Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
PHP Fatal Error: Uncaught Exception – What It Means and How to Fix It
A PHP Fatal Error: Uncaught Exception crashes your script. This guide explains the causes, how to find the culprit, and how to prevent it.
Laravel Queue Worker Stops Processing Jobs Without Errors
A guide to diagnosing why a Laravel queue worker appears running but never processes jobs, covering timeout, memory, supervisor, and database locks.
Laravel Artisan Command Error: Debugging Common Failures
A focused guide to diagnosing and fixing Laravel Artisan command errors, covering environment issues, memory limits, and missing dependencies.
Cannot Borrow Error: Practical Fixes for Real Code
A hands-on guide to diagnosing and fixing Rust borrow checker errors involving 'cannot borrow' messages, with real-world scenarios and code examples.
Rust Lifetime Error: Does Not Live Long Enough
A guide to debugging Rust's 'does not live long enough' error, covering obscure causes and real-world fixes.
Debugging Rust Async Tokio Runtime Errors: Blocked Tasks and Missing Wakers
When your Tokio-based async application hangs, panics with 'block_on' or 'spawn' failures, or tasks never complete, this guide walks you through diagnosing and fixing runtime errors.
Long-form thinking on debugging habits, observability, and the systems around the bug.
The Art of the Minimal Reproducible Example: A Debugging Superpower
A minimal reproducible example (MRE) is more than just a snippet — it's a tool that isolates the bug, saves time, and gets you faster answers. Here's how to build one that works, with a real-world war story.
Retry Storms: When Retries Make a Cascading Failure Worse
Retries seem like a safety net, but in a distributed system under load they can turn a small hiccup into a full outage. Here's how retry storms form and what to do about them.
Caching Bugs Are the Worst: A Postmortem on Stale Data Disasters
A deep dive into the most insidious caching bugs, with real postmortems and practical patterns to avoid stale-data disasters.
Observability vs. Monitoring: Why Your On-Call Rotation Still Wakes You Up at 3 AM
Monitoring tells you something is broken. Observability lets you figure out why—without guessing, without SSH, without restarting the pod.
Debugging Flaky Tests for Good: A Systematic Approach to Root Cause Analysis
Flaky tests waste time and erode trust. Here's how to find and fix the actual root cause instead of just rerunning.
Idempotency Keys: The Safety Net Your Payment API Needs
How idempotency keys prevent double charges, lost refunds, and data corruption in payment APIs. With real-world examples and edge cases you haven't considered.