Note: this may be the same underlying issue as SERVER-25974, but some of the metrics appear to be different, and this ticket has a specific simple repro not clearly tied to the customer issue seen on SERVER-25974, so opening as a separate ticket for now until/unless we can demonstrate that they are the same issue.

The insert repro workload from SERVER-20306, also attached to this ticket as repro-32-insert.sh, gets stuck with cache utilization at about 96%:

• problems start at A, pretty much complete stuck at B
• ftdc stalls ("ftdc samples/s") suggest that application threads are sometimes getting stuck for extended periods doing evictions
• application threads seem to be starved for work to do:
  • "pages walked for eviction" has gone up but "pages seen by eviction walks" has gone down
  • application threads are often finding the queue empty
  • pages evicted by application threads is not high

I've also attached stack traces captured during the stuck period, although I don't think they give much insight.