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v14 commit1f95181b44and its v13 equivalent caused timing-dependent failures in archive recovery, at restartpoints. The symptom was "invalid magic number 0000 in log segment X, offset 0", "unexpected pageaddr X in log segment Y, offset 0" [X < Y], or an assertion failure. Commit3635a0a35aand predecessors back-patched v15 changes to fix that. This test reproduces the problem probabilistically, typically in less than 1000 iterations of the test. Hence, buildfarm and CI runs would have surfaced enough failures to get attention within a day. Reported-by: Arun Thirupathi <arunth@google.com> Discussion: https://postgr.es/m/20250306193013.36.nmisch@google.com Backpatch-through: 13