Fix FiberHandle.clear race

[xianjianlf2]

Summary

• capture the fiber being cleared before interrupting it
• only empty the handle if it still points at that same fiber after interruption completes
• add a regression test for installing a newer fiber while clear is waiting for the previous fiber to interrupt

Fixes #5906.

Tests

• pnpm lint-fix
• pnpm test packages/effect/test/FiberHandle.test.ts
• pnpm check

Summary by CodeRabbit

• Bug Fixes

  • Fixed a race condition where clearing a fiber handle could inadvertently remove a newer fiber installed during the interruption process.
  • Fiber handles now preserve newly installed fibers correctly when clearing a previous fiber.

• Tests

  • Added coverage to verify fiber handles retain newer fibers during concurrent interruption and replacement.

[changeset-bot]

🦋 Changeset detected

Latest commit: 07bcba2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 27 packages

Name	Type
effect	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/vitest	Patch
@effect/ai-anthropic	Patch
@effect/ai-openai-compat	Patch
@effect/ai-openai	Patch
@effect/ai-openrouter	Patch
@effect/atom-react	Patch
@effect/atom-solid	Patch
@effect/atom-vue	Patch
@effect/sql-clickhouse	Patch
@effect/sql-d1	Patch
@effect/sql-libsql	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-pglite	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-do	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/openapi-generator	Patch

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 110015c9-b775-41e1-bcbd-4eae1da830a1

📥 Commits

Reviewing files that changed from the base of the PR and between 4e0be58 and 07bcba2.

📒 Files selected for processing (3)

• .changeset/fix-fiberhandle-clear-race.md
• packages/effect/src/FiberHandle.ts
• packages/effect/test/FiberHandle.test.ts

---

📝 Walkthrough

Walkthrough

FiberHandle.clear now avoids removing a newer fiber installed during interruption of the previous fiber. A deterministic test covers the race, and a patch changeset documents the fix.

Changes

FiberHandle clear race

Layer / File(s)	Summary
Guard FiberHandle.clear cleanup packages/effect/src/FiberHandle.ts, packages/effect/test/FiberHandle.test.ts, .changeset/fix-fiberhandle-clear-race.md	clear captures the interrupted fiber and conditionally clears only that fiber; a controlled-clock test verifies replacement preservation, and a patch changeset records the fix.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: bug

Suggested reviewers: gcanti

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The fix matches #5906 by preserving the current fiber and only clearing when the same fiber is still stored.
Out of Scope Changes check	✅ Passed	All changes are directly related to the FiberHandle.clear race fix, its regression test, and the release note.

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[github-actions]

Bundle Size Analysis

File Name	Current Size	Previous Size	Difference
basic.ts	6.66 KB	6.64 KB	+0.02 KB (+0.24%)
batching.ts	9.35 KB	9.33 KB	+0.01 KB (+0.16%)
brand.ts	6.14 KB	6.20 KB	-0.06 KB (-0.89%)
cache.ts	10.15 KB	10.13 KB	+0.02 KB (+0.21%)
config.ts	18.98 KB	19.02 KB	-0.04 KB (-0.19%)
differ.ts	17.20 KB	18.39 KB	-1.19 KB (-6.48%)
http-client.ts	20.66 KB	20.65 KB	+0.01 KB (+0.04%)
logger.ts	10.26 KB	10.24 KB	+0.02 KB (+0.17%)
metric.ts	8.53 KB	8.52 KB	+0.01 KB (+0.12%)
optic.ts	7.35 KB	7.35 KB	0.00 KB (0.00%)
pubsub.ts	14.18 KB	14.17 KB	+0.01 KB (+0.06%)
queue.ts	11.11 KB	11.10 KB	+0.01 KB (+0.07%)
schedule.ts	10.30 KB	10.28 KB	+0.02 KB (+0.20%)
schema-class.ts	18.04 KB	18.12 KB	-0.08 KB (-0.44%)
schema-fromJsonSchemaDocument.ts	4.06 KB	27.27 KB	-23.20 KB (-85.10%)
schema-representation-roundtrip.ts	27.41 KB	24.12 KB	+3.28 KB (+13.61%)
schema-string-transformation.ts	12.62 KB	12.59 KB	+0.03 KB (+0.25%)
schema-string.ts	10.29 KB	10.26 KB	+0.04 KB (+0.39%)
schema-template-literal.ts	14.35 KB	14.31 KB	+0.04 KB (+0.27%)
schema-toArbitraryLazy.ts	20.85 KB	20.89 KB	-0.04 KB (-0.21%)
schema-toCodeDocument.ts	21.41 KB	23.37 KB	-1.96 KB (-8.40%)
schema-toCodecJson.ts	18.01 KB	18.28 KB	-0.27 KB (-1.45%)
schema-toEquivalence.ts	17.91 KB	17.96 KB	-0.05 KB (-0.30%)
schema-toFormatter.ts	17.73 KB	17.82 KB	-0.08 KB (-0.47%)
schema-toJsonSchemaDocument.ts	20.31 KB	21.46 KB	-1.16 KB (-5.38%)
schema-toRepresentation.ts	18.29 KB	18.51 KB	-0.22 KB (-1.20%)
schema.ts	17.31 KB	17.38 KB	-0.07 KB (-0.40%)
stm.ts	12.03 KB	12.02 KB	+0.01 KB (+0.10%)
stream.ts	9.30 KB	9.28 KB	+0.01 KB (+0.16%)