Signature

Python suite test_cc02 fails on the eviction scenario:

FAIL: test_cc02.test_cc02.test_cc(eviction)
  File ".../test/suite/test_cc02.py", line 119, in test_cc
    self.assertEqual(obsolete_on_disk, 0)
AssertionError: 1 != 0
Ran 13831 tests in 3775.500s
FAILED (failures=1, skipped=461)

Checkpoint cleanup left one obsolete page on disk when the test expected zero.

Scope

Seen on wiredtiger @ 397a2328, task unit-test on ubuntu2004-release-nonstandalone. 1 BFG instance.

Triage notes

BuildBaron's top suggestion WT-17429 does NOT match: WT-17429 is unit-test-macos Evergreen task-timeout on macos-14-arm64 (failure_type task-timed-out, no test failure captured) — a different variant, task, and failure mode. This is a functional assertion failure in the checkpoint-cleanup obsolete-page accounting. The BuildBaron fault extraction landed on passing test lines because the real failure was buried in a 42k-line unit-test log; the signature was recovered from the task-log tail.