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More discussion can be found at: https://suse.slack.com/archives/C02D76Y4HLL/p1684200959972229

And for now, I can found some clue on test module:
https://openqa.opensuse.org/tests/3290710/modules/force_scheduled_tasks/steps/1/src

  my $systemd_tasks_cmd = 'echo "Triggering systemd timed service $i"';
    $systemd_tasks_cmd .= ' && systemctl stop $i.timer && systemctl mask $i.timer' unless get_var('SOFTFAIL_BSC1063638');
    $systemd_tasks_cmd .= ' && systemctl start $i';
    assert_script_run(
'for i in $(systemctl list-units --type=timer --state=active --no-legend | sed -e \'s/\(\S\+\)\.timer\s.*/\1/\'); do ' . $systemd_tasks_cmd . '; done', 1000);
    record_soft_failure 'bsc#1063638 - review I/O scheduling parameters of btrfsmaintenance' if (time - $before) > 60 && get_var('SOFTFAIL_BSC1063638');
    # Disable cron jobs on older SLE12 by symlinking them to /bin/true
    if (!get_var('SOFTFAIL_BSC1063638') && script_run("! [ -d /usr/share/btrfsmaintenance/ ]")) {
        assert_script_run('find /usr/share/btrfsmaintenance/ -type f -exec ln -fs /bin/true {} \;', timeout => 300);
    }

These test codes will try to do btrfs qgroup rescan, and then 'yast2 lan' command hang.

http://bassey.arch.nue2.suse.org/tests/24

Test is passed without test module https://openqa.opensuse.org/tests/3290710/modules/force_scheduled_tasks/steps/1/src