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Add 5 TDC tests that exercise the reentrant enqueue behaviour in drr, ets, qfq, and hfsc: - Test DRR's enqueue reentrant behaviour with netem (which caused a double list add) - Test ETS's enqueue reentrant behaviour with netem (which caused a double list add) - Test QFQ's enqueue reentrant behaviour with netem (which caused a double list add) - Test HFSC's enqueue reentrant behaviour with netem (which caused a UAF) - Test nested DRR's enqueue reentrant behaviour with netem (which caused a double list add) Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Victor Nogueira <victor@mojatatu.com> Link: https://patch.msgid.link/20250425220710.3964791-6-victor@mojatatu.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>