id = 2909
title = "Corrupt qcow2 images with broken bitmap unfixable"
state = "opened"
created_at = "2025-04-02T06:54:12.215Z"
closed_at = "n/a"
labels = ["Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2909"
host-os = "AlmaLinux 9"
host-arch = "x86_64"
qemu-version = "qemu-img-9.0.0-10.el9.2.1.x86_64"
guest-os = "n/a"
guest-arch = "n/a"
description = """During a backup of a VM (via bitmaps), the disk of the VM/Snapshot went out of space.
The VM was stopped, leaving the image in a bad state.

But now when trying to repair it, it was stuck:
```
# qemu-img check -r all /dev/mapper/e1d2ff33--c3fd--4c1a--bcd1--2047e4efc362-efbd8056--720a--47b6--bede--4325d576ffb9
qemu-img: Could not open '/dev/mapper/e1d2ff33--c3fd--4c1a--bcd1--2047e4efc362-efbd8056--720a--47b6--bede--4325d576ffb9': Bitmap '' doesn't satisfy the constraints
```

But if you want to remove the bitmap:
```
# qemu-img bitmap --remove /dev/mapper/e1d2ff33--c3fd--4c1a--bcd1--2047e4efc362-efbd8056--720a--47b6--bede--4325d576ffb9 ''
qemu-img: Could not open '/dev/mapper/e1d2ff33--c3fd--4c1a--bcd1--2047e4efc362-efbd8056--720a--47b6--bede--4325d576ffb9': qcow2: Image is corrupt; cannot be opened read/write
```

It seems like qemu-img check needs some option to clear invalid bitmaps. So the image can be repaired including dropping the invalid bitmap."""
reproduce = "n/a"
additional = "n/a"