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This is not the same problem as SERVER-51281, but it does have the same symptoms. It's a system-wide stall where all threads are stuck in cache eviction. SERVER-51281 was caused by the fact that we were using multiple WT sessions on the same thread, as described more generally by SERVER-61116.
This ticket does not describe a full stall that grinds the system to a halt. The system is still making progress, just very slowly. There are a set of problems that culminate in this behavior. Firstly, once operations are stuck inside WiredTiger, we can't kill them. The other problem is our load-shedding in this state is very limited.
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