[Qemu-devel] [Bug 1808928] Re: Bitmap Extra data is not supported

[Ali Sag]

Sorry, because of log time, VM logs were removed. Journalctl for libvirtd is 
remain.. It was like that.
018-12-17 17:01:50.990+0000: 43198: error : qemuMonitorIORead:606 : Unable to 
read from monitor: Connection reset by peer
Dec 17 20:01:50 vm-kvm09 libvirtd[43198]: 2018-12-17 17:01:50.991+0000: 43198: 
error : qemuProcessReportLogError:1935 : internal error: qemu unexpectedly 
closed the monitor: .guest_agent.0 -chardev 
spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio
Dec 17 20:01:51 vm-kvm09 libvirtd[43198]: 2018-12-17T17:01:50.984315Z qemu-kvm: 
-drive 
file=/var/lib/libvirt/images/exo1-jb-h01-2.qcow2,format=qcow2,if=none,id=drive-virtio-disk1,cache=none:
 Bitmap extra data is not supported
Dec 17 20:02:02 vm-kvm09 libvirtd[43198]: 2018-12-17 17:02:02.652+0000: 43203: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:02:02 vm-kvm09 libvirtd[43198]: 2018-12-17 17:02:02.668+0000: 68990: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:02:02 vm-kvm09 libvirtd[43198]: 2018-12-17 17:02:02.683+0000: 17099: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:09:58 vm-kvm09 libvirtd[43198]: 2018-12-17 17:09:58.700+0000: 68889: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:09:58 vm-kvm09 libvirtd[43198]: 2018-12-17 17:09:58.717+0000: 43200: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:09:58 vm-kvm09 libvirtd[43198]: 2018-12-17 17:09:58.732+0000: 43202: 
warning : virQEMUCapsInit:923 : Failed to get host CPU cache info
Dec 17 20:09:59 vm-kvm09 libvirtd[43198]: 2018-12-17 17:09:59.144+0000: 43198: 
error : qemuMonitorIORead:606 : Unable to read from monitor: Connection reset 
by peer
Dec 17 20:09:59 vm-kvm09 libvirtd[43198]: 2018-12-17 17:09:59.145+0000: 43198: 
error : qemuProcessReportLogError:1935 : internal error: qemu unexpectedly 
closed the monitor: 2018-12-17T17:09:59.132340Z qemu-kvm: -drive 
file=/var/lib/libvirt/images/exo1-jb-h01-2.qcow2,f...

I keep the broken image file. I run some qemu-img commands:

> qemu-img check /var/lib/libvirt/images/exo1-jb-h01-2.qcow2.1712
qemu-img: Could not open '/var/lib/libvirt/images/exo1-jb-h01-2.qcow2.1712': 
Bitmap extra data is not supported

> qemu-img info /var/lib/libvirt/images/exo1-jb-h01-2.qcow2.1712
qemu-img: Could not open '/var/lib/libvirt/images/exo1-jb-h01-2.qcow2.1712': 
Bitmap extra data is not supported

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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.

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