Weird misaligned memory allocation depending on deallocation order

[hawkw]

As of 4da32e846cc0638f5a8220b06ae283269d793c90, there's a very weird bug in the heap allocator.

In buddy::test::test_alloc_and_dealloc(), when we deallocate all the 8mB blocks and then the 32mB block, the next allocation is correct. But if we deallocate the 32mB block before we've deallocated all of the 8mB blocks, the next allocation doesn't match the pointer given to us by mem.offset().

This works:

heap.deallocate(block_16_0.unwrap(), 8, 8);
heap.deallocate(block_16_3.unwrap(), 8, 8);
heap.deallocate(block_16_1.unwrap(), 8, 8);
heap.deallocate(block_16_2.unwrap(), 8, 8);

heap.deallocate(block_32_2.unwrap(), 32, 32);

let block_128_0 = heap.allocate(128, 128);
assert_eq!(Some(mem.offset(0)), block_128_0);

But this doesn't:

heap.deallocate(block_16_0.unwrap(), 8, 8);
heap.deallocate(block_16_3.unwrap(), 8, 8);

heap.deallocate(block_32_2.unwrap(), 32, 32);

heap.deallocate(block_16_1.unwrap(), 8, 8);
heap.deallocate(block_16_2.unwrap(), 8, 8);

let block_128_0 = heap.allocate(128, 128);
assert_eq!(Some(mem.offset(0)), block_128_0);

[hawkw]

is this fixed yet?