Hi I was trying to list files inside a directory of my qcow2 image using virt-ls -a hda.qcow2 /boot Seems that call to qemu-img is not aligned with current version if qemu since I have this in debug info: Backing file specified without backing format now flag -F for backing format is required Here's full debug log: libguestfs: trace: set_verbose true libguestfs: trace: set_verbose = 0 libguestfs: create: flags = 0, handle = 0x55bc796a24f0, program = virt-ls libguestfs: trace: add_drive "hda.qcow2" "readonly:true" libguestfs: creating COW overlay to protect original drive content libguestfs: trace: get_tmpdir libguestfs: trace: get_tmpdir = "/tmp" libguestfs: trace: disk_create "/tmp/libguestfsjjrQ6y/overlay1.qcow2" "qcow2" -1 "backingfile:/home/user/Emulators/qemu/hda.qcow2" libguestfs: command: run: qemu-img libguestfs: command: run: \ create libguestfs: command: run: \ -f qcow2 libguestfs: command: run: \ -o backing_file=/home/user/Emulators/qemu/hda.qcow2 libguestfs: command: run: \ /tmp/libguestfsjjrQ6y/overlay1.qcow2 qemu-img: /tmp/libguestfsjjrQ6y/overlay1.qcow2: Backing file specified without backing format Detected format of qcow2.libguestfs: error: qemu-img: /tmp/libguestfsjjrQ6y/overlay1.qcow2: qemu-img exited with error status 1, see debug messages above libguestfs: trace: disk_create = -1 (error) libguestfs: trace: add_drive = -1 (error) libguestfs: trace: close libguestfs: closing guestfs handle 0x55bc796a24f0 (state 0) libguestfs: command: run: rm libguestfs: command: run: \ -rf /tmp/libguestfsjjrQ6y I've seen similar bug described here: https://www.mail-archive.com/ debian-bugs-dist(a)lists.debian.org/msg1816903.html