`SendStream.send_all()` can raise `trio.Cancelled` after writing an arbitrary prefix of the four-byte length header and payload. The peer can no longer distinguish a following msg boundary. Close the stream under a shield before propagating cancellation so callers can not append another msg to an indeterminate byte stream. Caught-during: review remediation Found-via: prospective P2 cancellation review Review: PR #481 (opencode) https://github.com/goodboy/tractor/pull/481#pullrequestreview-4956692120 Prompt-IO: ai/prompt-io/opencode/20260818T193001Z_bf06b4f8_prompt_io.md (this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`)) |
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