Eviction server handles can deadlock when opening HS cursors

I've been running test_timestamp_abort on my AWS box for several days and after 14000 iterations, I noticed today it had not advanced an iteration since Friday night. The process is still there and therefore it was hung.

The command I am running is ./test_timestamp_abort -C -T 12 -t 10. However given that it took 14000 iterations to hit this, it is unlikely readily reproducible unless the stacks give a hint of a window to widen.