Segment 73

In this sub-session, the assistant addressed three production stability issues. First, after verifying that a full co-restart of prefill, decode, and router services resolved a silent PD transfer wedge caused by decode-only restarts, the assistant established operational guidance to always co-restart the PD pair. Second, when the session-bible multi-agent tool continued to hang, the assistant analyzed a goroutine dump and definitively confirmed a client-side HTTP deadlock where all agents were stuck waiting for an unresponsive LLM API, isolating the bottleneck to the HTTP transport layer. Third, when the ocbrowse harness exhibited hangs after 1-3 rounds, the assistant performed a precise diff of all changes since the last stable state and identified the only variable—SGLANG_SM120_MMA_TARGET_CTAS=512—as the cause, reverting it to restore stability for long-context agentic workloads. The sub-session also reported the culmination of earlier performance and correctness efforts including the bf16 index-K corruption fix and decode throughput improvements.

Three Debugging Journeys: Stabilizing Production PD Transfer, Diagnosing HTTP Deadlocks, and Isolating a Single-Variable Regression 4005 words

Chunks

• The Status Report That Saved a Production System: Stabilizing PD Transfer, Fixing GPU Corruption, and Optimizing Decode Throughput
  2026 words
• The Goroutine That Broke the Case: How a Single Diagnostic Artifact Unlocked a Multi-Agent Deadlock
  4015 words
• The Single Variable: How a Disciplined Diff Isolated a Production Regression in LLM Inference
  4057 words
• Production Stability at Scale: Three Debugging Journeys Through a Distributed LLM Inference System
  2766 words