awslabs/shuttle

Health v2 · maintenance only

Adoption not part of the score

1050 stars · 59 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Shuttle is a Rust library for testing concurrent code using randomized concurrency scheduling techniques with probabilistic bug-finding guarantees. It provides drop-in wrappers for std::sync, tokio, and rand so tests can deterministically reproduce race conditions.

Use cases

• find race conditions in concurrent Rust code
• reproduce flaky multithreaded tests deterministically
• test async tokio code for scheduling bugs
• randomly stress-test thread synchronization primitives
• debug intermittent concurrency failures in CI

When to choose

• you write concurrent or async Rust and need reliable detection of race conditions
• you want deterministic reproduction of nondeterministic concurrency bugs
• you need a randomized alternative to exhaustive checkers like Loom for larger programs

When to avoid

• you need exhaustive formal verification of all interleavings
• your code is single-threaded with no concurrency
• you are testing concurrency in languages other than Rust

Facets

library · maturity active

testing concurrency fuzzing testing developer-tools rust cross-platform concurrency-testing randomized-scheduling race-condition-detection async-testing rust concurrency

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