test(runtime): deterministic restart and fault-injection recovery - #54
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📝 SummarySummary by CodeRabbit
WalkthroughChangesAdded a public deterministic runtime module with durable checkpoint validation, fake time, scripted ingress, bounded execution, fault injection, restart recovery, replay handling, and lifecycle tests. ChangesRuntime harness
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant ScriptedSource
participant RuntimeHarness
participant DurableStore
participant FakeCore
ScriptedSource->>RuntimeHarness: provide sequenced ingress
RuntimeHarness->>DurableStore: persist in-flight tick
RuntimeHarness->>FakeCore: execute packet stimuli
FakeCore-->>RuntimeHarness: return emitted spike IDs
RuntimeHarness->>DurableStore: persist committed output and metrics
RuntimeHarness-->>ScriptedSource: return TickResult
Suggested labels: Merge Risk: 🔵 Low · up to The remaining defects are confined to fake-checkpoint validation and release-note accuracy, so they present bounded risk but should be corrected. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 31.37% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 102 functions across 8 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
✨ Simplify code
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This PR adds a comprehensive CPU-only fault-injection harness for testing deterministic restart semantics. The implementation is well-structured and thoroughly tested across 17 fault injection points with 6 different seeds (102 total test cases).
Key strengths:
- Clear separation between durable and volatile state with proper validation
- Comprehensive fault coverage including initialization, checkpoint validation, ingress, tick execution, metric publication, and shutdown boundaries
- Oracle function (
expected_outcome) that documents expected behavior for each fault point and is validated by tests - Proper handling of incomplete ticks with replay protection to prevent double-counting
- Monotonic session IDs with proper increment across restarts
The code is well-tested, follows Rust best practices, and correctly implements the stated contract. No blocking issues found.
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Up to standards ✅🟢 Issues
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| Metric | Results |
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| Complexity | 196 |
| Duplication | 6 |
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Code Review Summary
| Analyzer | Status | Updated (UTC) | Details |
|---|---|---|---|
| Rust |  |
Sep 17, 2026 9:08p.m. | Review ↗ |
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Sep 17, 2026 9:08p.m. | Review ↗ |
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Actionable comments posted: 2
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Inline comments:
In `@src/runtime/harness.rs`:
- Around line 448-450: Define a harness-owned fault_health mapping for
FaultPoint and update RuntimeHarness::apply_fault to set health from it instead
of expected_outcome(point).terminal_health. Preserve the listed health
classifications, keep expected_outcome available for assertions elsewhere, and
remove only its import if it is no longer needed in the harness.
In `@src/runtime/mod.rs`:
- Line 564: Update the clock assertion in the harness test to compare
h.clock().now_ns() against the clock’s seeded start value, rather than the fixed
TICK_PERIOD_NS * 8 threshold, so it verifies begin_tick advanced time. Use the
existing HarnessBuilder::build seed initialization behavior when determining the
expected baseline.
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CHANGELOG.mdsrc/lib.rssrc/runtime/durable.rssrc/runtime/harness.rssrc/runtime/mod.rs
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All reported issues were addressed across 3 files (changes from recent commits).
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Re-trigger cubic
Add a CPU-only fake-clock/fake-core harness that injects failures at lifecycle boundaries and proves restart preserves only durable session/tick/ingress identifiers. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Extract initialization, checkpoint restore, tick execution, and metric publication into dedicated methods so Codacy complexity stays within the PR gate without changing the fault-injection contract. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Use checked session/tick increments so u64::MAX checkpoints fail closed instead of overflowing. Persist durable state before appending metrics or outputs, and drop out-of-range fake-core spike indexes. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Arming MalformedCheckpoint now writes a bad blob so restart stays RejectedInvalid. In-flight records must belong to last_session_id. Harness health is assigned independently of the test oracle. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Compare elapsed time against the builder's start instant so the synchronous harness test fails if begin_tick never advances. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
A checkpoint at committed_tick_seq == u64::MAX now fails closed during validation instead of entering Live and overflowing on the next tick. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Move clock, fakes, injector, and matrix tests out of harness.rs so no runtime source file exceeds Codacy's 500 non-comment-line limit. LIM-1218 Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@CHANGELOG.md`:
- Around line 14-15: Update the restart-state description near “durable
session/tick/ingress identifiers” to include checkpoint identity among the
preserved state, while leaving the existing replayed-input behavior unchanged.
In `@src/runtime/durable.rs`:
- Around line 113-115: Update DurableState::validate_inflight to reject any
in-flight ingress sequence less than or equal to committed_ingress_seq,
replacing the zero-only check. Preserve the existing validation error behavior
while reporting both sequence values, so recovery cannot accept an already
committed in-flight record.
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CHANGELOG.mdsrc/lib.rssrc/runtime/clock.rssrc/runtime/durable.rssrc/runtime/fakes.rssrc/runtime/harness.rssrc/runtime/inject.rssrc/runtime/mod.rssrc/runtime/tests.rs
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Fail closed when a fake-core checkpoint marks work in flight at or below committed_ingress_seq, so restart cannot skip the documented incomplete-tick retry. Mention checkpoint identity in the changelog. Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
Keeps the health-states branch mergeable after #54 landed on main. Co-authored-by: Raul Cardenas Montoya <montoyaraul34@gmail.com>
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rmems
modified the milestones:
v0.3.0 — Spikenaut SNN runtime,
02 — v0.3.0 release qualification,
01 — Delivered runtime foundation
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User description
Closes LIM-1218.
Add a CPU-only fake-clock / fake-core harness that injects faults at runtime lifecycle boundaries and proves restart preserves only explicitly durable state.
Durable vs volatile
fake-core-v1)last_session_id(monotonic)committed_tick_seqcommitted_ingress_seqHealth(recomputed on boot)An incomplete prior session is a durable
inflightrecord. The next boot clears it, does not publish a success for that tick, and allows the same ingress sequence to be retried once. Replayed ingress withseq <= committed_ingress_seqis skipped so it cannot be double-counted as fresh work. An inflight marker whose ingress sequence is already committed is rejected before the live loop.The live
BrainstemDaemon::runloop is unchanged. Live Distill sidecar loading (LIM-1133 / #52 / #59) is independent of this harness, which uses an in-memoryfake-core-v1blob.Fault-point / result matrix
Oracle:
brainstem_daemon::runtime::expected_outcome. Tests compare the harness to this table for every seed.Before(Initialize)After(Initialize)Before(CheckpointValidation)After(CheckpointValidation)Before(Ingress)After(Ingress)Before(TickExecute)After(TickExecute)Before(MetricPublish)After(MetricPublish)Before(Shutdown)After(Shutdown)MalformedCheckpointCoreStepErrorClosedChannelBackpressureTimeoutInterruptedShutdownShutdown faults complete one successful tick first, then inject. Partial-tick faults leave
inflightset; restart must not emit a false success or duplicate the later committed output.Seed matrix
FAULT_SEEDS = [0, 1, 7, 42, 1337, 20260915]The harness is synchronous: fake clock
advancenever sleeps, and each instance is capped atMAX_STEPS(64). No sockets, GPUs, or background tasks.Verification
cargo fmt --checkcargo clippy --locked --all-targets -- -D warningscargo test --lockedCC=gcc CXX=g++ cargo clippy --locked --all-targets --all-features -- -D warningsCC=gcc CXX=g++ RUSTFLAGS="-C link-arg=-L/usr/lib/gcc/x86_64-linux-gnu/13" cargo test --locked --all-featuresThis revision rebases onto
main(#58, #52, #59, #51). Bot review threads are addressed: overflow fail-closed, poison malformed checkpoints, persist-before-publish, independent fault-health mapping, documented high-water-mark ingress, and rejection of inflight markers that are already committed.Linear Issue: LIM-1218
Summary by cubic
Adds a CPU-only fake-clock/fake-core harness that pins deterministic restart and fault-recovery semantics for the runtime without touching the live
BrainstemDaemon::runloop (LIM-1218).last_session_idor whose ingress is already committed.fake-core-v1blob as a separate contract.Written for commit 74d7ca3. Summary will update on new commits.
CodeAnt-AI Description
Add deterministic runtime restart recovery and fault handling
What Changed
Impact
✅ Safe recovery after interrupted ticks✅ No duplicate processing after replay✅ Invalid checkpoints fail before live execution💡 Usage Guide
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