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Add task kptr tests that keep RCU protection active after a spin or RCU unlock when preemption or IRQs remain disabled. Also test the reverse order with explicit RCU. Verify that task kptrs are rejected after leaving the final preemption-disabled or IRQ-disabled region. Signed-off-by: Ning Ding <dingning04@gmail.com> Link: https://lore.kernel.org/bpf/20260805233940.3966981-3-dingning04@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>