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JackDoan
2190900107
A slot that stays single-segment is byte-identical to the packet it was seeded from, but flushSlot re-emitted it via WriteGSO with a seeded pseudo-sum, forcing the kernel to software-checksum up to ~1400B that arrived with a perfectly valid checksum. Keep the borrowed seed packet on the slot (valid until Flush per the Commit contract) and emit it through the plain DATA_VALID path when numSeg is still 1 at flush time. appendPayload and mergeSlots only touch hdrBuf once numSeg >= 2, so the raw bytes are pristine whenever the fast path fires. This is every non-coalesced TCP/UDP packet: request/response flows, many-flow fan-in, and each run's leftover tail. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014ugV2edVqoz3tBvq9J6yWp