If we verify the WiredTiger.wt file, we're leaving pages in the cache. Here's a simple example, using the thread test program, but I suspect this isn't connected to that program in any way.
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bengal:build_posix {41} test/thread/t -1
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t: process 29965
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1: 10 readers, 10 writers
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read thread 0 starting: tid: 0x7fd9ab34f700
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read thread 1 starting: tid: 0x7fd9aa94e700
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read thread 2 starting: tid: 0x7fd9a9f4d700
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read thread 3 starting: tid: 0x7fd9a3fff700
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read thread 4 starting: tid: 0x7fd9a954c700
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read thread 7 starting: tid: 0x7fd9a2bfd700
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read thread 5 starting: tid: 0x7fd9a8b4b700
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read thread 8 starting: tid: 0x7fd9a21fc700
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read thread 9 starting: tid: 0x7fd9a17fb700
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read thread 6 starting: tid: 0x7fd9a35fe700
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write thread 10 starting: tid: 0x7fd9a0dfa700
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write thread 12 starting: tid: 0x7fd98f5fe700
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write thread 11 starting: tid: 0x7fd98ffff700
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write thread 14 starting: tid: 0x7fd98e1fc700
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write thread 15 starting: tid: 0x7fd98d7fb700
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write thread 13 starting: tid: 0x7fd98ebfd700
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write thread 16 starting: tid: 0x7fd98cdfa700
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write thread 17 starting: tid: 0x7fd983fff700
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write thread 19 starting: tid: 0x7fd982bfd700
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write thread 18 starting: tid: 0x7fd9835fe700
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timer: 2.15 seconds (93023 ops/second)
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0: read: 10000, remove: 0, update: 0
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1: read: 10000, remove: 0, update: 0
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2: read: 10000, remove: 0, update: 0
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3: read: 10000, remove: 0, update: 0
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4: read: 10000, remove: 0, update: 0
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5: read: 10000, remove: 0, update: 0
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6: read: 10000, remove: 0, update: 0
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7: read: 10000, remove: 0, update: 0
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8: read: 10000, remove: 0, update: 0
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9: read: 10000, remove: 0, update: 0
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10: read: 0, remove: 2019, update: 7981
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11: read: 0, remove: 2035, update: 7965
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12: read: 0, remove: 2065, update: 7935
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13: read: 0, remove: 1989, update: 8011
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14: read: 0, remove: 1922, update: 8078
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15: read: 0, remove: 2039, update: 7961
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16: read: 0, remove: 1994, update: 8006
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17: read: 0, remove: 2020, update: 7980
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18: read: 0, remove: 1974, update: 8026
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19: read: 0, remove: 2012, update: 7988
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bengal:build_posix {42} ./wt verify file:WiredTiger.wt
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cache server: exiting with 1 pages, 1051 bytes in use
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bengal:build_posix {43}
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