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Parallel VACUUM relied on global variable state from the leader process being propagated to workers on fork(). Commit b4af70cb removed most uses of global variables inside vacuumlazy.c, but did not account for the buffer access strategy state. To fix, propagate the state through shared memory instead. Per buildfarm failures on elver, curculio, and morepork. Many thanks to Thomas Munro for off-list assistance with this issue.