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Ryan HuberandClaude Opus 5.5
64bec56404
On darwin, listenIn encrypts into one SendBatch while a sender goroutine writes the other (batch.SendPipeline). The sender takes whatever built up during its last write, so writes overlap tun reads and packets queued behind a write leave in one WriteBatch, which a connected socket sends as one sendmsg_x. Two batches bound memory; a full producer waits for the swap rather than dropping. One producer and one sender keep per-peer order equal to message-counter order. Everywhere else the branch is a false constant and listenIn is unchanged. -tags send_pipeline builds the pipeline on any platform, so its tests and the e2e suite can run through it on linux. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>