[core] Make a duplicate attr_set inert instead of terminal by VaguelySerious · Pull Request #3849 · vercel/workflow

VaguelySerious · 2026-08-27T17:05:23Z

Problem

A workflow-body attribute write draws a correlation id that resolves exactly once: the dispatcher's consumer takes the matching event and deregisters. If the log ends up holding a second attr_set under that id — two replays at the same body position draw the same id, and a World commits both — that second event has no callback left, and never will.

attr_set had no entry in ENTITY_EVENT_CLASS_BY_TYPE, so the duplicate skip could not take it. It is in PARKABLE_EVENT_TYPES, so it was parked instead, waiting for a consumer that cannot come.

Parking is settled by the workflow function returning, and anything still held there is reported through strandedEvent:

Replay finished without consuming event: eventType=attr_set, correlationId=attr_…, eventId=…

So the run did all of its work — every step completed successfully — and then the final replay, the one where the body returns, failed it. Because the log is immutable, every recovery replay reproduced it identically, which burned the whole REPLAY_DIVERGENCE_MAX_RETRIES budget in about a second and terminated the run with CORRUPTED_EVENT_LOG.

This has been observed in production. It is rare (it needs two replays to land on the same drawn attribute id), but when it happens the run is always lost, always at the very end, and always after the user-visible work has already succeeded.

Fix

Give attr_set an entity event class. The straggler then takes skipDuplicateEvent like every other one — committed but inert, which is the invariant duplicate-events.test.ts already documents for step_created / step_started / wait_created.

Parking still covers the case it was added for: an attr_set the walk reaches before the body has made the call that claims it. That one is a first arrival, still owed to a consumer, and is unaffected.

An attribute write from a step body carries no correlation id and is claimed by the structural lifecycle consumer in workflow.ts on the way past, so it is consumed rather than skipped, and several of them never collapse into one class.

Tests

Three, all failing before the change except the guard:

events-consumer.test.ts — a second attr_set for a resolved id is skipped, reports through onDuplicateEvent, leaves nothing stranded, and the walk still reaches the event after it.
events-consumer.test.ts — a first-arrival attr_set with no subscriber yet still parks and is still claimable by a late subscriber (guards against the skip swallowing it; passes before and after).
duplicate-events.test.ts — drives the real setAttributes primitive against a log holding the duplicate, and asserts strandedEvent is undefined once the body returns. This is the exact predicate workflow.ts evaluates.

packages/core 2284 passed, packages/world 165 passed.

Note

This is the read side. The write side — a World committing two events under one drawn id — is worth closing separately; this change means a run survives it either way.

A workflow-body attribute write draws a correlation id that resolves exactly once: the dispatcher's consumer takes the matching event and deregisters. A second event under that id therefore has no callback left and never will. `attr_set` had no entry in ENTITY_EVENT_CLASS_BY_TYPE, so the duplicate skip could not take it, and `PARKABLE_EVENT_TYPES` does list the type, so it was parked for a consumer that could never come. Parking is settled by the workflow function returning, and a survivor there is reported through `strandedEvent` as a replay divergence. So the run did all of its work, every step succeeded, and the final replay failed it, deterministically enough to burn the whole replay-divergence recovery budget and terminate with CORRUPTED_EVENT_LOG. Give `attr_set` a class so the straggler is skipped like every other one: committed but inert. Parking still covers the first arrival, for a replay that walks past an attribute event before the body reaches the call that claims it. An attribute write from a step body carries no correlation id and is consumed by the structural lifecycle consumer, so it is unaffected. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

changeset-bot · 2026-08-27T17:05:28Z

🦋 Changeset detected

Latest commit: 0d4612c

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

This PR includes changesets to release 20 packages

Name	Type
@workflow/world	Patch
@workflow/core	Patch
@workflow/web-shared	Patch
@workflow/cli	Patch
@workflow/vitest	Patch
@workflow/web	Patch
@workflow/world-local	Patch
@workflow/world-postgres	Patch
@workflow/world-testing	Patch
@workflow/world-vercel	Patch
@workflow/builders	Patch
@workflow/next	Patch
@workflow/nitro	Patch
workflow	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
@workflow/nuxt	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

vercel · 2026-08-27T17:05:32Z

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

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, v0	Aug 28, 2026 3:44am
example-nextjs-workflow-webpack	Ready	Preview, v0	Aug 28, 2026 3:44am
example-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-astro-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-express-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-fastify-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-hono-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-nestjs-workflow	Building	Preview, v0	Aug 28, 2026 3:44am
workbench-nitro-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-nuxt-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-python-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-sveltekit-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-tanstack-start-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workbench-vite-workflow	Ready	Preview, v0	Aug 28, 2026 3:44am
workflow-docs	Ready	Preview, v0	Aug 28, 2026 3:44am
workflow-swc-playground	Ready	Preview, v0	Aug 28, 2026 3:44am
workflow-tarballs	Ready	Preview, v0	Aug 28, 2026 3:44am
workflow-web	Ready	Preview, v0	Aug 28, 2026 3:44am

github-actions · 2026-08-27T17:05:48Z

🧪 E2E Test Results

❌ Some tests failed

❌ Failed E2E Tests

▲ Vercel Production (8 failed)

python-node (8 failed):

promiseAllWorkflow | wrun_41M137DB0Z0GSZVZQWF453F97C | 🔍 observability
sleepingWorkflow | wrun_41M137E00W0GZ6HK7KMHM1JJYE | 🔍 observability
parallelSleepWorkflow | wrun_41M137E0HC0GYP2AECXVESWXZZ | 🔍 observability
nullByteWorkflow | wrun_41M137E6XE0GTYGZQ4MQ8TMRR0 | 🔍 observability
cancelRun - cancelling a running workflow | wrun_41M137JV5R0GKRE06R1ZB0QB3Y | 🔍 observability
cancelRun via CLI - cancelling a running workflow | wrun_41M137JWTA0GQK7AJ51FTFSEGD | 🔍 observability
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M137K6AZ0GT2H9D2XAMG80BB | 🔍 observability
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M137KS3R0GYJ16X6WCSCVPV7 | 🔍 observability

💻 Local Development (1 failed)

vite-stable-quickjs (1 failed):

hookWorkflow | wrun_41M137DPTT0GMYWAKK6V3ABTWR

🌐 Cross-language Conformance (9 failed)

python (9 failed):

deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M137QNVX2Z3VVS0J18VWTMYH
promiseAllWorkflow | wrun_41M137DB0Z0GSZVZQWF453F97C
sleepingWorkflow | wrun_41M137E00W0GZ6HK7KMHM1JJYE
parallelSleepWorkflow | wrun_41M137E0HC0GYP2AECXVESWXZZ
nullByteWorkflow | wrun_41M137E6XE0GTYGZQ4MQ8TMRR0
cancelRun - cancelling a running workflow | wrun_41M137JV5R0GKRE06R1ZB0QB3Y
cancelRun via CLI - cancelling a running workflow | wrun_41M137JWTA0GQK7AJ51FTFSEGD
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M137K6AZ0GT2H9D2XAMG80BB
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M137KS3R0GYJ16X6WCSCVPV7

⚠️ Flaky E2E Tests (passed on retry)

These tests failed at least once and passed on a retry. A recurring entry here is a real race worth investigating.

addTenWorkflow (tanstack-start)
cancelRun via CLI - cancelling a running workflow (nitro)
hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-turbopack)
hookWithSleepWorkflow - hook payloads delivered correctly with concurrent sleep (nextjs-webpack)

🛠 Infra Events (absorbed by the harness)

Platform anomalies the e2e harness detected and worked around (e.g. a run the queue never picked up, replaced by a fresh run). Clustered timestamps indicate a backend blip; a steady drip indicates a platform issue worth escalating.

35 infra events

cold-start-warmup · suite warmup (python) · at 03:44:40Z · abandoned wrun_41M137CV8S0GMABW1139YA39K4 · (+7 more)
run-pickup-stall · promiseAllWorkflow (python) · at 03:44:57Z · abandoned wrun_41M137GFZA0GPXQHK559K6EWKG
run-pickup-stall · nullByteWorkflow (python) · at 03:44:57Z · abandoned wrun_41M137GFZK0GN3AX7529TH8E4D
run-pickup-stall · parallelSleepWorkflow (python) · at 03:44:57Z · abandoned wrun_41M137GFZG0GM2ESHWFMWC4Q6R
run-pickup-stall · sleepingWorkflow (python) · at 03:44:57Z · abandoned wrun_41M137GFZG0GM2ESHWFMWC4Q6Q
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 03:44:57Z · abandoned wrun_41M137GGAP0GRBF19QDPGX79NF
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 03:45:30Z · abandoned wrun_41M137HG1V0GWSHVA0705528EM
run-pickup-stall · nullByteWorkflow (python) · at 03:45:57Z · abandoned wrun_41M137JBAR0GZBRBD0QAE0AADX
run-pickup-stall · parallelSleepWorkflow (python) · at 03:45:57Z · abandoned wrun_41M137JBB20GMM32YA0DV72X2N
run-pickup-stall · promiseAllWorkflow (python) · at 03:45:57Z · abandoned wrun_41M137JBDY0GRA0RA6MS8H0YRV
run-pickup-stall · sleepingWorkflow (python) · at 03:45:57Z · abandoned wrun_41M137JBA90GQ07Q4BDQA5RMFP
cold-start-warmup · suite warmup (tanstack-start) · at 03:46:28Z · abandoned wrun_01M137JY56V2MSNF1WMSDSWZC8
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 03:46:48Z · abandoned wrun_41M137JFTA0GVFMJNMSQE7VXRW
cold-start-warmup · suite warmup (python) · at 03:47:21Z · abandoned wrun_01M137HQE5631W03G7Q54MRS10 · (+7 more)
run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 03:47:36Z · abandoned wrun_01M137NCJVSV4SVXEQ35F6JPF1
run-pickup-stall · nullByteWorkflow (python) · at 03:47:36Z · abandoned wrun_01M137NCK5KB79EDW45M3T0HDT
run-pickup-stall · promiseAllWorkflow (python) · at 03:47:36Z · abandoned wrun_01M137NCJVSV4SVXEQ35F6JPF2
run-pickup-stall · sleepingWorkflow (python) · at 03:47:36Z · abandoned wrun_01M137NCK1GB4EHD5GXNEP952R
run-pickup-stall · parallelSleepWorkflow (python) · at 03:47:36Z · abandoned wrun_01M137NCK23NMP8RCVMXP8VVKZ
run-pickup-stall · stepFunctionAsStartArgWorkflow - step function reference passed as start() argument (nuxt) · at 03:47:54Z · abandoned wrun_01M137NYKP2QJW2KNPSE7PT5KZ
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 03:48:29Z · abandoned wrun_41M137N7PW0GSEQTCAYWE1P3CE
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 03:48:29Z · abandoned wrun_41M137N36W0GY1VQXX2E9ZGT2V
run-pickup-stall · promiseAllWorkflow (python) · at 03:48:36Z · abandoned wrun_01M137Q76MZVV9JC55G9D8A0E8
run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 03:48:36Z · abandoned wrun_01M137Q76HHVGJ9706NB0WDGR5
run-pickup-stall · sleepingWorkflow (python) · at 03:48:36Z · abandoned wrun_01M137Q76PJP7KDJN99A3MNXFS
run-pickup-stall · parallelSleepWorkflow (python) · at 03:48:36Z · abandoned wrun_01M137Q76SVEQS7VPXNEN3CQF6
run-pickup-stall · nullByteWorkflow (python) · at 03:48:36Z · abandoned wrun_01M137Q76YMKTC7Z2FYDVASH6J
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 03:49:36Z · abandoned wrun_01M137S1T825AZ6T1PK2MJZXD2
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 03:49:36Z · abandoned wrun_01M137S1TPZBKNBVYFAYAP2JP1
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 03:49:36Z · abandoned wrun_01M137S1TJ2AMTG1HWPD22BF4A
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 03:50:06Z · abandoned wrun_01M137SZ64EH3HSMC70A8ZT3H9
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 03:50:06Z · abandoned wrun_01M137SZ657ZYCB7CK2D7FJ17V
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 03:50:36Z · abandoned wrun_01M137TWDTMZ71ZZVQ99BZZ1NR
run-pickup-stall · hookCleanupTestWorkflow - hook token reuse after workflow completion (nextjs-webpack) · at 03:53:05Z · abandoned wrun_01M137ZDZP1Z5GZ7TGN6P7SEMR
run-pickup-stall · concurrent hook token conflict - two workflows cannot use the same hook token simultaneously (nextjs-webpack) · at 03:53:07Z · abandoned wrun_01M137ZGA96XG0R82YX2Z6RMB7

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
❌ ▲ Vercel Production	3570	8	742	4320
❌ 💻 Local Development	3921	1	558	4480
✅ 📦 Local Production	3922	0	558	4480
✅ 🐘 Local Postgres	3922	0	558	4480
✅ 🪟 Windows	320	0	0	320
❌ 🌐 Cross-language Conformance	0	9	132	141
✅ vercel-http-transport	817	0	143	960
✅ vercel-multi-region	27	0	0	27
✅ vercel-ws-transport	553	0	87	640
Total	17052	18	2778	19848

Details by Category

❌ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro-node	132	0	28
✅ astro-quickjs	132	0	28
✅ example-node	132	0	28
✅ example-quickjs	132	0	28
✅ express-node	132	0	28
✅ express-quickjs	132	0	28
✅ fastify-node	132	0	28
✅ fastify-quickjs	132	0	28
✅ hono-node	132	0	28
✅ hono-quickjs	132	0	28
✅ nest-node	132	0	28
✅ nest-quickjs	132	0	28
✅ nextjs-turbopack-node	157	0	3
✅ nextjs-turbopack-quickjs	157	0	3
✅ nextjs-webpack-node	157	0	3
✅ nextjs-webpack-quickjs	157	0	3
✅ nitro-node	132	0	28
✅ nitro-quickjs	132	0	28
✅ nuxt-node	132	0	28
✅ nuxt-quickjs	132	0	28
❌ python-node	0	8	152
✅ sveltekit-node	151	0	9
✅ sveltekit-quickjs	151	0	9
✅ tanstack-start-node	132	0	28
✅ tanstack-start-quickjs	132	0	28
✅ vite-node	132	0	28
✅ vite-quickjs	132	0	28

❌ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable-node	134	0	26
✅ astro-stable-quickjs	134	0	26
✅ express-stable-node	134	0	26
✅ express-stable-quickjs	134	0	26
✅ fastify-stable-node	134	0	26
✅ fastify-stable-quickjs	134	0	26
✅ hono-stable-node	134	0	26
✅ hono-stable-quickjs	134	0	26
✅ nest-stable-node	134	0	26
✅ nest-stable-quickjs	134	0	26
✅ nextjs-turbopack-canary-node	141	0	19
✅ nextjs-turbopack-canary-quickjs	141	0	19
✅ nextjs-turbopack-stable-node	160	0	0
✅ nextjs-turbopack-stable-quickjs	160	0	0
✅ nextjs-webpack-canary-node	141	0	19
✅ nextjs-webpack-canary-quickjs	141	0	19
✅ nextjs-webpack-stable-node	160	0	0
✅ nextjs-webpack-stable-quickjs	160	0	0
✅ nitro-stable-node	134	0	26
✅ nitro-stable-quickjs	134	0	26
✅ nuxt-stable-node	134	0	26
✅ nuxt-stable-quickjs	134	0	26
✅ sveltekit-stable-node	153	0	7
✅ sveltekit-stable-quickjs	153	0	7
✅ tanstack-start-node	134	0	26
✅ tanstack-start-quickjs	134	0	26
✅ vite-stable-node	134	0	26
❌ vite-stable-quickjs	133	1	26

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable-node	134	26
✅ astro-stable-quickjs	134	26
✅ express-stable-node	134	26
✅ express-stable-quickjs	134	26
✅ fastify-stable-node	134	26
✅ fastify-stable-quickjs	134	26
✅ hono-stable-node	134	26
✅ hono-stable-quickjs	134	26
✅ nest-stable-node	134	26
✅ nest-stable-quickjs	134	26
✅ nextjs-turbopack-canary-node	141	19
✅ nextjs-turbopack-canary-quickjs	141	19
✅ nextjs-turbopack-stable-node	160	0
✅ nextjs-turbopack-stable-quickjs	160	0
✅ nextjs-webpack-canary-node	141	19
✅ nextjs-webpack-canary-quickjs	141	19
✅ nextjs-webpack-stable-node	160	0
✅ nextjs-webpack-stable-quickjs	160	0
✅ nitro-stable-node	134	26
✅ nitro-stable-quickjs	134	26
✅ nuxt-stable-node	134	26
✅ nuxt-stable-quickjs	134	26
✅ sveltekit-stable-node	153	7
✅ sveltekit-stable-quickjs	153	7
✅ tanstack-start-node	134	26
✅ tanstack-start-quickjs	134	26
✅ vite-stable-node	134	26
✅ vite-stable-quickjs	134	26

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable-node	134	26
✅ astro-stable-quickjs	134	26
✅ express-stable-node	134	26
✅ express-stable-quickjs	134	26
✅ fastify-stable-node	134	26
✅ fastify-stable-quickjs	134	26
✅ hono-stable-node	134	26
✅ hono-stable-quickjs	134	26
✅ nest-stable-node	134	26
✅ nest-stable-quickjs	134	26
✅ nextjs-turbopack-canary-node	141	19
✅ nextjs-turbopack-canary-quickjs	141	19
✅ nextjs-turbopack-stable-node	160	0
✅ nextjs-turbopack-stable-quickjs	160	0
✅ nextjs-webpack-canary-node	141	19
✅ nextjs-webpack-canary-quickjs	141	19
✅ nextjs-webpack-stable-node	160	0
✅ nextjs-webpack-stable-quickjs	160	0
✅ nitro-stable-node	134	26
✅ nitro-stable-quickjs	134	26
✅ nuxt-stable-node	134	26
✅ nuxt-stable-quickjs	134	26
✅ sveltekit-stable-node	153	7
✅ sveltekit-stable-quickjs	153	7
✅ tanstack-start-node	134	26
✅ tanstack-start-quickjs	134	26
✅ vite-stable-node	134	26
✅ vite-stable-quickjs	134	26

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack-node	160	0	0
✅ nextjs-turbopack-quickjs	160	0	0

❌ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
❌ python	0	9	132

✅ vercel-http-transport

App	Passed	Skipped
✅ example	132	28
✅ express	132	28
✅ hono	132	28
✅ nextjs-turbopack	157	3
✅ nitro	132	28
✅ vite	132	28

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

✅ vercel-ws-transport

App	Passed	Skipped
✅ example	132	28
✅ express	132	28
✅ nextjs-turbopack	157	3
✅ vite	132	28

📋 View full workflow run

github-actions · 2026-08-27T17:05:56Z

📊 Workflow Benchmarks

commit 0d4612c · Fri, 28 Aug 2026 04:06:20 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	191 (+1.6%)	1236 🔴 (+11%)	1309 🔴 (+14%)	1785 🔴 (+23%) 🔻	30
TTFS	stream	199 (+24%) 🔻	1440 🔴 (+28%) 🔻	1456 🔴 (+26%) 🔻	1643 🔴 (+21%) 🔻	30
TTFS	hook + stream	1543 (+29%) 🔻	1630 🔴 (+17%) 🔻	1669 🔴 (+15%) 🔻	2202 🔴 (+44%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	589 (-9.4%)	2011 (+14%)	2027 (+5.5%)	2039 (-3.2%)	10
Fan-out TTLS	Promise.all(100 steps)	1943 (+4.1%)	3912 (+5.2%)	3939 (+3.4%)	4227 (-39%) 💚	10
STSO	1020 steps (inline)	100 (-8.3%)	145 (-8.8%)	161 (-13%)	277 (-3.1%)	1019
WO	1020 steps	146048 (-5.0%)	146048 (-5.0%)	146048 (-5.0%)	146048 (-5.0%)	1
CRTT	first chunk (pooled)	94 (-1.1%)	151 (-5.0%)	197 (-1.0%)	278 (-17%) 💚	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	123 (-10%)	159 (-13%)	263 (+6%)	420 (-23%)	152 (-17%)	10
size sweep (100/s, 160B-12KB)	122 (-7%)	161 (-24%)	275 (-53%)	579 (-35%)	142 (-33%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	188 (+38%)	119 (-33%)	161 (-33%)	365 (-12%)	331 (+1%)	3
replay eve-gpt-5.6-sol-2000t (1x)	112 (-22%)	132 (-29%)	183 (-36%)	567 (-17%)	411 (-35%)	2
replay eve-gpt-5.6-sol-2000t (2x)	120 (-20%)	196 (-22%)	355 (-31%)	676 (-28%)	269 (-43%)	3

📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 153650ms → this run 144769ms (Δ -8881ms, -6%)

100-150 ms  ████████████████████░░░┃  main 681  this 818  +137
150-200 ms  ████┃███                  main 264  this 176   -88
200-250 ms  ┃█                        main  52  this  11   -41
250-300 ms  ┃                         main  15  this   6    -9
300-350 ms  ┃                         main   5  this   3    -2
350-400 ms  ┃                         main   2  this   2    +0
400-450 ms  ┃                         main   0  this   2    +2
500-550 ms  ┃                         main   0  this   1    +1

📈 CRTT drill-down vs main (RTT distributions & profiles)

variant  RTT 1ms→5s+             avg         p50         p90         p99     n
control  ······▅█▂····    129 (-16%)  112 (-19%)   263 (+6%)  420 (-23%)  3000
sweep    ······▆█▂▁···    128 (-32%)  110 (-19%)  275 (-53%)  579 (-35%)  3000
gw 1x    ·····▁█▇▁▁···  106.6 (-28%)   98 (-27%)  161 (-33%)  365 (-12%)  5295
eve 1x   ·····▁██▂▁···  122.2 (-24%)   99 (-28%)  183 (-36%)  567 (-17%)  5186
eve 2x   ·····▁▃█▃▁···  157.3 (-29%)  129 (-26%)  355 (-31%)  676 (-28%)  7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):

control  █▄▅▄▁▁▁▂▂▁  111–174ms
sweep    ▅█▃▂▆▆▁▆▆▂  113–144ms
gw 1x    █▂▆▅▂▁▁▂▃▃  95–133ms
eve 1x   ▂▁▂▄▂▃▅█▄▁  93–192ms
eve 2x   ▃▁▁▂▂▂▃█▄▂  120–259ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):

sweep  ▃▄█▇▄▁▁  126–131ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):

control  █▅▆▅▁▂▄▃▆▄  34–43ms
sweep    ▄▁▂▅█▄▄▅▄▆  35–60ms
gw 1x    █▁▆▃▂▄▂▂▃▂  26–38ms
eve 1x   ▁▂▁▁▂▃█▆▄▂  20–32ms
eve 2x   ▇▃▁▂▄▅▄▅▃█  19–32ms

📜 Previous results (1)

`20f051f`

Thu, 27 Aug 2026 17:22:14 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1215 (+232%) 🔻	1292 🔴 (+13%)	1335 🔴 (+8.1%)	1420 🔴 (-1.2%)	30
TTFS	stream	1207 (+391%) 🔻	1272 🔴 (+13%)	1292 🔴 (+13%)	1319 🔴 (-8.3%)	30
TTFS	hook + stream	475 (+1.3%)	1578 🔴 (+12%)	1677 🔴 (+16%) 🔻	6061 🔴 (+222%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	536 (-13%)	814 (-4.5%)	1868 (+98%) 🔻	1989 (+19%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	1873 (-13%)	2446 (-10%)	3880 (+35%) 🔻	8850 (+25%) 🔻	10
STSO	1020 steps (inline)	92 (-9.8%)	121 (-27%) 💚	142 (-26%) 💚	186 (-33%) 💚	1019
WO	1020 steps	120940 (-23%) 💚	120940 (-23%) 💚	120940 (-23%) 💚	120940 (-23%) 💚	1
CRTT	first chunk (pooled)	88 (-18%) 💚	115 (-30%) 💚	139 (-35%) 💚	250 (-60%) 💚	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	113 (-14%)	126 (-40%)	199 (-56%)	989 (+35%)	134 (-65%)	10
size sweep (100/s, 160B-12KB)	97 (-39%)	113 (-67%)	144 (-76%)	276 (-64%)	105 (-42%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	113 (-24%)	107 (-43%)	140 (-51%)	255 (-54%)	134 (-72%)	3
replay eve-gpt-5.6-sol-2000t (1x)	121 (-9%)	123 (-24%)	263 (+20%)	3461 (+300%)	1981 (+239%)	2
replay eve-gpt-5.6-sol-2000t (2x)	113 (-20%)	148 (-41%)	201 (-48%)	485 (-22%)	334 (+9%)	3

ℹ️ Metric definitions & methodology

_{Streams: first-chunk RTT (the stream-open path, before any buffering/backpressure), CRTT percentiles, and worst delivery stall (CDV max). Cells are medians across iterations; per-run values in the artifacts. No 🔴/🟢 marks until targets attach.}

_{The collapsed STSO distribution section above buckets every step gap, split inline (same warm process — pure framework overhead) vs queue-hop (fresh process — dispatch, reinit, replay). █ = main, ┃ = this run, ░ = fill.}

_{The collapsed CRTT drill-down: per-variant RTT histograms (fixed log bins, · = empty) and mean RTT/positive-CDV profile lines over stream progress and chunk size. Histograms, avgs, and profiles merge exactly across runs; p50–p99 are percentile-of-percentiles. Per-index rows live in the artifacts.}

_{Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.}

_{Metrics — TTFS: time to first step body (in-deployment start() → first step body) · Fan-out TTFS: fan-out time to first step (in-deployment start() → first of the parallel step bodies to complete) · Fan-out TTLS: fan-out time to last step (in-deployment start() → last of the parallel step bodies to complete, i.e. when the Promise.all resolves) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · CRTT: chunk round-trip time (per-chunk write → read latency, one clock domain: deployment → stream backend → same deployment) · CDV: chunk delay variation / delivery jitter (inter-arrival gap minus inter-write gap per seq-adjacent pair; skew-free; the row is each run's MAX positive value, so one stall moves it)}

_{Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · Promise.all(100 steps): 100 trivial no-op steps started together in a single Promise.all; Fan-out TTFS is the first of them to complete and Fan-out TTLS the last, both from the in-deployment clientStart, so their gap is the spread the runtime adds across the fan-out · paced control (100/s, 60B): the control: 300 tiny (~60B) deltas metronome-paced at 100/s — zero workload structure, so it reads the transport floor and flush cadence, and disambiguates transport-wide vs workload-specific when a replay row moves · size sweep (100/s, 160B-12KB): same pacing as the control with deltas padded in rotation across seven log-spaced sizes (~160B–12KB) — rotation decouples size from stream position, so it isolates whether chunk size causes latency · replay gateway-gpt-5.4-nano-2000t (1x): raw provider SSE cadence captured at the AI gateway boundary (gpt-5.4-nano, the most popular gateway model; per-token deltas p50 208B = the modal production chunk size), replayed exactly as measured — the typical customer's workload; its CDV is the typical customer's real delivery jitter · replay eve-gpt-5.6-sol-2000t (1x): a captured eve turn (gpt-5.6-sol, the most-used demanding eve model; ~2000 output tokens = production p50 turn length) replayed exactly as measured — eve's envelope protocol re-ships the cumulative message so sizes ramp 142B→13KB; the demanding outlier tenant's reality · replay eve-gpt-5.6-sol-2000t (2x): the same eve capture at 2x — the headroom/stress row; real fast-tier models emit the same chunk sizes at proportionally higher rate, so time compression is a faithful speed model · first chunk (pooled): every run's seq-0 RTT pooled across all stream scenarios — the first chunk precedes any workload differentiation, so pooling samples one shared stream-open path with exact percentiles}

_{Replay cadences (semantic sha256) — eve-gpt-5.6-sol-2000t eaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t 6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041}

_{🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600}

_{All timestamps are deployment-side; runs are triggered in-deployment, so the CI runner and api.vercel.com sit outside every measured window. TTFS = start() → first step body (includes dispatch + any cold start); Fan-out TTFS/TTLS = first/last step completion of one Promise.all from the same anchor (the gap is the runtime’s fan-out spread); STSO/WO between step bodies; CRTT inside the workflow (excludes the api.vercel.com read path).}

_{Cold starts stay in the numbers (real bursty-workload latency, inflates P75+); Best is the warm floor.}

github-actions · 2026-08-27T17:09:12Z

Sim World

Simulated world deterministic testing for races. Traces

🟠 world-sim scenario book — 1 fail of 41 total

fence=per-spec

scenario	outcome	events	virt	replay
✅ `smoke-no-steps`	completed	3	0ms	ok
✅ `smoke-one-step`	completed	6	0ms	ok
✅ `hook-at-step-started`	completed	12	0ms	ok
✅ `hook-at-step-completed`	completed	12	0ms	ok
✅ `hook-at-hook-created`	completed	12	0ms	ok
✅ `deadline-hook-wins`	completed	7	1.0h	ok
✅ `deadline-expires`	completed	7	1.0h	ok
✅ `long-sleep`	completed	11	30.0d	ok
✅ `hook-never-arrives`	stalled	3	0ms	skipped
✅ `step-retries-twice`	completed	10	2.0s	ok
✅ `parallel-steps`	completed	9	0ms	ok
✅ `hook-on-execution-state`	completed	12	0ms	ok
✅ `peek-hook-before-branch`	completed	12	0ms	ok
✅ `peek-hook-after-branch`	completed	12	0ms	ok
✅ `peek-hook-at-registration`	completed	12	0ms	ok
✅ `race-hook-before-probe`	completed	12	0ms	ok
✅ `race-hook-after-probe`	completed	12	0ms	ok
✅ `race-duplicate-delivery`	completed	13	0ms	ok
✅ `attr-hook-before-step`	completed	11	0ms	ok
✅ `attr-hook-after-step`	completed	11	0ms	ok
✅ `attr-from-step-body`	completed	13	0ms	ok
✅ `fork-hook-after-timeout`	completed	14	1.0m	ok
✅ `fork-hook-before-timeout`	completed	14	1.0m	ok
✅ `count-hook-after-timeout`	completed	17	1.0m	ok
✅ `count-hook-before-timeout`	completed	20	1.0m	ok
✅ `stale-read-step-count-fork`	completed	20	1.0m	ok
✅ `stale-read-equal-step-counts`	completed	14	1.0m	ok
✅ `step-vs-step-fork`	completed	12	0ms	ok
✅ `step-vs-step-fork-fenced`	completed	12	0ms	ok
✅ `fence-catches-benign-direction`	completed	12	5ms	ok
✅ `in-flight-before-decision`	completed	17	1.0m	ok
❌ `in-flight-before-decision-counted`	completed	17	1.0m	ok
✅ `in-flight-after-decision`	completed	19	2.0m	ok
✅ `stale-read-step-count-fork-fenced`	completed	20	1.0m	ok
✅ `fork-hook-wins`	completed	13	1.0m	ok
✅ `fork-timeout-wins`	completed	13	1.0m	ok
✅ `unclaimed-payload-under-fork`	completed	17	1.0m	ok
✅ `claimed-payload-under-fork`	completed	17	1.0m	ok
✅ `writers-independent-step-bodies`	completed	12	0ms	ok
✅ `writers-scripted-tempo`	completed	12	0ms	ok
✅ `cancel-mid-step`	cancelled	7	0ms	skipped

Full trace: world-sim.txt

github-actions · 2026-08-27T17:10:05Z

Framework	Flow route	Step reg.	Framework output
hono	200.9 KiB (±0)	40.3 KiB (+22 B)	1.76 MiB (-42 B)
nextjs-turbopack	206.3 KiB (±0)	439 B (±0)	763.3 KiB (-218 B)

About these numbers

Sizes are gzip; parentheses show the change against main.
Flow route and Step reg. gate this job, on raw bytes rather than the gzip shown, at max(2%, 50.0 KiB). Framework output is informational.

0d4612c · run

vercel

Additional Suggestion:

A duplicate attr_set that is parked before its consumer subscribes is never reconciled against the event class recorded when an earlier parked copy is consumed, so it stays parked and strands the run as a CORRUPTED_EVENT_LOG at end of log.

pranaygp

simple change. makes sense to me

The class map alone decides a straggler only where the walk meets it after a consumption recorded the class. When neither copy has a consumer yet both park — the walk steps over the first and re-enters in the same tick, with nothing consumed and so no class recorded — and the drain then claims one and holds the other for a callback that will never be registered. That survivor is `strandedEvent`, which is the CORRUPTED_EVENT_LOG this branch set out to stop, reached by the other road. `dropParkedDuplicates` releases it on the same terms the walk skips one. Not an `attr_set` property: `wait_completed` parks in pairs too, and `ONE_SHOT_EVENT_TYPES` only sees the order where the consumption came first. Giving `attr_set` a class also moved the observability UI, which reads the same `entityEventClass` to grey out events a run passed over. It kept treating the straggler as live, because its terminal-class set had no `attr_set` while the dispatcher's consumer does deregister on the first event under an id. The two now share `classifyEntityEvent` and `TERMINAL_EVENT_CLASSES` rather than each keeping a copy of the rule. That sharing needs the entity rule to be exact, because a step-written `attr_set` carries no correlation id: keyed on the run it would collapse every attribute write a run made into one class, and a captured production log in `__fixtures__` holds forty. `classifyEntityEvent` gives such an event no class at all, so neither side can read the second as a repeat of the first. The shared fixture corpus had nothing for `attr_set`, which is why the drift between the two halves went unseen. It has four now, and each of them fails on both sides without the fix above it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pranaygp · 2026-08-28T03:41:18Z

Took this over to finish it — the bot's suggestion was correct, and chasing it turned up a second gap in a neighbouring codebase. Pushed as 0d4612c.

1. The parked ordering (the bot's finding)

Confirmed and reproduced. The class map decides a straggler only where the walk meets it after a consumption recorded the class. When neither copy has a consumer yet, both park — the walk steps over the first and re-enters in the same tick, with nothing consumed and so no class recorded — and drainParked then claims one and holds the other for a callback that can never be registered. That survivor is strandedEvent, i.e. the same CORRUPTED_EVENT_LOG this branch set out to stop, reached by the other road.

dropParkedDuplicates releases it on the same terms the walk skips one. It is not an attr_set property — wait_completed parks in pairs too, and ONE_SHOT_EVENT_TYPES only covers the order where the consumption came first — so both types have a test.

2. The observability UI stopped agreeing with the runtime

Giving attr_set a class also moved @workflow/web-shared, which reads the same entityEventClass to grey out events a run passed over. It kept rendering the straggler as live, because its terminal-class set had no attr_set while the dispatcher's consumer does deregister on the first event under an id. On the same log: runtime skips events[3], UI reported [].

The two now share classifyEntityEvent and TERMINAL_EVENT_CLASSES from @workflow/world instead of each keeping a copy of the rule.

3. Step-written attribute events must not collapse

That sharing needs the entity rule to be exact. A step-written attr_set carries no correlation id, so keyed on the run it would fold every attribute write a run made into one class — and the captured production log in packages/core/src/__fixtures__/ holds forty. classifyEntityEvent gives such an event no class at all, so neither side can read the second as a repeat of the first. Naively adding attr_set to the UI's terminal set without this closes the run's own entity bucket and truncates the fold at the next run-level event.

Coverage

DUPLICATE_EVENT_FIXTURES had nothing for attr_set, which is why the drift went unseen — that corpus is the thing holding the two halves together. Four fixtures added, plus three consumer tests. Each fails without the fix above it, verified by reverting them one at a time:

revert	fails
`dropParkedDuplicates`	2 consumer tests (`attr_set`, `wait_completed`)
the UI change	2 fixtures, web-shared side
the entity rule	4 fixtures, both sides

Green: core 2291, world 165, web-shared 212, typecheck clean. Sim book unchanged at 41 scenarios / 1 fail — in-flight-before-decision-counted, which fails identically on #3845–#3847 and is a count-guard scenario unrelated to this.

Not done: a sim-world scenario for the duplicate write. Producing a genuine second attr_set under one id needs a way to commit an out-of-band event that the scenario API does not expose, and a scenario built on an indirect stale-read arrangement would be red for reasons other than the one it names. Worth a follow-up if the sim grows that capability.

The two failing checks are both pre-existing: E2E Vercel Prod Tests (python - node) is red on every recent PR, and E2E Python Conformance only ran here because this touches packages/world — it fails on specVersion 7 exceeding the Python SDK's pydantic bound, which wants its own issue.

github-actions · 2026-08-28T18:46:56Z

No backport to stable for 855e479 (AI decision).

This is a genuine correctness fix (a parked duplicate attr_set surfacing as strandedEvent and terminating a completed run with CORRUPTED_EVENT_LOG), but it builds entirely on infrastructure that exists only on main: packages/world/src/event-metadata.ts (entityEventClass/ENTITY_EVENT_CLASS_BY_TYPE), packages/web-shared/src/lib/duplicate-events.ts, and the shared duplicate-event fixtures are all absent from origin/stable, and stable's packages/core/src/events-consumer.ts contains no parking, skipDuplicateEvent, or strandedEvent machinery at all. The defect therefore does not exist on the maintenance line and the change has nothing to apply against; if the underlying duplicate-event tolerance is ever backported, this fix should go with it.

To override, re-run the Backport to stable workflow manually via workflow_dispatch and paste this commit SHA into the ref input:

855e47990c0da35419325da27976bae925afb0e9

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pranaygp merged commit 855e479 into main Aug 28, 2026
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pranaygp deleted the peter/attr-set-duplicate-inert branch August 28, 2026 18:45

This was referenced Aug 28, 2026

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[core] Make a duplicate attr_set inert instead of terminal - #3849

[core] Make a duplicate attr_set inert instead of terminal#3849
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🧪 E2E Test Results

❌ Failed E2E Tests

▲ Vercel Production (8 failed)

💻 Local Development (1 failed)

🌐 Cross-language Conformance (9 failed)

⚠️ Flaky E2E Tests (passed on retry)

🛠 Infra Events (absorbed by the harness)

E2E Test Summary

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📊 Workflow Benchmarks

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Sim World

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pranaygp commented Aug 28, 2026

1. The parked ordering (the bot's finding)

2. The observability UI stopped agreeing with the runtime

3. Step-written attribute events must not collapse

Coverage

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