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‎README_CORRUPTION_TESTS.md‎

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# Advanced Corruption Testing for libsql
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Hey there! I'm hamisi and I've been working on some pretty intense testing for libsql. After diving deep into the codebase, I noticed there were some areas where we could really stress test the system to make sure it's rock solid.
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## What I Built
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I've created a bunch of test suites that really push libsql to its limits. The idea is to simulate all kinds of crazy scenarios that might happen in production - network failures, memory pressure, concurrent operations going wild, you name it.
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### The Test Files
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**Basic Corruption Tests** (`data_corruption_simulation.rs`)
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This is where I started. I wanted to see what happens when transactions get interrupted by network issues, or when the WAL gets compacted while stuff is still happening. Pretty basic but important stuff.
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**Advanced Scenarios** (`advanced_corruption_scenarios.rs`)
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This one gets more interesting. I'm testing things like what happens when replicas get out of sync, or when checkpoints happen at the worst possible time. The kind of edge cases that keep you up at night.
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**Extreme Stress Tests** (`extreme_corruption_tests.rs`)
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Okay, this is where I went a bit crazy. I'm running 20+ workers all hitting the database at once with tiny memory limits and terrible network conditions. If there's a race condition hiding somewhere, this should find it.
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**Edge Cases** (`edge_case_corruption_tests.rs`)
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All the weird stuff - what happens with massive integers, crazy Unicode characters, NULL values where they shouldn't be. The kind of data that breaks things in unexpected ways.
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**The Big One** (`comprehensive_bug_hunter.rs`)
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This runs everything at once. Multiple scenarios, different types of operations, maximum chaos. It's like throwing everything at the wall and seeing what sticks.
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## How It Works
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I'm using the Turmoil simulation framework because it lets me create reproducible network failures. No more "works on my machine" - if there's a bug, I can reproduce it every time.
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The tests are pretty aggressive:
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- Super small log sizes to force constant compaction
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- Limited bandwidth to create realistic lag
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- Strategic timing of network failures
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- Lots of concurrent operations
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## What I'm Looking For
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Basically any kind of data corruption:
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- Transactions that should succeed but fail
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- Data that gets lost or corrupted
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- Constraints that get violated
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- Inconsistencies between replicas
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- Memory corruption issues
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- Unicode handling problems
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## Running the Tests
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```bash
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# Run everything (warning: takes a while)
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cargo test corruption
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# Run specific tests
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cargo test extreme_concurrent_stress_test
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cargo test unicode_corruption_test
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cargo test memory_pressure_corruption_test
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# Get detailed output
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cargo test -- --nocapture
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```
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## My Testing Philosophy
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I believe in breaking things before users do. These tests are designed to find the bugs that only show up under extreme conditions - the ones that are really hard to debug in production.
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Every test has comprehensive verification built in. If something goes wrong, you'll know exactly what and where. No silent failures.
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## Technical Details
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The tests use deterministic simulation, so they're reproducible. I've also built in real-time corruption detection - the moment something goes wrong, the test will catch it and tell you exactly what happened.
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I'm particularly focused on:
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- Race conditions in transaction processing
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- WAL integrity during compaction
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- Memory management under pressure
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- Network partition recovery
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- Data encoding/decoding edge cases
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## Why This Matters
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Database corruption is scary. When it happens in production, you're looking at data loss, downtime, and very unhappy users. These tests help catch those issues before they ever see the light of day.
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I've tried to cover all the scenarios I can think of, but I'm sure there are more. That's the nature of testing - you find what you're looking for, and sometimes you find things you weren't expecting.
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## Contributing
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If you want to add more tests or improve existing ones, go for it! The pattern is pretty straightforward:
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1. Set up the scenario
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2. Apply stress/failures
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3. Verify everything is still correct
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4. Report any issues found
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The more edge cases we can test, the more confident we can be in the system's reliability.
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---
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*These tests represent my attempt to really push libsql to its limits and make sure it can handle whatever production throws at it. Hope they're useful!*
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- hamisi

‎libsql-server/tests/advanced_corruption_scenarios.rs‎

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//! Advanced corruption scenarios targeting specific edge cases
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//!
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//! This module contains tests that target very specific edge cases and race conditions
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//! that could lead to data corruption in distributed database systems.
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//! Advanced Scenarios - The Tricky Stuff
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//!
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//! Hey, hamisi here. After the basic tests, I wanted to dig into the really
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//! complex scenarios that are hard to reproduce but can cause serious problems.
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//! These are the edge cases that keep database engineers awake at night.
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
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use std::sync::Arc;

‎libsql-server/tests/comprehensive_bug_hunter.rs‎

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//! Comprehensive Bug Hunter Test Suite
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//!
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//! Created by hamisionesmus for Turso bug bounty program
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//! This module orchestrates all corruption tests to maximize bug discovery
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//! and provides detailed reporting for bounty submissions.
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//! The Big Kahuna - Comprehensive Corruption Testing
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//!
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//! Hey, this is hamisi. I got a bit carried away and created this monster test
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//! that basically throws everything at libsql at once. If there are bugs hiding
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//! in the system, this should shake them out.
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use std::collections::HashMap;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
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use crate::common::http::Client;
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use crate::common::net::{init_tracing, SimServer, TestServer, TurmoilAcceptor, TurmoilConnector};
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/// Comprehensive test that runs multiple corruption scenarios simultaneously
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/// This maximizes the chance of finding race conditions and edge case bugs
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/// This is my attempt at creating the ultimate stress test. I'm running
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/// multiple different corruption scenarios at the same time to see if I can
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/// find any weird interactions or race conditions that only show up under extreme load.
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#[test]
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fn comprehensive_multi_scenario_corruption_test() {
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let mut sim = Builder::new()

‎libsql-server/tests/data_corruption_simulation.rs‎

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//! Advanced data corruption simulation tests
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//!
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//! This module contains sophisticated simulation tests designed to expose
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//! data corruption bugs that might survive the current deterministic testing.
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//!
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//! The tests focus on:
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//! 1. Concurrent transaction handling with network failures
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//! 2. Replication consistency under various failure scenarios
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//! 3. WAL corruption and recovery scenarios
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//! 4. Schema migration data integrity
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//! 5. Snapshot compaction race conditions
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//! Basic Corruption Testing - Where It All Started
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//!
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//! This is hamisi. I started here when I was trying to figure out how to
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//! really test libsql under stress. These are the core tests that focus on
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//! transaction handling and what happens when the network decides to be
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//! unreliable at the worst possible moments.
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//!
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//! What I'm testing:
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//! 1. Transactions getting interrupted by network issues
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//! 2. What happens when replicas get out of sync
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//! 3. WAL corruption during compaction (the scary stuff)
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//! 4. Schema changes while data is being modified
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//! 5. Race conditions during snapshot creation
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use std::collections::HashMap;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};

‎libsql-server/tests/edge_case_corruption_tests.rs‎

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//! Edge case corruption tests for maximum bug discovery
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//!
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//! Created by hamisionesmus for Turso bug bounty program
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//! These tests target specific edge cases and boundary conditions
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//! that are most likely to expose data corruption bugs.
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//! Edge Cases and Weird Data - The Fun Stuff
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//!
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//! Hey, it's hamisi. This file is all about the weird edge cases that
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//! developers usually don't think about. You know, the stuff that breaks
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//! when users do unexpected things with your database.
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use std::collections::HashMap;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};

‎libsql-server/tests/extreme_corruption_tests.rs‎

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//! Extreme corruption tests designed to maximize bug discovery
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//!
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//! Created by hamisionesmus for Turso bug bounty program
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//! These tests target the most vulnerable areas for data corruption
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//! with extreme stress conditions to expose maximum number of bugs.
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//! Extreme Stress Testing - When Normal Testing Isn't Enough
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//!
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//! This is hamisi again. I wanted to see what happens when we really push
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//! the system to its absolute limits. These tests are pretty aggressive -
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//! they're designed to find the bugs that only show up under extreme conditions.
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use std::collections::HashMap;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};

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