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aligned_alloc() is used by testsc for all its memory allocation, to avoid false-positive timing variations that depend on memory alignment rather than actual secret data. But I'd forgotten that aligned_alloc requires the allocation size to be a multiple of the requested alignment. This showed up when I ran testsc in dry-run mode, and my normal build happened to be using ASan, which complains at the invalid allocation size. But it was theoretically a problem in all builds of testsc. (Though, as far as I'm aware, not practically; and it _only_ affected testsc.)