One of the compaction tests is unstable – it occasionally fails to reduce the file size and fails with this message:
Traceback (most recent call last):
File "/home/jenkins/jenkins/workspace/wiredtiger-pull-request-tester/test/suite/test_compact.py", line 97, in test_compact
self.assertLess(stat_cursor[stat.dsrc.btree_row_leaf][2], self.maxpages)
AssertionError: 30 not less than 30
Presumably there is some interaction with eviction, because the test should be otherwise deterministic.