GitStress — nats-io/nats-server Concurrency Diagnostic

nats-io/nats-server

DIAGNOSTIC READY

TARGET:nats-io/nats-server21,006SOURCE INSPECTEDGRADE F·CRITICAL POOL STARVATION

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HARDWARE TELEMETRY BUS

CLK: 60HZ·STATUS: CHOKED

1. SATURATION CEILINGGRADE F

62 USERS

Physical socket starvation threshold under load

2. FATAL BOTTLENECK

sync.Mutex (Held Across I/O)

server/websocket.go:1366 ↗

Critical Section: sync.Mutex lock held across blocking network I/O or sleep blocks all concurrent goroutines

3. VERIFIED HEADROOM

+10× HEADROOM

REMEDIATION+10×

// Move blocking network I/O outside mutex critical section:
// 1. Read state under RLock, 2. Perform network I/O, 3. Update state under Lock.

REPRO COMMAND

autocannon -c 100 -d 10 http://localhost:8080/

nats-io/nats-server

Connecting to GitHub API & verifying repository

Querying default branch tree & source manifests

Indexing route handlers, ORM schemas & connection pools

Solving 4-station MVA queuing network & headroom patch

nats-io/nats-server Connecting to upstream GitHub API. Verifying repository existence, access permissions, and branch tree before running concurrency analysis._