Hi, bitmap extensions have a field that allows us to attach extra/arbitrary data to them. It is not currently used by QEMU. If this field is set, it means something corrupted your qcow2.
Please make a backup of your qcow2 file first (because attempting to repair a broken qcow2 can sometimes make it worse), and then please try running qemu-img check to try and diagnose the image. What happened to cause the "disastrous error", do you recall? -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1808928 Title: Bitmap Extra data is not supported Status in QEMU: New Bug description: i am using dirty bitmaps and drive-backup. It works as aspected. Lately, i encounter a disastrous error. There is not any information about that situation. I cannot reach/open/attach/info or anything with a qcow2 file. virsh version Compiled against library: libvirt 4.10.0 Using library: libvirt 4.10.0 Using API: QEMU 4.10.0 Running hypervisor: QEMU 2.12.0 "qemu-img: Could not open '/var/lib/libvirt/images/test.qcow2': Bitmap extra data is not supported" what is that mean? what should i do? i cannot remove bitmap. i cannot open image or query. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1808928/+subscriptions
