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rhel-9 flakes with "libguestfs: error: appliance closed the connection unexpectedly" #1657

Description

@rvykydal

https://redhat.atlassian.net/browse/INSTALLER-4721

First hit Tue Apr 28 in https://github.com/rhinstaller/kickstart-tests/actions/runs/25026051511

4 flakes:

default-systemd-target-tui
initial-setup-gui
raid-luks-1
raid-luks-2
2026-04-28 02:09:31,240 DEBUG: Failed to run subprocess: '['/opt/kstest/kickstart-tests/scripts/launcher/lib/launcher_interface.sh', '-i', '/opt/kstest/data/images/boot.iso', '-k', '1', '-w', '/var/tmp/kstest-default-systemd-target-tui.2026_04_28-01_58_30.73ion7ak', '-t', '/opt/kstest/kickstart-tests/default-systemd-target-tui.sh', 'validate']'
stderr:
libguestfs: error: appliance closed the connection unexpectedly.
This usually means the libguestfs appliance crashed.
Do:
  export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1
and run the command again.  For further information, read:
  http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
You can also run 'libguestfs-test-tool' and post the *complete* output
into a bug report or message to the libguestfs mailing list.
libguestfs: error: guestfs_launch failed.
This usually means the libguestfs appliance failed to start or crashed.
Do:
  export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1
and run the command again.  For further information, read:
  http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
You can also run 'libguestfs-test-tool' and post the *complete* output
into a bug report or message to the libguestfs mailing list.
egrep: warning: egrep is obsolescent; using grep -E
grep: /var/tmp/kstest-default-systemd-target-tui.2026_04_28-01_58_30.73ion7ak/anaconda-ks.cfg: No such file or directory
stdout:
*** skipx command not present in output kickstart

2026-04-28 02:09:31,240 INFO: RESULT:default-systemd-target-tui:70733a16c733:FAILED:Validation failed with return code 1

kstest.log
virt-install.log

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    priority: highIssues with the highest priority.test flakeA test flake worth tracking (for more investigation, potenital bug, or to see if more come...)

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