Could some give an illustration of the following sentence?

In fact, for every purported consensus protocol that guarantees agreement and validity, there is some execution in which there are no failures and yet the algorithm never terminates.

Source: http://ieeexplore.ieee.org/xpl/login.jsp?arnumber=6122006&tp=&url=http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber%3D6122006

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    $\begingroup$ Welcome to CS.SE! We expect references to fulfill the minimal scholarly requirements and be as robust over time as possible. Can you edit your post to provide a full citation (title, authors, where published, and a link to a freely available PDF if you know of one), so others with a similar question can find this by searching on the title of the paper? We have collected some advice here. Thank you! $\endgroup$ – D.W. Mar 8 at 18:51

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