Bug 1999419

Summary: libguestfs breaks with qemu 6.1 with error "Backing file specified without backing format"
Product: Red Hat Enterprise Linux 9 Reporter: Richard W.M. Jones <rjones>
Component: libguestfsAssignee: Richard W.M. Jones <rjones>
Status: CLOSED ERRATA QA Contact: YongkuiGuo <yoguo>
Severity: high Docs Contact:
Priority: high    
Version: 9.0CC: eblake, kkiwi, lersek, mxie, rjones, tyan, tzheng, virt-maint, vwu, xiaodwan, yoguo
Target Milestone: rcKeywords: Triaged
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: libguestfs-1.45.6-14.el9 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2022-05-17 12:28:37 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1998820    
Bug Blocks:    

Description Richard W.M. Jones 2021-08-31 07:45:07 UTC 
This bug was initially created as a copy of Bug #1998820

Launch the libguestfs appliance (eg. libguestfs-test-tool) breaks
when a disk format is not specified:

$ virt-filesystems -a /mnt/ssd1/VMs/win11.qcow2
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x56112a90d9e0, program = virt-filesystems
libguestfs: trace: add_drive "/mnt/ssd1/VMs/win11.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/libguestfsLWJ0gj/overlay1.qcow2" "qcow2" -1 "backingfile:/mnt/ssd1/VMs/win11.qcow2"
libguestfs: command: run: qemu-img
libguestfs: command: run: \ create
libguestfs: command: run: \ -f qcow2
libguestfs: command: run: \ -o backing_file=/mnt/ssd1/VMs/win11.qcow2
libguestfs: command: run: \ /tmp/libguestfsLWJ0gj/overlay1.qcow2
qemu-img: /tmp/libguestfsLWJ0gj/overlay1.qcow2: Backing file specified without backing format
Detected format of qcow2.libguestfs: error: qemu-img: /tmp/libguestfsLWJ0gj/overlay1.qcow2: qemu-img exited with error status 1, see debug messages above

This is because of a change in qemu:

https://gitlab.com/qemu-project/qemu/-/commit/497a30dbb065937d67f6c43af6dd78492e1d6f6d

I fixed this in libguestfs.  We will need this patch if qemu is
rebased in RHEL 9 (or 8.6?).

Upstream fix:
https://github.com/libguestfs/libguestfs/commit/45de287447bb18d59749fbfc1ec5072413090109
Comment 1 Richard W.M. Jones 2021-08-31 08:00:35 UTC 
QE: To reproduce this you simply need to run "libguestfs-test-tool".
In fact it's likely that gating tests will fail since they run
this command.
Comment 2 YongkuiGuo 2021-08-31 10:47:03 UTC 
I can reproduce this issue on fedora 34 after upgrading the qemu-* related packages to 6.1.0.

# libguestfs-test-tool
PATH=/root/.local/bin:/root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
XDG_RUNTIME_DIR=/run/user/0
SELinux: Enforcing
guestfs_get_append: (null)
guestfs_get_autosync: 1
guestfs_get_backend: libvirt
guestfs_get_backend_settings: []
guestfs_get_cachedir: /var/tmp
guestfs_get_hv: /usr/bin/qemu-kvm
guestfs_get_memsize: 1280
guestfs_get_network: 0
guestfs_get_path: /usr/lib64/guestfs
guestfs_get_pgroup: 0
guestfs_get_program: libguestfs-test-tool
guestfs_get_recovery_proc: 1
guestfs_get_smp: 1
guestfs_get_sockdir: /tmp
guestfs_get_tmpdir: /tmp
guestfs_get_trace: 0
guestfs_get_verbose: 1
host_cpu: x86_64
Launching appliance, timeout set to 600 seconds.
libguestfs: launch: program=libguestfs-test-tool
libguestfs: launch: version=1.45.6fedora=34,release=4.fc34,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=libvirt
libguestfs: launch: tmpdir=/tmp/libguestfsnnQqqL
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: libvirt version = 7000000 (7.0.0)
libguestfs: guest random name = guestfs-6o2kjjbcza35qeap
libguestfs: connect to libvirt
libguestfs: opening libvirt handle: URI = qemu:///system, auth = default+wrapper, flags = 0
libguestfs: successfully opened libvirt handle: conn = 0x55fc440b0030
libguestfs: qemu version (reported by libvirt) = 6001000 (6.1.0)
libguestfs: get libvirt capabilities
libguestfs: parsing capabilities XML
libguestfs: parsing domcapabilities XML
libguestfs: build appliance
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
supermin: version: 5.2.1
supermin: rpm: detected RPM version 4.16
supermin: rpm: detected RPM architecture x86_64
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-0/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: reading the supermin appliance
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: mapping package names to installed packages
supermin: resolving full list of package dependencies
supermin: build: 190 packages, including dependencies
supermin: build: 36385 files
supermin: build: 8237 files, after matching excludefiles
supermin: build: 8248 files, after adding hostfiles
supermin: build: 8234 files, after removing unreadable files
supermin: build: 8256 files, after munging
supermin: kernel: looking for kernel using environment variables ...
supermin: kernel: looking for kernels in /lib/modules/*/vmlinuz ...
supermin: kernel: picked vmlinuz /lib/modules/5.11.12-300.fc34.x86_64/vmlinuz
supermin: kernel: kernel_version 5.11.12-300.fc34.x86_64
supermin: kernel: modpath /lib/modules/5.11.12-300.fc34.x86_64
supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-0/appliance.d.sjxeu1v4/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: ext2: copying kernel modules
supermin: ext2: creating minimal initrd '/var/tmp/.guestfs-0/appliance.d.sjxeu1v4/initrd'
supermin: ext2: wrote 33 modules to minimal initrd
supermin: renaming /var/tmp/.guestfs-0/appliance.d.sjxeu1v4 to /var/tmp/.guestfs-0/appliance.d
libguestfs: finished building supermin appliance
libguestfs: command: run: qemu-img
libguestfs: command: run: \ create
libguestfs: command: run: \ -f qcow2
libguestfs: command: run: \ -o backing_file=/var/tmp/.guestfs-0/appliance.d/root
libguestfs: command: run: \ /tmp/libguestfsnnQqqL/overlay2.qcow2
qemu-img: /tmp/libguestfsnnQqqL/overlay2.qcow2: Backing file specified without backing format
Detected format of raw.libguestfs: error: qemu-img: /tmp/libguestfsnnQqqL/overlay2.qcow2: qemu-img exited with error status 1, see debug messages above
libguestfs: closing guestfs handle 0x55fc440aa660 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfsnnQqqL
Comment 5 YongkuiGuo 2021-09-16 02:58:12 UTC 
I am ready to verify this bug, but I found that I can 'not' reproduce this issue with previous libguestfs package on RHEL9. 

Test with packages:
libguestfs-1.45.6-13.el9
qemu-img-6.1.0-1.el9.x86_64


Steps:

1. On RHEL9 bare metal with RHEL-9.0.0-20210914.1 compose

$ sudo qemu-img create -f qcow2 -o backing_file=rhel-guest-image-9.0-1316.x86_64.qcow2 tmp.qcow2
qemu-img: tmp.qcow2: Backing file specified without backing format
Detected format of qcow2.

It is expected from qemu 6.1.0.

2.

$ sudo qemu-img create -f qcow2 -o backing_file=rhel-guest-image-9.0-1316.x86_64.qcow2,backing_fmt=qcow2 tmp.qcow2
Formatting 'tmp.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=10737418240 backing_file=rhel-guest-image-9.0-1316.x86_64.qcow2 backing_fmt=qcow2 lazy_refcounts=off refcount_bits=16

It works when the format of the backing file is specified.

3.

$ libguestfs-test-tool
...
libguestfs: launch: program=libguestfs-test-tool
libguestfs: launch: version=1.45.6rhel=9,release=13.el9,libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: unix
libguestfs: launch: backend=libvirt
libguestfs: launch: tmpdir=/tmp/libguestfsZlCpSC
libguestfs: launch: umask=0002
libguestfs: launch: euid=1002
libguestfs: libvirt version = 7006000 (7.6.0)
libguestfs: guest random name = guestfs-zbx0wr9ks6slyjt7
libguestfs: connect to libvirt
libguestfs: opening libvirt handle: URI = qemu:///session, auth = default+wrapper, flags = 0
libguestfs: successfully opened libvirt handle: conn = 0x55b3f9819030
libguestfs: qemu version (reported by libvirt) = 6001000 (6.1.0)
libguestfs: get libvirt capabilities
libguestfs: parsing capabilities XML
libguestfs: parsing domcapabilities XML
libguestfs: build appliance
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-1002/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-1002/appliance.d
supermin: version: 5.2.1
supermin: rpm: detected RPM version 4.16
supermin: rpm: detected RPM architecture x86_64
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-1002/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: reading the supermin appliance
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: mapping package names to installed packages
supermin: resolving full list of package dependencies
supermin: build: 176 packages, including dependencies
supermin: build: 34612 files
supermin: build: 8003 files, after matching excludefiles
supermin: build: 8016 files, after adding hostfiles
supermin: build: 8003 files, after removing unreadable files
supermin: build: 8029 files, after munging
supermin: kernel: looking for kernel using environment variables ...
supermin: kernel: looking for kernels in /lib/modules/*/vmlinuz ...
supermin: kernel: picked vmlinuz /lib/modules/5.14.0-1.el9.x86_64/vmlinuz
supermin: kernel: kernel_version 5.14.0-1.el9.x86_64
supermin: kernel: modpath /lib/modules/5.14.0-1.el9.x86_64
supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-1002/appliance.d.twe2e0wr/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: warning: /usr/libexec/utempter/utempter: Permission denied (ignored)
Some distro files are not public readable, so supermin cannot copy them
into the appliance.  This is a problem with your Linux distro.  Please ask
your distro to stop doing pointless security by obscurity.
You can ignore these warnings.  You *do not* need to use sudo.
supermin: warning: /usr/sbin/unix_update: Permission denied (ignored)
supermin: warning: /var/lib/systemd/random-seed: Permission denied (ignored)
supermin: ext2: copying kernel modules
supermin: warning: /lib/modules/5.14.0-1.el9.x86_64/System.map: Permission denied (ignored)
supermin: ext2: creating minimal initrd '/var/tmp/.guestfs-1002/appliance.d.twe2e0wr/initrd'
supermin: ext2: wrote 37 modules to minimal initrd
supermin: renaming /var/tmp/.guestfs-1002/appliance.d.twe2e0wr to /var/tmp/.guestfs-1002/appliance.d
libguestfs: finished building supermin appliance
libguestfs: command: run: qemu-img
libguestfs: command: run: \ create
libguestfs: command: run: \ -f qcow2
libguestfs: command: run: \ -o backing_file=/var/tmp/.guestfs-1002/appliance.d/root,backing_fmt=raw
libguestfs: command: run: \ /tmp/libguestfsZlCpSC/overlay2.qcow2
Formatting '/tmp/libguestfsZlCpSC/overlay2.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=4294967296 backing_file=/var/tmp/.guestfs-1002/appliance.d/root backing_fmt=raw lazy_refcounts=off refcount_bits=16
...
===== TEST FINISHED OK =====

See the above output, the 'backing_fmt=raw' is added in qemu-img command. rjones, could you help look into it? Thanks.
Comment 6 Richard W.M. Jones 2021-09-16 08:17:47 UTC 
The reason is because Fedora (only) uses:

./configure --enable-appliance-format-auto

This causes APPLIANCE_FORMAT_AUTO to be defined.

This causes the following path to be taken in the code:

https://github.com/libguestfs/libguestfs/blob/f47e0bb6725434778384cf79ba3b08610f8c3796/lib/launch-libvirt.c#L500

The reason for setting this in Fedora was because of bug 1967166
which is (another) workaround for containers being broken.

We don't have that change in RHEL which means this probably
wasn't broken in RHEL, but it's good to have the patch anyway.
Comment 7 YongkuiGuo 2021-09-16 09:04:33 UTC 
(In reply to Richard W.M. Jones from comment #6)
> The reason is because Fedora (only) uses:
> 
> ./configure --enable-appliance-format-auto
> 
> This causes APPLIANCE_FORMAT_AUTO to be defined.
> 
> This causes the following path to be taken in the code:
> 
> https://github.com/libguestfs/libguestfs/blob/
> f47e0bb6725434778384cf79ba3b08610f8c3796/lib/launch-libvirt.c#L500
> 
> The reason for setting this in Fedora was because of bug 1967166
> which is (another) workaround for containers being broken.
> 
> We don't have that change in RHEL which means this probably
> wasn't broken in RHEL, but it's good to have the patch anyway.

Got it. Thanks a lot.
Comment 8 YongkuiGuo 2021-09-17 02:55:42 UTC 
Verified with packages:
libguestfs-1.45.6-14.el9
qemu-kvm-6.1.0-1.el9


Steps:

1. On RHEL9 bare metal with RHEL-9.0.0-20210914.1 compose

$ libguestfs-test-tool
...
Launching appliance, timeout set to 600 seconds.
libguestfs: launch: program=libguestfs-test-tool
libguestfs: launch: version=1.45.6rhel=9,release=14.el9,libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: unix
libguestfs: launch: backend=libvirt
libguestfs: launch: tmpdir=/tmp/libguestfshWmNDI
libguestfs: launch: umask=0002
libguestfs: launch: euid=1002
libguestfs: libvirt version = 7006000 (7.6.0)
libguestfs: guest random name = guestfs-wkuugt5932y5hfea
libguestfs: connect to libvirt
libguestfs: opening libvirt handle: URI = qemu:///session, auth = default+wrapper, flags = 0
libguestfs: successfully opened libvirt handle: conn = 0x557e02b40030
libguestfs: qemu version (reported by libvirt) = 6001000 (6.1.0)
libguestfs: get libvirt capabilities
libguestfs: parsing capabilities XML
libguestfs: parsing domcapabilities XML
libguestfs: build appliance
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-1002/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-1002/appliance.d
supermin: version: 5.2.1
supermin: rpm: detected RPM version 4.16
supermin: rpm: detected RPM architecture x86_64
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-1002/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: reading the supermin appliance
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: mapping package names to installed packages
supermin: resolving full list of package dependencies
supermin: build: 176 packages, including dependencies
supermin: build: 34612 files
supermin: build: 8003 files, after matching excludefiles
supermin: build: 8016 files, after adding hostfiles
supermin: build: 8003 files, after removing unreadable files
supermin: build: 8029 files, after munging
supermin: kernel: looking for kernel using environment variables ...
supermin: kernel: looking for kernels in /lib/modules/*/vmlinuz ...
supermin: kernel: picked vmlinuz /lib/modules/5.14.0-1.el9.x86_64/vmlinuz
supermin: kernel: kernel_version 5.14.0-1.el9.x86_64
supermin: kernel: modpath /lib/modules/5.14.0-1.el9.x86_64
supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-1002/appliance.d.3742fvkg/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: warning: /usr/libexec/utempter/utempter: Permission denied (ignored)
Some distro files are not public readable, so supermin cannot copy them
into the appliance.  This is a problem with your Linux distro.  Please ask
your distro to stop doing pointless security by obscurity.
You can ignore these warnings.  You *do not* need to use sudo.
supermin: warning: /usr/sbin/unix_update: Permission denied (ignored)
supermin: warning: /var/lib/systemd/random-seed: Permission denied (ignored)
supermin: ext2: copying kernel modules
supermin: warning: /lib/modules/5.14.0-1.el9.x86_64/System.map: Permission denied (ignored)
supermin: ext2: creating minimal initrd '/var/tmp/.guestfs-1002/appliance.d.3742fvkg/initrd'
supermin: ext2: wrote 37 modules to minimal initrd
supermin: renaming /var/tmp/.guestfs-1002/appliance.d.3742fvkg to /var/tmp/.guestfs-1002/appliance.d
libguestfs: finished building supermin appliance
libguestfs: command: run: qemu-img
libguestfs: command: run: \ create
libguestfs: command: run: \ -f qcow2
libguestfs: command: run: \ -o backing_file=/var/tmp/.guestfs-1002/appliance.d/root,backing_fmt=raw
libguestfs: command: run: \ /tmp/libguestfshWmNDI/overlay2.qcow2
Formatting '/tmp/libguestfshWmNDI/overlay2.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=4294967296 backing_file=/var/tmp/.guestfs-1002/appliance.d/root backing_fmt=raw lazy_refcounts=off refcount_bits=16
libguestfs: create libvirt XML
libguestfs: libvirt XML:\n<?xml version="1.0"?>\n<domain type="kvm" xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0">\n  <name>guestfs-wkuugt5932y5hfea</name>\n  <memory unit="MiB">1280</memory>\n  <currentMemory unit="MiB">1280</currentMemory>\n  <cpu mode="maximum"/>\n  <vcpu>1</vcpu>\n  <clock offset="utc">\n    <timer name="rtc" tickpolicy="catchup"/>\n    <timer name="pit" tickpolicy="delay"/>\n    <timer name="hpet" present="no"/>\n  </clock>\n  <os>\n    <type>hvm</type>\n    <kernel>/var/tmp/.guestfs-1002/appliance.d/kernel</kernel>\n    <initrd>/var/tmp/.guestfs-1002/appliance.d/initrd</initrd>\n    <cmdline>panic=1 console=ttyS0 edd=off udevtimeout=6000 udev.event-timeout=6000 no_timer_check printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests tsc=reliable 8250.nr_uarts=1 root=UUID=0a0c723b-25c3-4a54-93de-9549747b63a0 selinux=0 guestfs_verbose=1 TERM=xterm-256color</cmdline>\n    <bios useserial="yes"/>\n  </os>\n  <on_reboot>destroy</on_reboot>\n  <devices>\n    <rng model="virtio">\n      <backend model="random">/dev/urandom</backend>\n    </rng>\n    <controller type="scsi" index="0" model="virtio-scsi"/>\n    <disk device="disk" type="file">\n      <source file="/tmp/libguestfshWmNDI/scratch1.img"/>\n      <target dev="sda" bus="scsi"/>\n      <driver name="qemu" type="raw" cache="unsafe"/>\n      <address type="drive" controller="0" bus="0" target="0" unit="0"/>\n    </disk>\n    <disk type="file" device="disk">\n      <source file="/tmp/libguestfshWmNDI/overlay2.qcow2"/>\n      <target dev="sdb" bus="scsi"/>\n      <driver name="qemu" type="qcow2" cache="unsafe"/>\n      <address type="drive" controller="0" bus="0" target="1" unit="0"/>\n    </disk>\n    <serial type="unix">\n      <source mode="connect" path="/run/user/0/libguestfsW9y8LT/console.sock"/>\n      <target port="0"/>\n    </serial>\n    <channel type="unix">\n      <source mode="connect" path="/run/user/0/libguestfsW9y8LT/guestfsd.sock"/>\n      <target type="virtio" name="org.libguestfs.channel.0"/>\n    </channel>\n    <controller type="usb" model="none"/>\n    <memballoon model="none"/>\n  </devices>\n  <qemu:commandline>\n    <qemu:env name="TMPDIR" value="/var/tmp"/>\n  </qemu:commandline>\n</domain>\n
...
===== TEST FINISHED OK =====

Combined with comment 6, verified this bug.
Comment 10 errata-xmlrpc 2022-05-17 12:28:37 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: libguestfs), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2317