Fix stream serialization to resolve when user releases lock instead of waiting for stream to close by TooTallNate · Pull Request #678 · vercel/workflow

TooTallNate · 2025-12-22T20:41:08Z

Fix stream serialization to resolve when users release locks instead of waiting for streams to close, preventing Vercel functions from hanging.

What changed?

Implemented a polling mechanism to detect when stream locks are released
Added flushablePipe function that resolves in two scenarios:
1. When the stream completes normally (close/error)
2. When the user releases their lock AND all pending writes are flushed
Created a state tracking system to monitor pending operations and lock status

How to test?

Create a workflow step that incrementally writes to a stream:

const writer = stream.getWriter();
await writer.write(data1);
writer.releaseLock(); // Step should complete here without waiting

Verify the step completes immediately after lock release rather than hanging
Run the new test cases that verify both lock release and normal stream closure behaviors

Why make this change?

This fixes an issue where Vercel functions would hang when users incrementally write to streams within steps. Previously, the system would wait for the stream to fully close before resolving, but many users follow a pattern where they write data and release the lock without explicitly closing the stream. This change allows steps to complete as soon as the user releases the lock and all pending writes are flushed, which is the expected behavior in most streaming scenarios.

changeset-bot · 2025-12-22T20:41:11Z

🦋 Changeset detected

Latest commit: 5cdb799

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

This PR includes changesets to release 13 packages

Name	Type
@workflow/core	Patch
@workflow/builders	Patch
@workflow/cli	Patch
@workflow/docs-typecheck	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/web-shared	Patch
workflow	Patch
@workflow/astro	Patch
@workflow/sveltekit	Patch
@workflow/world-testing	Patch
@workflow/nuxt	Patch
@workflow/ai	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

github-actions · 2025-12-22T20:41:16Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	363	0	11	374
✅ 💻 Local Development	332	0	8	340
✅ 📦 Local Production	332	0	8	340
✅ 🐘 Local Postgres	332	0	8	340
✅ 🪟 Windows	34	0	0	34
❌ 🌍 Community Worlds	131	17	0	148
Total	1524	17	35	1576

❌ Failed Tests

🌍 Community Worlds (17 failed)

mongodb (1 failed):

webhookWorkflow

redis (1 failed):

webhookWorkflow

starter (14 failed):

addTenWorkflow
addTenWorkflow
error handling error propagation workflow errors nested function calls preserve message and stack trace
error handling error propagation workflow errors cross-file imports preserve message and stack trace
error handling error propagation step errors basic step error preserves message and stack trace
error handling error propagation step errors cross-file step error preserves message and function names in stack
error handling retry behavior regular Error retries until success
error handling retry behavior FatalError fails immediately without retries
error handling catchability FatalError can be caught and detected with FatalError.is()
hookCleanupTestWorkflow - hook token reuse after workflow completion
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
pathsAliasWorkflow - TypeScript path aliases resolve correctly

turso (1 failed):

webhookWorkflow

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro	33	1
✅ example	33	1
✅ express	33	1
✅ fastify	33	1
✅ hono	33	1
✅ nextjs-turbopack	33	1
✅ nextjs-webpack	33	1
✅ nitro	33	1
✅ nuxt	33	1
✅ sveltekit	33	1
✅ vite	33	1

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	34	0	0

❌ 🌍 Community Worlds

App	Passed	Failed
✅ mongodb-dev	3	0
❌ mongodb	33	1
✅ redis-dev	3	0
❌ redis	33	1
✅ starter-dev	3	0
❌ starter	20	14
✅ turso-dev	3	0
❌ turso	33	1

📋 View full workflow run

vercel · 2025-12-22T20:41:16Z

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Jan 12, 2026 10:45pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Jan 12, 2026 10:45pm
example-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-astro-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-express-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-fastify-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-hono-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-nitro-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-nuxt-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workbench-vite-workflow	Ready	Preview, Comment	Jan 12, 2026 10:45pm
workflow-docs	Ready	Preview, Comment	Jan 12, 2026 10:45pm

github-actions · 2025-12-22T20:41:17Z

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.032s (-34.1% 🟢)	1.007s (~)	0.976s	10	1.00x
🌐 Starter	Next.js (Turbopack)	0.040s (+24.0% 🔺)	1.014s (~)	0.974s	10	1.26x
💻 Local	Next.js (Turbopack)	0.040s (-0.5%)	1.020s (~)	0.980s	10	1.26x
🌐 Redis	Next.js (Turbopack)	0.040s (+14.8% 🔺)	1.017s (~)	0.977s	10	1.28x
💻 Local	Nitro	0.041s (-1.2%)	1.006s (~)	0.965s	10	1.31x
🌐 Turso	Next.js (Turbopack)	0.098s (-9.0% 🟢)	1.013s (~)	0.916s	10	3.10x
🌐 MongoDB	Next.js (Turbopack)	0.116s (-9.7% 🟢)	1.020s (+0.6%)	0.904s	10	3.68x
🐘 Postgres	Next.js (Turbopack)	0.191s (+56.9% 🔺)	1.020s (~)	0.829s	10	6.07x
🐘 Postgres	Nitro	0.298s (+16.0% 🔺)	1.012s (-0.7%)	0.714s	10	9.47x
🐘 Postgres	Express	0.327s (-12.0% 🟢)	1.013s (~)	0.686s	10	10.39x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	0.592s (-22.8% 🟢)	1.521s (-14.0% 🟢)	0.929s	10	1.00x
▲ Vercel	Nitro	0.606s (-21.1% 🟢)	1.580s (-8.3% 🟢)	0.974s	10	1.02x
▲ Vercel	Express	0.643s (-17.0% 🟢)	1.557s (-2.9%)	0.914s	10	1.09x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.074s (-3.5%)	2.008s (~)	0.934s	10	1.00x
🌐 Starter	Next.js (Turbopack)	1.090s (+1.7%)	2.010s (~)	0.920s	10	1.01x
💻 Local	Next.js (Turbopack)	1.093s (~)	2.014s (~)	0.920s	10	1.02x
🌐 Redis	Next.js (Turbopack)	1.100s (+1.3%)	2.013s (~)	0.913s	10	1.02x
💻 Local	Nitro	1.111s (~)	2.006s (~)	0.894s	10	1.04x
🌐 Turso	Next.js (Turbopack)	1.292s (-1.4%)	2.012s (~)	0.720s	10	1.20x
🌐 MongoDB	Next.js (Turbopack)	1.300s (+0.5%)	2.022s (~)	0.721s	10	1.21x
🐘 Postgres	Next.js (Turbopack)	1.909s (~)	2.014s (~)	0.104s	10	1.78x
🐘 Postgres	Nitro	2.164s (-2.1%)	3.014s (~)	0.850s	10	2.02x
🐘 Postgres	Express	2.194s (-0.5%)	3.014s (~)	0.820s	10	2.04x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.662s (-1.8%)	3.667s (+1.4%)	1.004s	10	1.00x
▲ Vercel	Nitro	2.712s (-2.3%)	3.722s (+1.7%)	1.010s	10	1.02x
▲ Vercel	Next.js (Turbopack)	2.761s (~)	3.728s (-2.0%)	0.967s	10	1.04x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	10.506s (-2.5%)	11.013s (~)	0.507s	5	1.00x
🌐 Starter	Next.js (Turbopack)	10.585s (+1.1%)	11.012s (~)	0.427s	5	1.01x
💻 Local	Next.js (Turbopack)	10.606s (~)	11.025s (~)	0.419s	5	1.01x
🌐 Redis	Next.js (Turbopack)	10.674s (+1.2%)	11.016s (~)	0.342s	5	1.02x
💻 Local	Nitro	10.780s (~)	11.011s (~)	0.230s	5	1.03x
🌐 MongoDB	Next.js (Turbopack)	12.048s (-1.5%)	12.638s (-3.0%)	0.590s	5	1.15x
🌐 Turso	Next.js (Turbopack)	12.165s (~)	13.026s (~)	0.860s	5	1.16x
🐘 Postgres	Next.js (Turbopack)	15.240s (+3.1%)	16.036s (+2.6%)	0.796s	5	1.45x
🐘 Postgres	Express	20.311s (~)	21.042s (~)	0.731s	5	1.93x
🐘 Postgres	Nitro	20.421s (~)	21.033s (~)	0.612s	5	1.94x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	22.014s (~)	23.014s (+0.6%)	1.001s	5	1.00x
▲ Vercel	Next.js (Turbopack)	22.284s (-0.9%)	23.295s (+0.6%)	1.011s	5	1.01x
▲ Vercel	Express	22.326s (-3.0%)	23.090s (-2.3%)	0.764s	5	1.01x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.325s (-5.5% 🟢)	2.006s (~)	0.680s	15	1.00x
🌐 Redis	Next.js (Turbopack)	1.344s (+1.8%)	2.009s (~)	0.665s	15	1.01x
🌐 Starter	Next.js (Turbopack)	1.350s (+3.5%)	2.008s (~)	0.658s	15	1.02x
💻 Local	Next.js (Turbopack)	1.391s (+1.0%)	2.015s (~)	0.624s	15	1.05x
💻 Local	Nitro	1.408s (~)	2.006s (~)	0.598s	15	1.06x
🐘 Postgres	Next.js (Turbopack)	1.818s (+8.5% 🔺)	2.087s (+3.7%)	0.270s	15	1.37x
🌐 MongoDB	Next.js (Turbopack)	2.169s (+1.5%)	3.020s (~)	0.851s	10	1.64x
🐘 Postgres	Express	2.208s (-9.3% 🟢)	2.923s (-3.0%)	0.715s	11	1.67x
🌐 Turso	Next.js (Turbopack)	2.224s (~)	3.014s (~)	0.791s	10	1.68x
🐘 Postgres	Nitro	2.444s (+0.5%)	3.013s (~)	0.569s	10	1.84x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.789s (-6.8% 🟢)	3.804s (+0.6%)	1.014s	8	1.00x
▲ Vercel	Express	2.922s (+0.6%)	3.854s (+4.6%)	0.933s	8	1.05x
▲ Vercel	Next.js (Turbopack)	2.988s (-0.7%)	3.767s (-2.8%)	0.779s	8	1.07x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.978s (-11.0% 🟢)	2.093s (-33.8% 🟢)	0.115s	15	1.00x
💻 Local	Next.js (Turbopack)	2.136s (+0.7%)	3.032s (+2.4%)	0.896s	10	1.08x
💻 Local	Nitro	2.210s (-0.7%)	3.166s (~)	0.956s	10	1.12x
🌐 Starter	Next.js (Turbopack)	2.469s (+3.9%)	3.011s (~)	0.542s	10	1.25x
🌐 Redis	Next.js (Turbopack)	2.473s (+5.6% 🔺)	3.010s (~)	0.537s	10	1.25x
🐘 Postgres	Next.js (Turbopack)	2.482s (-3.3%)	3.019s (~)	0.537s	10	1.25x
🐘 Postgres	Nitro	2.822s (-7.3% 🟢)	3.017s (-20.2% 🟢)	0.195s	10	1.43x
🐘 Postgres	Express	2.885s (+2.2%)	3.238s (+7.2% 🔺)	0.353s	10	1.46x
🌐 Turso	Next.js (Turbopack)	4.783s (+1.9%)	5.182s (~)	0.400s	6	2.42x
🌐 MongoDB	Next.js (Turbopack)	4.833s (+4.7%)	5.359s (+3.4%)	0.525s	6	2.44x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	3.099s (-8.6% 🟢)	3.643s (-9.3% 🟢)	0.545s	9	1.00x
▲ Vercel	Express	3.980s (+24.7% 🔺)	4.694s (+30.4% 🔺)	0.714s	7	1.28x
▲ Vercel	Nitro	4.374s (+18.1% 🔺)	5.201s (+19.9% 🔺)	0.827s	6	1.41x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.334s (-6.1% 🟢)	2.006s (~)	0.672s	15	1.00x
🌐 Redis	Next.js (Turbopack)	1.359s (+3.0%)	2.009s (~)	0.651s	15	1.02x
🌐 Starter	Next.js (Turbopack)	1.368s (+3.9%)	2.007s (~)	0.640s	15	1.03x
💻 Local	Next.js (Turbopack)	1.383s (-1.8%)	2.018s (~)	0.635s	15	1.04x
💻 Local	Nitro	1.421s (~)	2.005s (~)	0.585s	15	1.06x
🐘 Postgres	Next.js (Turbopack)	1.795s (+2.4%)	2.011s (~)	0.216s	15	1.35x
🐘 Postgres	Express	1.796s (-8.4% 🟢)	2.013s (-9.8% 🟢)	0.217s	15	1.35x
🐘 Postgres	Nitro	2.094s (+18.2% 🔺)	2.742s (+36.3% 🔺)	0.648s	11	1.57x
🌐 MongoDB	Next.js (Turbopack)	2.137s (-0.6%)	3.018s (~)	0.881s	10	1.60x
🌐 Turso	Next.js (Turbopack)	2.207s (-0.6%)	3.011s (~)	0.804s	10	1.65x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.775s (~)	3.734s (~)	0.959s	9	1.00x
▲ Vercel	Next.js (Turbopack)	2.793s (-0.7%)	3.767s (-1.5%)	0.974s	9	1.01x
▲ Vercel	Express	2.904s (-7.6% 🟢)	3.780s (-2.7%)	0.876s	8	1.05x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	2.057s (-9.0% 🟢)	2.869s (-11.1% 🟢)	0.812s	11	1.00x
💻 Local	Next.js (Turbopack)	2.193s (+1.9%)	3.157s (+3.5%)	0.963s	10	1.07x
💻 Local	Nitro	2.359s (+7.0% 🔺)	3.222s (+2.0%)	0.863s	10	1.15x
🌐 Starter	Next.js (Turbopack)	2.485s (+4.8%)	3.008s (~)	0.524s	10	1.21x
🐘 Postgres	Next.js (Turbopack)	2.494s (-2.9%)	3.013s (~)	0.519s	10	1.21x
🐘 Postgres	Express	2.499s (-8.5% 🟢)	3.024s (~)	0.525s	10	1.21x
🌐 Redis	Next.js (Turbopack)	2.502s (+5.9% 🔺)	3.010s (~)	0.508s	10	1.22x
🐘 Postgres	Nitro	2.769s (-3.0%)	3.021s (-3.4%)	0.252s	10	1.35x
🌐 Turso	Next.js (Turbopack)	4.748s (+2.7%)	5.185s (~)	0.437s	6	2.31x
🌐 MongoDB	Next.js (Turbopack)	4.840s (+4.3%)	5.359s (+3.4%)	0.519s	6	2.35x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	3.065s (-2.8%)	3.606s (-8.0% 🟢)	0.541s	9	1.00x
▲ Vercel	Express	3.209s (-5.5% 🟢)	3.794s (-8.0% 🟢)	0.585s	8	1.05x
▲ Vercel	Nitro	3.300s (+4.0%)	4.033s (+5.2% 🔺)	0.733s	8	1.08x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Stream Benchmarks (includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.107s (-38.6% 🟢)	0.998s (+0.6%)	0.013s (-20.3% 🟢)	1.018s (~)	0.911s	10	1.00x
🌐 Starter	Next.js (Turbopack)	0.125s (+33.7% 🔺)	1.006s (~)	0.000s (~)	1.012s (~)	0.887s	10	1.17x
💻 Local	Next.js (Turbopack)	0.129s (-6.8% 🟢)	1.004s (~)	0.015s (-8.1% 🟢)	1.028s (~)	0.899s	10	1.21x
🌐 Redis	Next.js (Turbopack)	0.147s (+26.6% 🔺)	1.005s (~)	0.000s (NaN%)	1.013s (~)	0.866s	10	1.38x
💻 Local	Nitro	0.177s (~)	0.992s (~)	0.014s (-4.7%)	1.020s (~)	0.842s	10	1.66x
🌐 MongoDB	Next.js (Turbopack)	0.486s (-6.8% 🟢)	0.971s (+4.9%)	0.000s (NaN%)	1.019s (+0.6%)	0.533s	10	4.55x
🌐 Turso	Next.js (Turbopack)	0.521s (+5.0% 🔺)	0.934s (-1.7%)	0.000s (NaN%)	1.013s (~)	0.492s	10	4.89x
🐘 Postgres	Next.js (Turbopack)	1.077s (+24.3% 🔺)	1.967s (+74.6% 🔺)	0.000s (-100.0% 🟢)	2.015s (+52.6% 🔺)	0.939s	10	10.09x
🐘 Postgres	Express	2.296s (-2.9%)	2.741s (+2.3%)	0.000s (NaN%)	3.015s (~)	0.719s	10	21.52x
🐘 Postgres	Nitro	2.352s (+7.0% 🔺)	2.689s (-5.5% 🟢)	0.000s (~)	3.014s (~)	0.662s	10	22.04x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.817s (-6.4% 🟢)	3.249s (-3.0%)	0.311s (-34.5% 🟢)	4.049s (-5.7% 🟢)	1.232s	10	1.00x
▲ Vercel	Next.js (Turbopack)	2.850s (-5.6% 🟢)	3.238s (-4.7%)	0.613s (+1.4%)	4.311s (-4.4%)	1.461s	10	1.01x
▲ Vercel	Express	2.865s (-8.0% 🟢)	3.207s (-5.6% 🟢)	0.429s (-14.3% 🟢)	4.137s (-7.8% 🟢)	1.273s	10	1.02x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Express	8/8
🐘 Postgres	Next.js (Turbopack)	8/8
▲ Vercel	Nitro	4/8

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	💻 Local	8/8
Next.js (Turbopack)	🌐 Starter	4/8
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Column Definitions

Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
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TooTallNate · 2025-12-22T20:41:27Z

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vercel · 2026-01-09T18:38:37Z

+      state.resolve();
+      clearInterval(intervalId);
+    }
+  }, LOCK_POLL_INTERVAL_MS);


Multiple concurrent polling intervals could be created if pollWritableLock or pollReadableLock are called multiple times with the same state object, leading to race conditions and resource waste.

@TooTallNate wdyt?

vercel · 2026-01-09T18:38:37Z

+
+/**
+ * Polls a WritableStream to check if the user has released their lock.
+ * Resolves the done promise when lock is released and no pending ops remain.


Race condition in flushablePipe: State can be marked as ended between read() and write(), causing a write attempt to a terminated stream

TooTallNate · 2026-01-09T21:16:40Z

@copilot please review the comments on this PR and implement any suggested changes that seem correct / relevant to you

Copilot · 2026-01-09T21:16:48Z

@TooTallNate I've opened a new pull request, #761, to work on those changes. Once the pull request is ready, I'll request review from you.

…f waiting for stream to close

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Comment thread packages/core/src/serialization.ts Outdated

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TooTallNate force-pushed the 12-20-fix_stream_serialization_to_resolve_when_user_releases_lock_instead_of_waiting_for_stream_to_close branch from a298e32 to 4eedfed Compare January 9, 2026 18:30

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Copilot AI mentioned this pull request Jan 9, 2026

Address PR review feedback: enhance safety, documentation, and test coverage for stream lock detection #761

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pranaygp approved these changes Jan 12, 2026

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TooTallNate added 2 commits January 12, 2026 13:31

Fix stream serialization to resolve when user releases lock instead o…

4c0a1d8

…f waiting for stream to close

.

5cdb799

vercel-release-bot mentioned this pull request Jan 12, 2026

Version Packages (beta) #758

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TooTallNate mentioned this pull request Jan 13, 2026

Streaming timeouts (vercel world) #770

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oabudayyeh mentioned this pull request Feb 5, 2026

Bug: Workflow steps hang until 300s timeout despite completing in seconds #943

Open

ceolinwill mentioned this pull request Mar 25, 2026

Fix step-level getWritable() stream timeout on Vercel #1518

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