id = 2912
title = "qcow2 image corrupted after snapshot+bitmap action"
state = "opened"
created_at = "2025-04-03T10:48:47.619Z"
closed_at = "n/a"
labels = ["Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2912"
host-os = "AlmaLinux 9"
host-arch = "x86_64"
qemu-version = "qemu-img-9.0.0-10.el9.2.1.x86_64"
guest-os = "CloudLinux 8"
guest-arch = "x86"
description = """When taking a backup of the VM via snapshot + bitmap, the qcow2 image became corrupt:
`qcow2: Marking image as corrupt: Preventing invalid write on metadata (overlaps with bitmap directory); further corruption events will be suppressed`

This resulted in a corrupt (unfix-able) image (see #2909).

While this process is something that happens multiple times a day, we never hit any issue.
The underlying storage didn't report any error, so it seems like something inside qemu broke the image."""
reproduce = """Unfortunately, I was unable to reproduce this issue yet."""
additional = """"""