2noise/ChatTTS · error · ValueError

Double free! {block} is already freed.

Error message

Double free! {block} is already freed.

What it means

Error "Double free! {block} is already freed." thrown in 2noise/ChatTTS.

Source

Thrown at ChatTTS/model/velocity/block_manager.py:49

        # Initialize the free blocks.
        self.free_blocks: BlockTable = []
        for i in range(num_blocks):
            block = PhysicalTokenBlock(
                device=device, block_number=i, block_size=block_size
            )
            self.free_blocks.append(block)

    def allocate(self) -> PhysicalTokenBlock:
        if not self.free_blocks:
            raise ValueError("Out of memory! No free blocks are available.")
        block = self.free_blocks.pop()
        block.ref_count = 1
        return block

    def free(self, block: PhysicalTokenBlock) -> None:
        if block.ref_count == 0:
            raise ValueError(f"Double free! {block} is already freed.")
        block.ref_count -= 1
        if block.ref_count == 0:
            self.free_blocks.append(block)

    def get_num_free_blocks(self) -> int:
        return len(self.free_blocks)


class AllocStatus(enum.Enum):
    """Result for BlockSpaceManager.can_allocate

    1. Ok: seq_group can be allocated now.
    2. Later: seq_group cannot be allocated.
      The capacity of allocator is larger than seq_group required.
    3. Never: seq_group can never be allocated.
      The seq_group is too large to allocated in GPU.
    """

View on GitHub (pinned to 77b89ee281)

When it happens

Trigger: Thrown at ChatTTS/model/velocity/block_manager.py:49 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of 2noise/ChatTTS@77b89ee281 (2026-08-26). Data as JSON: /api/errors/ea257d045f6b5c09. Report an issue: GitHub.