It seems that the appliance is broken. Try removing /var/tmp/.guestfs-0/
and run the test tool again.
    Tomas
On Fri, 3 Jan 2020 13:53:10 +0800
"谢威" <249016681(a)qq.com> wrote:
 Hi,
     I have use  kvm 、 virsh 、 virt   for
almost half year ,all things goes well 。
     but recently, I use virt-copy-in  found some problem ,
I  have   do  nothing  with my
server  ,but the problem appear . 
      
     
     Here is the error message blow .  I really
appreciate your geneous help
 
 
 
 
 
 
 
 
 [root@gz-op-vmhost01 vmdata]# uname  -r && cat
/etc/redhat-release  && virsh -V
 4.19.8-1.el7.elrepo.x86_64
 CentOS Linux release 7.2.1511 (Core)
 Virsh command line tool of libvirt 4.5.0
 See web site at 
https://libvirt.org/
 
 
 Compiled with support for:
  Hypervisors: QEMU/KVM LXC ESX Test
  Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort
  Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Gluster
  Miscellaneous: Daemon Nodedev SELinux Secrets Debug DTrace Readline
 
 
 
 
 
 
 
 [root@gz-op-vmhost01 vmdata]#  libguestfs-test-tool
    
 ************************************************************
      *         
          IMPORTANT NOTICE
      *
      * When reporting bugs, include the COMPLETE, UNEDITED
      * output below in your bug report.
      *
    
 ************************************************************
 libguestfs: trace: set_verbose true
 libguestfs: trace: set_verbose = 0
 libguestfs: trace: set_verbose true
 libguestfs: trace: set_verbose = 0
 LIBGUESTFS_DEBUG=1
 LIBGUESTFS_TRACE=1
PATH=/usr/java/jdk1.8.0_151/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
 SELinux: Disabled
 libguestfs: trace: add_drive_scratch 104857600
 libguestfs: trace: get_tmpdir
 libguestfs: trace: get_tmpdir = "/tmp"
 libguestfs: trace: disk_create "/tmp/libguestfsr2XJRP/scratch1.img"
"raw" 104857600
 libguestfs: trace: disk_create = 0
 libguestfs: trace: add_drive "/tmp/libguestfsr2XJRP/scratch1.img"
"format:raw" "cachemode:unsafe"
 libguestfs: trace: add_drive = 0
 libguestfs: trace: add_drive_scratch = 0
 libguestfs: trace: get_append
 libguestfs: trace: get_append = "NULL"
 guestfs_get_append: (null)
 libguestfs: trace: get_autosync
 libguestfs: trace: get_autosync = 1
 guestfs_get_autosync: 1
 libguestfs: trace: get_backend
 libguestfs: trace: get_backend = "libvirt"
 guestfs_get_backend: libvirt
 libguestfs: trace: get_backend_settings
 libguestfs: trace: get_backend_settings = []
 guestfs_get_backend_settings: []
 libguestfs: trace: get_cachedir
 libguestfs: trace: get_cachedir = "/var/tmp"
 guestfs_get_cachedir: /var/tmp
 libguestfs: trace: get_hv
 libguestfs: trace: get_hv = "/usr/libexec/qemu-kvm"
 guestfs_get_hv: /usr/libexec/qemu-kvm
 libguestfs: trace: get_memsize
 libguestfs: trace: get_memsize = 500
 guestfs_get_memsize: 500
 libguestfs: trace: get_network
 libguestfs: trace: get_network = 0
 guestfs_get_network: 0
 libguestfs: trace: get_path
 libguestfs: trace: get_path = "/usr/lib64/guestfs"
 guestfs_get_path: /usr/lib64/guestfs
 libguestfs: trace: get_pgroup
 libguestfs: trace: get_pgroup = 0
 guestfs_get_pgroup: 0
 libguestfs: trace: get_program
 libguestfs: trace: get_program = "libguestfs-test-tool"
 guestfs_get_program: libguestfs-test-tool
 libguestfs: trace: get_recovery_proc
 libguestfs: trace: get_recovery_proc = 1
 guestfs_get_recovery_proc: 1
 libguestfs: trace: get_smp
 libguestfs: trace: get_smp = 1
 guestfs_get_smp: 1
 libguestfs: trace: get_sockdir
 libguestfs: trace: get_sockdir = "/tmp"
 guestfs_get_sockdir: /tmp
 libguestfs: trace: get_tmpdir
 libguestfs: trace: get_tmpdir = "/tmp"
 guestfs_get_tmpdir: /tmp
 libguestfs: trace: get_trace
 libguestfs: trace: get_trace = 1
 guestfs_get_trace: 1
 libguestfs: trace: get_verbose
 libguestfs: trace: get_verbose = 1
 guestfs_get_verbose: 1
 host_cpu: x86_64
 Launching appliance, timeout set to 600 seconds.
 libguestfs: trace: launch
 libguestfs: trace: max_disks
 libguestfs: trace: max_disks = 255
 libguestfs: trace: version
 libguestfs: trace: version = <struct guestfs_version = major: 1, minor: 38, release:
2, extra: rhel=7,release=12.el7_6.2,libvirt, >
 libguestfs: trace: get_backend
 libguestfs: trace: get_backend = "libvirt"
 libguestfs: launch: program=libguestfs-test-tool
 libguestfs: launch: version=1.38.2rhel=7,release=12.el7_6.2,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/libguestfsr2XJRP
 libguestfs: launch: umask=0022
 libguestfs: launch: euid=0
 libguestfs: libvirt version = 4005000 (4.5.0)
 libguestfs: guest random name = guestfs-tv134tqwpax481b9
 libguestfs: connect to libvirt
 libguestfs: opening libvirt handle: URI = qemu:///system, auth = default+wrapper, flags =
0
 libguestfs: successfully opened libvirt handle: conn = 0x564c2ce63ab0
 libguestfs: qemu version (reported by libvirt) = 2012000 (2.12.0)
 libguestfs: get libvirt capabilities
 libguestfs: parsing capabilities XML
 libguestfs: trace: get_backend_setting "force_tcg"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_label"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_imagelabel"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_norelabel_disks"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: build appliance
 libguestfs: trace: get_cachedir
 libguestfs: trace: get_cachedir = "/var/tmp"
 libguestfs: begin building supermin appliance
 libguestfs: run supermin
 libguestfs: command: run: /usr/bin/supermin5
 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: 5.1.19
 supermin: rpm: detected RPM version 4.11
 supermin: package handler: fedora/rpm
 supermin: acquiring lock on /var/tmp/.guestfs-0/lock
 supermin: if-newer: output does not need rebuilding
 libguestfs: finished building supermin appliance
 libguestfs: trace: disk_create "/tmp/libguestfsr2XJRP/overlay2.qcow2"
"qcow2" -1 "backingfile:/var/tmp/.guestfs-0/appliance.d/root"
"backingformat:raw"
 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,backing_fmt=raw
 libguestfs: command: run: \ /tmp/libguestfsr2XJRP/overlay2.qcow2
 qemu-img: /tmp/libguestfsr2XJRP/overlay2.qcow2: Could not open
'/var/tmp/.guestfs-0/appliance.d/root': No such file or directory
 Could not open backing image to determine size.
 libguestfs: error: qemu-img: /tmp/libguestfsr2XJRP/overlay2.qcow2: qemu-img exited with
error status 1, see debug messages above
 libguestfs: trace: disk_create = -1 (error)
 libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL: Invalid argument
[you can ignore this message if you are not using SELinux + sVirt]
 libguestfs: trace: launch = -1 (error)
 libguestfs: trace: close
 libguestfs: closing guestfs handle 0x564c2ce63000 (state 0)
 libguestfs: command: run: rm
 libguestfs: command: run: \ -rf /tmp/libguestfsr2XJRP
 
 
 
 
 
 
 
 
 [root@gz-op-vmhost01 vmdata]# ll /var/tmp/.guestfs-0/appliance.d/root
 ls: cannot access /var/tmp/.guestfs-0/appliance.d/root: No such file or directory
 [root@gz-op-vmhost01 vmdata]# ll /var/tmp/.guestfs-0/appliance.d/
 total 10192
 -rw-r--r-- 1 qemu qemu 3335680 Jan  3 13:36 initrd
 -rwxr-xr-x 1 qemu qemu 7095680 Jan  3 13:36 kernel
 
 
 [root@gz-op-vmhost01 vmdata]# mkdir /var/tmp/.guestfs-0/appliance.d/root
 
 
 
 
 
 
 
 
 
 
 
 
 [root@gz-op-vmhost01 vmdata]#  libguestfs-test-tool
    
 ************************************************************
      *         
          IMPORTANT NOTICE
      *
      * When reporting bugs, include the COMPLETE, UNEDITED
      * output below in your bug report.
      *
    
 ************************************************************
 libguestfs: trace: set_verbose true
 libguestfs: trace: set_verbose = 0
 libguestfs: trace: set_verbose true
 libguestfs: trace: set_verbose = 0
 LIBGUESTFS_DEBUG=1
 LIBGUESTFS_TRACE=1
PATH=/usr/java/jdk1.8.0_151/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
 SELinux: Disabled
 libguestfs: trace: add_drive_scratch 104857600
 libguestfs: trace: get_tmpdir
 libguestfs: trace: get_tmpdir = "/tmp"
 libguestfs: trace: disk_create "/tmp/libguestfsn1zUMm/scratch1.img"
"raw" 104857600
 libguestfs: trace: disk_create = 0
 libguestfs: trace: add_drive "/tmp/libguestfsn1zUMm/scratch1.img"
"format:raw" "cachemode:unsafe"
 libguestfs: trace: add_drive = 0
 libguestfs: trace: add_drive_scratch = 0
 libguestfs: trace: get_append
 libguestfs: trace: get_append = "NULL"
 guestfs_get_append: (null)
 libguestfs: trace: get_autosync
 libguestfs: trace: get_autosync = 1
 guestfs_get_autosync: 1
 libguestfs: trace: get_backend
 libguestfs: trace: get_backend = "libvirt"
 guestfs_get_backend: libvirt
 libguestfs: trace: get_backend_settings
 libguestfs: trace: get_backend_settings = []
 guestfs_get_backend_settings: []
 libguestfs: trace: get_cachedir
 libguestfs: trace: get_cachedir = "/var/tmp"
 guestfs_get_cachedir: /var/tmp
 libguestfs: trace: get_hv
 libguestfs: trace: get_hv = "/usr/libexec/qemu-kvm"
 guestfs_get_hv: /usr/libexec/qemu-kvm
 libguestfs: trace: get_memsize
 libguestfs: trace: get_memsize = 500
 guestfs_get_memsize: 500
 libguestfs: trace: get_network
 libguestfs: trace: get_network = 0
 guestfs_get_network: 0
 libguestfs: trace: get_path
 libguestfs: trace: get_path = "/usr/lib64/guestfs"
 guestfs_get_path: /usr/lib64/guestfs
 libguestfs: trace: get_pgroup
 libguestfs: trace: get_pgroup = 0
 guestfs_get_pgroup: 0
 libguestfs: trace: get_program
 libguestfs: trace: get_program = "libguestfs-test-tool"
 guestfs_get_program: libguestfs-test-tool
 libguestfs: trace: get_recovery_proc
 libguestfs: trace: get_recovery_proc = 1
 guestfs_get_recovery_proc: 1
 libguestfs: trace: get_smp
 libguestfs: trace: get_smp = 1
 guestfs_get_smp: 1
 libguestfs: trace: get_sockdir
 libguestfs: trace: get_sockdir = "/tmp"
 guestfs_get_sockdir: /tmp
 libguestfs: trace: get_tmpdir
 libguestfs: trace: get_tmpdir = "/tmp"
 guestfs_get_tmpdir: /tmp
 libguestfs: trace: get_trace
 libguestfs: trace: get_trace = 1
 guestfs_get_trace: 1
 libguestfs: trace: get_verbose
 libguestfs: trace: get_verbose = 1
 guestfs_get_verbose: 1
 host_cpu: x86_64
 Launching appliance, timeout set to 600 seconds.
 libguestfs: trace: launch
 libguestfs: trace: max_disks
 libguestfs: trace: max_disks = 255
 libguestfs: trace: version
 libguestfs: trace: version = <struct guestfs_version = major: 1, minor: 38, release:
2, extra: rhel=7,release=12.el7_6.2,libvirt, >
 libguestfs: trace: get_backend
 libguestfs: trace: get_backend = "libvirt"
 libguestfs: launch: program=libguestfs-test-tool
 libguestfs: launch: version=1.38.2rhel=7,release=12.el7_6.2,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/libguestfsn1zUMm
 libguestfs: launch: umask=0022
 libguestfs: launch: euid=0
 libguestfs: libvirt version = 4005000 (4.5.0)
 libguestfs: guest random name = guestfs-6jipufmlo60389k4
 libguestfs: connect to libvirt
 libguestfs: opening libvirt handle: URI = qemu:///system, auth = default+wrapper, flags =
0
 libguestfs: successfully opened libvirt handle: conn = 0x563ac943fab0
 libguestfs: qemu version (reported by libvirt) = 2012000 (2.12.0)
 libguestfs: get libvirt capabilities
 libguestfs: parsing capabilities XML
 libguestfs: trace: get_backend_setting "force_tcg"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_label"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_imagelabel"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_norelabel_disks"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: build appliance
 libguestfs: trace: get_cachedir
 libguestfs: trace: get_cachedir = "/var/tmp"
 libguestfs: begin building supermin appliance
 libguestfs: run supermin
 libguestfs: command: run: /usr/bin/supermin5
 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: 5.1.19
 supermin: rpm: detected RPM version 4.11
 supermin: package handler: fedora/rpm
 supermin: acquiring lock on /var/tmp/.guestfs-0/lock
 supermin: if-newer: output does not need rebuilding
 libguestfs: finished building supermin appliance
 libguestfs: trace: disk_create "/tmp/libguestfsn1zUMm/overlay2.qcow2"
"qcow2" -1 "backingfile:/var/tmp/.guestfs-0/appliance.d/root"
"backingformat:raw"
 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,backing_fmt=raw
 libguestfs: command: run: \ /tmp/libguestfsn1zUMm/overlay2.qcow2
 qemu-img: /tmp/libguestfsn1zUMm/overlay2.qcow2: A regular file was expected by the
'file' driver, but something else was given
 Could not open backing image to determine size.
 libguestfs: error: qemu-img: /tmp/libguestfsn1zUMm/overlay2.qcow2: qemu-img exited with
error status 1, see debug messages above
 libguestfs: trace: disk_create = -1 (error)
 libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL: Invalid argument
[you can ignore this message if you are not using SELinux + sVirt]
 libguestfs: trace: launch = -1 (error)
 libguestfs: trace: close
 libguestfs: closing guestfs handle 0x563ac943f000 (state 0)
 libguestfs: command: run: rm
 libguestfs: command: run: \ -rf /tmp/libguestfsn1zUMm
 [root@gz-op-vmhost01 vmdata]#
 
 
 
 
 
 
 
 
 
 [root@gz-op-vmhost01 vmdata]# virt-copy-in /etc/resolv.conf -a
10.188.2.9.sys.img    /etc/
 libguestfs: trace: set_verbose true
 libguestfs: trace: set_verbose = 0
 libguestfs: create: flags = 0, handle = 0x55f344b7f650, program = virt-copy-in
 libguestfs: trace: set_pgroup true
 libguestfs: trace: set_pgroup = 0
 libguestfs: trace: add_drive "10.188.2.9.sys.img"
 libguestfs: trace: add_drive = 0
 libguestfs: trace: is_config
 libguestfs: trace: is_config = 1
 libguestfs: trace: launch
 libguestfs: trace: max_disks
 libguestfs: trace: max_disks = 255
 libguestfs: trace: get_tmpdir
 libguestfs: trace: get_tmpdir = "/tmp"
 libguestfs: trace: version
 libguestfs: trace: version = <struct guestfs_version = major: 1, minor: 38, release:
2, extra: rhel=7,release=12.el7_6.2,libvirt, >
 libguestfs: trace: get_backend
 libguestfs: trace: get_backend = "libvirt"
 libguestfs: launch: program=virt-copy-in
 libguestfs: launch: version=1.38.2rhel=7,release=12.el7_6.2,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/libguestfsHRQGUn
 libguestfs: launch: umask=0022
 libguestfs: launch: euid=0
 libguestfs: libvirt version = 4005000 (4.5.0)
 libguestfs: guest random name = guestfs-yxto5xhpuo3fwlvw
 libguestfs: connect to libvirt
 libguestfs: opening libvirt handle: URI = qemu:///system, auth = default+wrapper, flags =
0
 libguestfs: successfully opened libvirt handle: conn = 0x55f344b800c0
 libguestfs: qemu version (reported by libvirt) = 2012000 (2.12.0)
 libguestfs: get libvirt capabilities
 libguestfs: parsing capabilities XML
 libguestfs: trace: get_backend_setting "force_tcg"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_label"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_imagelabel"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: trace: get_backend_setting "internal_libvirt_norelabel_disks"
 libguestfs: trace: get_backend_setting = NULL (error)
 libguestfs: build appliance
 libguestfs: trace: get_cachedir
 libguestfs: trace: get_cachedir = "/var/tmp"
 libguestfs: begin building supermin appliance
 libguestfs: run supermin
 libguestfs: command: run: /usr/bin/supermin5
 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: 5.1.19
 supermin: rpm: detected RPM version 4.11
 supermin: package handler: fedora/rpm
 supermin: acquiring lock on /var/tmp/.guestfs-0/lock
 supermin: if-newer: output does not need rebuilding
 libguestfs: finished building supermin appliance
 libguestfs: trace: disk_create "/tmp/libguestfsHRQGUn/overlay1.qcow2"
"qcow2" -1 "backingfile:/var/tmp/.guestfs-0/appliance.d/root"
"backingformat:raw"
 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,backing_fmt=raw
 libguestfs: command: run: \ /tmp/libguestfsHRQGUn/overlay1.qcow2
 qemu-img: /tmp/libguestfsHRQGUn/overlay1.qcow2: A regular file was expected by the
'file' driver, but something else was given
 Could not open backing image to determine size.
 libguestfs: error: qemu-img: /tmp/libguestfsHRQGUn/overlay1.qcow2: qemu-img exited with
error status 1, see debug messages above
 libguestfs: trace: disk_create = -1 (error)
 libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL: Invalid argument
[you can ignore this message if you are not using SELinux + sVirt]
 libguestfs: trace: launch = -1 (error)
 libguestfs: trace: close
 libguestfs: closing guestfs handle 0x55f344b7f650 (state 0)
 libguestfs: command: run: rm
 libguestfs: command: run: \ -rf /tmp/libguestfsHRQGUn