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The verifier previously accepted a task kptr after the final spin unlock ended its RCU protection in a sleepable program. The pointer could then be used after the task was freed. Add a negative test for that case. Add positive controls showing that the pointer remains valid in a non-sleepable program and while an explicit RCU read-side section is still active. Assisted-by: Codex:gpt-5.6-sol Assisted-by: ChatGPT:GPT-5.6-Pro Signed-off-by: Ning Ding <dingning04@gmail.com> Link: https://lore.kernel.org/bpf/20260803112615.3362122-3-dingning04@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>