ret.map_or(true,
        |block|
            {
                block.as_ref().header.start_index ==
                    self.header.start_index.wrapping_add(BLOCK_CAP)
            })
}there is no such thing as a relaxed fenceArcs backed by a static should never reach a strong count of 0. Likely decrement_strong_count or from_raw were called too many times.Arc/Weaks backed by a static should never be deallocated. Likely decrement_strong_count or from_raw were called too many times.