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Reproduce the UAF scenario where netem is a child of HFSC and HFSC is configured to use the eltree. In such case, this TDC test would cause the HFSC class to be added to the eltree twice resulting in a UAF. Reviewed-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Link: https://patch.msgid.link/20250522181448.1439717-3-pctammela@mojatatu.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>