Flutter CLI Stuck / Hangs / Invalid SDK Hash — Diagnosis & Fix

When to Use

Use this skill when:

• flutter pub get, flutter build, flutter run, or ANY Flutter CLI command hangs indefinitely (no output for > 30 seconds)
• You see Can't load Kernel binary: Invalid SDK hash error
• fvm flutter commands produce zero output
• Flutter commands were working before but suddenly stopped

Root Cause Checklist

Work through these in order — each step resolves a progressively deeper issue.

1. 🧟 Zombie dart.exe / java.exe Processes (Most Common)

Symptoms: Flutter command shows no output, or hangs at "Resolving dependencies..."