What were you trying to do that didn't work?

[libguestfs] [aarch64] libguestfs-test-tool failed with LIBGUESTFS_BACKEND=direct

What is the impact of this issue to you?

Gating test fail

Please provide the package NVR for which the bug is seen:

libguestfs-1.57.4-1.el10.aarch64

qemu-kvm-common-10.0.0-14.el10_1.aarch64
qemu-kvm-core-10.0.0-14.el10_1.aarch64

How reproducible is this bug?:

100%

Steps to reproduce

1. Prepare a aarch64 RHEL10.2 environment 

2. # LIBGUESTFS_BACKEND=direct libguestfs-test-tool
        ************************************************************
        *                    IMPORTANT NOTICE
        *
        * When reporting bugs, include the COMPLETE, UNEDITED
        * output below in your bug report.
        *
        ************************************************************
   LIBGUESTFS_BACKEND=direct
   PATH=/root/.local/bin:/root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
   XDG_RUNTIME_DIR=/run/user/0
   SELinux: Permissive
   guestfs_get_append: (null)
   guestfs_get_autosync: 1
   guestfs_get_backend: direct
   guestfs_get_backend_settings: []
   guestfs_get_cachedir: /var/tmp
   guestfs_get_hv: /usr/libexec/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: aarch64
   Launching appliance, timeout set to 600 seconds.
   libguestfs: launch: program=libguestfs-test-tool
   libguestfs: launch: version=1.57.4rhel=10,release=1.el10,libvirt
   libguestfs: launch: backend registered: direct
   libguestfs: launch: backend registered: libvirt
   libguestfs: launch: backend=direct
   libguestfs: launch: tmpdir=/tmp/libguestfsd0rs0y
   libguestfs: launch: umask=0022
   libguestfs: launch: euid=0
   libguestfs: launch: host: Linux ampere-mtsnow-altramax-45.khw.eng.rdu2.dc.redhat.com 6.12.0-139.el10.aarch64 #1 SMP PREEMPT_DYNAMIC Wed Oct  8 12:39:01 UTC 2025 aarch64
   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 aarch64
   libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
   libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
   supermin: version: 5.3.5
   supermin: rpm: detected RPM version 4.19
   supermin: rpm: detected RPM architecture aarch64
   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: begin testing qemu features
   libguestfs: command: run: /usr/libexec/qemu-kvm
   libguestfs: command: run: \ -version
   libguestfs: qemu: QEMU emulator version 10.0.0 (qemu-kvm-10.0.0-14.el10_1)
   libguestfs: qemu: Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers
   libguestfs: command: run: echo '{ "execute": "qmp_capabilities" }' '{ "execute": "query-kvm" }' '{ "execute": "quit" }'  | QEMU_AUDIO_DRV=none "/usr/libexec/qemu-kvm" -display none -machine "virt,accel=kvm:hvf:tcg" -qmp stdio
   libguestfs: did not understand QMP monitor output from /usr/libexec/qemu-kvm
   libguestfs: closing guestfs handle 0xaaaae0d6e940 (state 0)
   libguestfs: command: run: rm
   libguestfs: command: run: \ -rf /tmp/libguestfsd0rs0y

Expected results

PASS

Actual results

FAIL. 

No errors for :

LIBGUESTFS_BACKEND=libvirt libguestfs-test-tool

LIBGUESTFS_BACKEND_SETTINGS=force_tcg libguestfs-test-tool

No errors on x86_64 & s390x.