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This test occasionally fails with a difference in "pg_xact/0000" file between the local and restored datadirs. My hypothesis is that something changed in the database between the last explicit checkpoint and the shutdown. I suspect autovacuum, it could certainly create transactions. To fix, be more precise about the point in time that we compare. Shut down the endpoint first, then read the last LSN (i.e. the shutdown checkpoint's LSN), from the local disk with pg_controldata. And use exactly that LSN in the basebackup. Closes #559. I'm proposing this as an alternative to https://github.com/neondatabase/neon/pull/6662.