Hi. I am currently debugging an issue with libguestfs in Centos 7.2 (Kernel 3.10.0-327.36.3.el7.x86_64). libguestfs is being called by SaltStack to access a qcow2 image, but it is failing. I have narrowed the issue down to the command below: guestmount -i -a /opt/vm-spinning/salt-mnt/salt-images/pb123/system.qcow2 --rw /tmp/guest/opt.vm-spinning.salt-mnt.salt-images.pb123.system.qcow2 I have run libguestfs-test-tool in debug as recommended in the faq but am at a loss to explain the behavior, Libguestfs-test-tool dumps out when I run the guestmount. Please see log below: 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=/root/perl5/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/libguestfs7oWVq5/scratch.1" "raw" 104857600 libguestfs: trace: disk_create = 0 libguestfs: trace: add_drive "/tmp/libguestfs7oWVq5/scratch.1" "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_direct libguestfs: trace: get_direct = 0 guestfs_get_direct: 0 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_selinux libguestfs: trace: get_selinux = 0 guestfs_get_selinux: 0 libguestfs: trace: get_smp libguestfs: trace: get_smp = 1 guestfs_get_smp: 1 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: version libguestfs: trace: version = <struct guestfs_version *> libguestfs: trace: get_backend libguestfs: trace: get_backend = "libvirt" libguestfs: launch: program=libguestfs-test-tool libguestfs: launch: version=1.28.1rhel=7,release=1.55.el7.centos.4,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/libguestfs7oWVq5 libguestfs: launch: umask=0022 libguestfs: launch: euid=0 libguestfs: libvirt version = 1002017 (1.2.17) libguestfs: guest random name = guestfs-aooe4wmnlsfs1b60 libguestfs: [00000ms] connect to libvirt libguestfs: opening libvirt handle: URI = qemu:///system, auth = default+wrapper, flags = 0 libguestfs: successfully opened libvirt handle: conn = 0x7feb544f6c30 libguestfs: qemu version (reported by libvirt) = 1005003 (1.5.3) libguestfs: [00002ms] get libvirt capabilities libguestfs: [00008ms] 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: [00008ms] build appliance libguestfs: trace: get_cachedir libguestfs: trace: get_cachedir = "/var/tmp" libguestfs: [00008ms] begin building supermin appliance libguestfs: [00008ms] 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: 5.1.10 supermin: rpm: detected RPM version 4.11 supermin: package handler: fedora/rpm supermin: acquiring lock on /var/tmp/.guestfs-0/lock supermin: build: /usr/lib64/guestfs/supermin.d 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: build: 188 packages, including dependencies supermin: build: 35821 files supermin: build: 22640 files, after removing unreadable files supermin: build: 13906 files, after matching excludefiles supermin: build: 13911 files, after adding hostfiles supermin: build: 13947 files, after munging supermin: kernel: picked kernel vmlinuz-3.10.0-327.36.3.el7.x86_64 supermin: kernel: picked modules path /lib/modules/3.10.0-327.36.3.el7.x86_64 supermin: kernel: kernel_version 3.10.0-327.36.3.el7.x86_64 supermin: kernel: modules /lib/modules/3.10.0-327.36.3.el7.x86_64 supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-0/appliance.d.o5v90gm5/root' supermin: ext2: populating from base image supermin: ext2: copying files from host filesystem supermin5: ext2fs-c.c:584: ext2_copy_file: Assertion `n == 1 || dest[n-1] != '/'' failed. libguestfs: error: /usr/bin/supermin5 killed by signal 6 (Aborted), see debug messages above libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL: Invalid argument [you can ignore this UNLESS using SELinux + sVirt] libguestfs: trace: launch = -1 (error) libguestfs-test-tool: failed to launch appliance libguestfs: trace: close libguestfs: closing guestfs handle 0x7feb544f6430 (state 0) libguestfs: command: run: rm libguestfs: command: run: \ -rf /tmp/libguestfs7oWVq5