Debugging Entry Points and Common Issues — Forge College

Struggling to track panics or silent logic errors in Solana program entry points? Debugging entry points is the bridge between implementation and reliable on-chain behavior — learn how to find, reproduce, and fix the most common faults. What you'll learn In this lesson you will practice interpreting unit-test failures and runtime backtraces to locate the exact line-level causes of panics or incorrect behavior. You'll reproduce failures locally using focused unit and integration tests that isolate entry-point inputs and environment, then apply a test-driven workflow: add a failing test, implement a minimal fix, and expand tests to cover edge cases. Two concrete issues are exercised: an off-by-one parameter parsing bug that triggers array indexing panics, and a boolean validation inversion that causes silent early-returns and skipped state updates. You will produce a concise debug report documenting reproductions, root-cause analysis, fixes, and updated test results. Who this is for Intermediate Rust/Solana developers who already know the basics of the Rust toolchain and Solana program structure and want to level up debugging, testing, and regression-proofing skills. Key topics covered - Reading and interpreting logs, backtraces, and failing test output to narrow fault lines - Reproducing failures in isolation with unit and integration-style harnesses - Test-driven debugging: add failing tests, implement minimal fixes, and expand coverage - Fixing an off-by-one parameter parsing bug that causes array panics - Fixing a boolean validation inversion that leads to silent early returns - Writing a structured debug report and creating regression tests Hands-on steps you will use include inspecting src/entry.rs and tests/entry_tests.rs, running rustup show active-toolchain && cargo build, and executing cargo test -- --nocapture to gather failing traces. Create a feature branch for fixes (for example: git checkout -b debug-entrypoints) so your fixes and debug report are isolated and traceable. Ready to practice the lab and build reproducible debugging habits? Start now: https://www.forge.college/