse disk.vmdk 1T
   sudo qemu-nbd -c /dev/nbd0 disk.vmdk
   sudo mkfs.btrfs /dev/nbd0
   sudo qemu-nbd -d /dev/nbd0
   qemu-img info disk.vmdk | head
   ```"""
additional = """"""