[e2e] Decay the repro's poke pump instead of stopping at the budget by VaguelySerious · Pull Request #3561 · vercel/workflow

VaguelySerious · 2026-08-14T19:21:07Z

Follow-up to #3558, which landed the poke budget as a hard stop.

The hard stop binds: every local step-storm run spent all 64 pokes, so the back half of a ~160s run got no out-of-band writes. Dropping attempt concurrency to 3 doesn't help (runs finish in 87-96s and still spend it).
The pump now decays to pokeIntervalMs * POKE_DECAY_FACTOR (8) after the budget instead of stopping. Loop gain stays under 1, later rounds still get pressure.
That difference caught a real bug: world-local hit CORRUPTED_EVENT_LOG once in 18 step-storm runs (wrun_01M00SW88YV76AXKXQFX4Y3V1X, 87 pokes, 200s). Three passes of the merged config: zero.
Restored pressure pushes local runs to ~200s, which is 83% of the 240s default, so the local script raises RUN_TIMEOUT_MS to 480000. Exported values and dispatch inputs still win.
Lane results after the merge: step-storm, hook-storm and hook-sleep clean on all three lanes, no stuck runs, step-storm at 148-172s locally against the raised timeout. Every corruption in the run is blocked-branch.
The rendered config line now names the budget and decay (poke budget 64 then /8).

Merged main, which added the blocked-branch scenario (#3696). That scenario corrupts by design and stays red until a fix lands, so the lanes on this PR are red for its reasons, not this one's. Check the per-scenario breakdown: step-storm is the one this PR moves.

Two fixes the merge turned up:

[e2e] Add blocked-branch scenario to the event-log race repro #3696 wired its five blocked-branch inputs into the Vercel job only, so a dispatch tuning that scenario left the two local lanes on harness defaults. Every EVENT_LOG_RACE_REPRO_* knob now reaches both jobs.
The AGENTS.md intro still said three scenarios.

Known gap, not fixed here: local hook-storm straggles ~1 branch per round by arithmetic (index * 400ms stagger vs a 2500ms watchdog), where Vercel gets 18-24 because each resume also pays ~1.5s of network latency. Retuning the local stagger or watchdog needs its own straggler numbers.

PR Checklist - Required to merge

📦 pnpm changeset was run to create a changelog for this PR
🔒 DCO sign-off passes (git commit --signoff)
📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete

🤖 Generated with Claude Code

A hard ceiling bought the lanes their green at the cost of coverage: every step-storm run on both local lanes spent the full 64-poke budget, so the back half of a ~160s run applied no out-of-band writes at all. Lowering attempt concurrency does not help — at c3 runs finish in 87-96s and still spend the whole budget. The pump now slows to `pokeIntervalMs * POKE_DECAY_FACTOR` (8) once the budget is spent rather than stopping, so loop gain stays below 1 while a slow run's later rounds keep receiving pressure. Verified locally at POKE_MAX=4 / 500ms / decay 10: a 26.1s run sent 8 pokes, 4 at full cadence and 4 across the remaining 24s, where unbounded sends ~52 and a hard stop sends 4. The lanes were never comparable on this axis to begin with: a Vercel resume pays a network round trip, so that lane's pump achieves an effective ~2.3s interval (35-44 pokes per run) while localhost runs the full 750ms. The decayed rate is what puts the local lanes near the lane that found the production bug, rather than at 3x its write rate. Also records what the saturated lanes are NOT: world-local logged zero failed deliveries, zero handler errors and zero exhausted messages across three 14-run passes, because its semaphore parks a message before the delivery fetch and queue waiting never consumes the transport timeout. No retry amplification to find. The two default-concurrency smells that did surface (world-local's 1000 in-flight deliveries, world-postgres' 50 workers per process) are noted for their own change, not fixed here. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Peter Wielander <peter.wielander@vercel.com>

With the pump's pressure restored, world-local `step-storm` lands at 194-203s and world-postgres at 168-175s against the harness' 240000 default — 83% of their own timeout — while the Vercel lane finishes the same storm in 85-100s. One slow runner at that margin turns a lane that reproduces into a lane full of `stuck`, which is the failure this branch exists to stop. The local script raises it to 480000. It is the one scale knob the script sets, because it is the one whose meaning depends on every replay of every run sharing a Node process rather than getting its own Fluid invocation; an exported value still wins, and a workflow_dispatch input still wins. Evidence the restored pressure is worth the timeout: on the decay config world-local produced a CORRUPTED_EVENT_LOG (wrun_01M00SW88YV76AXKXQFX4Y3V1X, 87 pokes over 200s), which three passes of the hard-cap config never did. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Peter Wielander <peter.wielander@vercel.com>

Signed-off-by: Peter Wielander <peter.wielander@vercel.com>

changeset-bot · 2026-08-14T19:21:14Z

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Latest commit: 236253d

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vercel · 2026-08-14T19:21:15Z

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 21, 2026 9:44pm
example-nextjs-workflow-webpack	Ready	Preview, v0	Aug 21, 2026 9:44pm
example-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-astro-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-express-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-fastify-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-hono-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-nestjs-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-nitro-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-nuxt-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-python-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-sveltekit-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-tanstack-start-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workbench-vite-workflow	Ready	Preview, v0	Aug 21, 2026 9:44pm
workflow-docs	Ready	Preview, v0	Aug 21, 2026 9:44pm
workflow-swc-playground	Ready	Preview, v0	Aug 21, 2026 9:44pm
workflow-tarballs	Ready	Preview, v0	Aug 21, 2026 9:44pm
workflow-web	Ready	Preview, v0	Aug 21, 2026 9:44pm

github-actions · 2026-08-14T19:21:27Z

🧪 E2E Test Results

❌ Some tests failed

❌ Failed E2E Tests

▲ Vercel Production (251 failed)

astro-node (8 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

astro-quickjs (12 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortAnyInStepWorkflow: AbortSignal.any inside a step composes deserialized signals
AbortController abortListenerWorkflow: signal.addEventListener fires on the deserialized step signal
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

example-node (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

example-quickjs (12 failed):

webhookWorkflow | wrun_41M0K4CVGW0GJNQ7D4FAGR3SE8 | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortFromStepWorkflow: step abort cancels an in-flight sibling step
AbortController abortThrowIfAbortedMidFlightWorkflow: throwIfAborted in a polling loop bails when abort fires
AbortController abortDeterministicBranchFromStepWorkflow: branches stay consistent when abort comes from a step
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting

express-node (7 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
resume-or-start route pattern - resumeHook retried after start() reaches the new run | wrun_41M0K4RRZJ0GW0F7N055T6B4FE | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes validation DX: invalid writes throw catchable FatalErrors naming rule and limit

express-quickjs (11 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortDeterministicBranchFromStepWorkflow: branches stay consistent when abort comes from a step
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands
setAttributes validation DX: invalid writes throw catchable FatalErrors naming rule and limit

fastify-node (7 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

fastify-quickjs (12 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortAnyInStepWorkflow: AbortSignal.any inside a step composes deserialized signals
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands
setAttributes workflow throws after awaited setAttributes: attribute still persists on the failed run

hono-node (9 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
resume-or-start route pattern - resumeHook retried after start() reaches the new run | wrun_41M0K4RRZJ0GW0F7N055T6B4FE | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes workflow throws after awaited setAttributes: attribute still persists on the failed run

hono-quickjs (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
AbortController abortListenerWorkflow: signal.addEventListener fires on the deserialized step signal
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

nest-node (12 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
hookAdoptOwnerResultWorkflow - duplicate adopts the owner result via conflict.returnValue | wrun_41M0K4R4BC0GQDMPMG1R3NM7GZ | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands
setAttributes validation DX: invalid writes throw catchable FatalErrors naming rule and limit

nest-quickjs (14 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortAnyInStepWorkflow: AbortSignal.any inside a step composes deserialized signals
AbortController abortDeterministicBranchFromStepWorkflow: branches stay consistent when abort comes from a step
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands
setAttributes workflow throws after awaited setAttributes: attribute still persists on the failed run
setAttributes validation DX: invalid writes throw catchable FatalErrors naming rule and limit

nextjs-turbopack-node (5 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly

nextjs-turbopack-quickjs (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortThrowIfAbortedMidFlightWorkflow: throwIfAborted in a polling loop bails when abort fires
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting

nextjs-webpack-node (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

nextjs-webpack-quickjs (8 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting

nitro-node (8 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

nitro-quickjs (9 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
AbortController abortDeterministicBranchFromStepWorkflow: branches stay consistent when abort comes from a step
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes workflow throws after awaited setAttributes: attribute still persists on the failed run

nuxt-node (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

nuxt-quickjs (10 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortThrowIfAbortedMidFlightWorkflow: throwIfAborted in a polling loop bails when abort fires
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting

python-node (8 failed):

promiseAllWorkflow | wrun_41M0K4BTJ60GV2HHJ2E9RJDVJG | 🔍 observability
sleepingWorkflow | wrun_41M0K4D4R10GG4JSN35R3HXW9P | 🔍 observability
parallelSleepWorkflow | wrun_41M0K4DVA30GK3XBDF5TAZG945 | 🔍 observability
nullByteWorkflow | wrun_41M0K4E3EF0GMPE61KJRM0CZEN | 🔍 observability
cancelRun - cancelling a running workflow | wrun_41M0K4TWF60GT5VSVK8WCG6J5K | 🔍 observability
cancelRun via CLI - cancelling a running workflow | wrun_41M0K4V1WC0GTTE1608PQARN0X | 🔍 observability
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M0K4VDDH0GJYC1RRD3W0JERJ | 🔍 observability
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M0K4WZVE0GH6SPKWMKS4QABC | 🔍 observability

sveltekit-node (8 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
distributedAbortController - reconnect to existing controller | wrun_41M0K4YDTB0GZWPBH04E9WENFT | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

sveltekit-quickjs (12 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
AbortController abortFromStepWorkflow: step abort cancels an in-flight sibling step
AbortController abortListenerWorkflow: signal.addEventListener fires on the deserialized step signal
AbortController abortDeterministicBranchFromStepWorkflow: branches stay consistent when abort comes from a step
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

tanstack-start-node (6 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

tanstack-start-quickjs (5 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
AbortController abortFromStepWorkflow: step abort cancels an in-flight sibling step
AbortController abortAnyInStepWorkflow: AbortSignal.any inside a step composes deserialized signals

vite-node (7 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
hookAdoptOwnerResultWorkflow - duplicate adopts the owner result via conflict.returnValue | wrun_41M0K4R4BC0GQDMPMG1R3NM7GZ | 🔍 observability
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes fire-and-forget: void setAttributes lands without awaiting

vite-quickjs (11 failed):

hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_41M0K4N5010GR0ZHR7MJ0BDNMH | 🔍 observability
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_41M0K4JFBW0GMT0E6D6Q4ZJP5F | 🔍 observability
hookGetConflictWorkflow - hook.getConflict() resolves with the conflicting run when token is already registered | wrun_41M0K4NKJ10GK2NDACM4ZTHQV5 | 🔍 observability
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable | wrun_41M0K4MF400GTNPRTV3K3KKTE3 | 🔍 observability
AbortController abortAnyInStepWorkflow: AbortSignal.any inside a step composes deserialized signals
setAttributes start: initial attributes are seeded on run creation
setAttributes start: reserved-prefix initial attributes are seeded with allowReservedAttributes
setAttributes setAttributesWorkflow: workflow-body calls append native attr_set events and merge correctly
setAttributes setAttributesInsideStepWorkflow: step-body calls append attributed native events
setAttributes fire-and-forget: void setAttributes lands without awaiting
setAttributes Promise.all of disjoint-key writes: every key lands

🪟 Windows (1 failed)

nextjs-turbopack-quickjs (1 failed):

cancelRun via CLI - cancelling a running workflow | wrun_41M0K4V1WC0GTTE1608PQARN0X

🌐 Cross-language Conformance (9 failed)

python (9 failed):

deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M0K4PGQWWAKNZSK73GYSJC49
promiseAllWorkflow | wrun_41M0K4BTJ60GV2HHJ2E9RJDVJG
sleepingWorkflow | wrun_41M0K4D4R10GG4JSN35R3HXW9P
parallelSleepWorkflow | wrun_41M0K4DVA30GK3XBDF5TAZG945
nullByteWorkflow | wrun_41M0K4E3EF0GMPE61KJRM0CZEN
cancelRun - cancelling a running workflow | wrun_41M0K4TWF60GT5VSVK8WCG6J5K
cancelRun via CLI - cancelling a running workflow | wrun_41M0K4V1WC0GTTE1608PQARN0X
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M0K4VDDH0GJYC1RRD3W0JERJ
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M0K4WZVE0GH6SPKWMKS4QABC

⚠️ 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.

29 flaky tests

abortListenerWorkflow: signal.addEventListener fires on the deserialized step signal (nitro)
addTenWorkflow (hono)
cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously (express)
distributedAbortController - manual abort triggers signal (sveltekit)
distributedAbortController - manual abort triggers signal (tanstack-start)
distributedAbortController - reconnect to existing controller (vite)
hookAdoptOwnerResultWorkflow - duplicate adopts the owner result via conflict.returnValue (express)
hookAdoptOwnerResultWorkflow - duplicate adopts the owner result via conflict.returnValue (nextjs-webpack)
hookAdoptOwnerResultWorkflow - duplicate adopts the owner result via conflict.returnValue (tanstack-start)
hookClaimOnlyMutexWorkflow - hook works as a pure run mutex without payload data (nextjs-webpack)
hookDisposeTestWorkflow - hook token reuse after explicit disposal while workflow still running (nextjs-webpack)
hookGetConflictThenStepParallelWorkflow - hook.getConflict() continuation step runs alongside other steps (nextjs-webpack)
hookMinRetentionWorkflow - terminal Hook cannot resume and its token stays unavailable (sveltekit)
parallelStepsThenWebhookWorkflow - no hook_conflict from same-tick replay race (express)
parallelStepsThenWebhookWorkflow - no hook_conflict from same-tick replay race (nitro)
Promise.all of disjoint-key writes: every key lands (astro)
Promise.all of disjoint-key writes: every key lands (express)
resume-or-start route pattern - resumeHook retried after start() reaches the new run (astro)
resume-or-start route pattern - resumeHook retried after start() reaches the new run (nextjs-webpack)
resume-or-start route pattern - resumeHook retried after start() reaches the new run (tanstack-start)
setAttributesInsideStepWorkflow: step-body calls append attributed native events (astro)
setAttributesInsideStepWorkflow: step-body calls append attributed native events (tanstack-start)
setAttributesInsideStepWorkflow: step-body calls append attributed native events (vite)
validation DX: invalid writes throw catchable FatalErrors naming rule and limit (nextjs-webpack)
webhookWorkflow (nextjs-webpack)
workflow throws after awaited setAttributes: attribute still persists on the failed run (nextjs-webpack)
workflow throws after awaited setAttributes: attribute still persists on the failed run (nitro)
workflow throws after awaited setAttributes: attribute still persists on the failed run (tanstack-start)

🛠 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.

32 infra events

cold-start-warmup · suite warmup (python) · at 21:43:13Z · abandoned wrun_41M0K4ANN90GQZ6Z4B1D2K7DTY · (+7 more)
run-pickup-stall · parallelSleepWorkflow (python) · at 21:43:29Z · abandoned wrun_41M0K4EAJC0GGB5PW97CV62SC5
run-pickup-stall · nullByteWorkflow (python) · at 21:43:29Z · abandoned wrun_41M0K4EAJE0GMSQ2XADVNZ28NK
run-pickup-stall · sleepingWorkflow (python) · at 21:43:29Z · abandoned wrun_41M0K4EAJC0GGB5PW97CV62SC4
run-pickup-stall · promiseAllWorkflow (python) · at 21:43:29Z · abandoned wrun_41M0K4EAJ80GREVZJHWPHBVWGR
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:43:29Z · abandoned wrun_41M0K4EAWY0GJH56E6HNWBF06W
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:44:01Z · abandoned wrun_41M0K4FA9Z0GGGGRMSP4ZY20E7
run-pickup-stall · parallelSleepWorkflow (python) · at 21:44:30Z · abandoned wrun_41M0K4G5Z70GHG7YGWG0N8FB2E
run-pickup-stall · promiseAllWorkflow (python) · at 21:44:30Z · abandoned wrun_41M0K4G5YR0GWCR0RSP0N2XMQ0
run-pickup-stall · nullByteWorkflow (python) · at 21:44:30Z · abandoned wrun_41M0K4G61T0GJ26P59PMC21P59
run-pickup-stall · sleepingWorkflow (python) · at 21:44:30Z · abandoned wrun_41M0K4G5W80GT9XQ44CX90XTVT
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:45:21Z · abandoned wrun_41M0K4G9P60GJ02XPYPW69RYKE
cold-start-warmup · suite warmup (python) · at 21:46:26Z · abandoned wrun_01M0K4GJA3MHHTHYBARY694XRN · (+7 more)
run-pickup-stall · promiseAllWorkflow (python) · at 21:46:41Z · abandoned wrun_01M0K4M7EXKGEG2STVEE13JKSP
run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:46:41Z · abandoned wrun_01M0K4M7EW2B08G0T7RCDSRWMC
run-pickup-stall · sleepingWorkflow (python) · at 21:46:41Z · abandoned wrun_01M0K4M7F2Y6XQCT33XPCM0HB4
run-pickup-stall · nullByteWorkflow (python) · at 21:46:41Z · abandoned wrun_01M0K4M7F6T3VTZZC53570CP5V
run-pickup-stall · parallelSleepWorkflow (python) · at 21:46:41Z · abandoned wrun_01M0K4M7F4K5B87CRZPG5YMWNV
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:47:01Z · abandoned wrun_41M0K4JXRT0GNYA1WCTRC241GS
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:47:01Z · abandoned wrun_41M0K4J7BJ0GQEG39HJZRGYCKP
cold-start-warmup · suite warmup (tanstack-start) · at 21:47:26Z · abandoned wrun_01M0K4N71DSRP368E97WK351VM
run-pickup-stall · promiseAllWorkflow (python) · at 21:47:41Z · abandoned wrun_01M0K4P22PVMQQYYQARTYFTYEQ
run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:47:41Z · abandoned wrun_01M0K4P22MBWBBHYHR8NYTKCYC
run-pickup-stall · parallelSleepWorkflow (python) · at 21:47:41Z · abandoned wrun_01M0K4P22SCY9JSSSW1V5A54E2
run-pickup-stall · sleepingWorkflow (python) · at 21:47:41Z · abandoned wrun_01M0K4P22V4M7SFD8AK3K7Q2X6
run-pickup-stall · nullByteWorkflow (python) · at 21:47:41Z · abandoned wrun_01M0K4P22ZBBZQRQ8RTTWXDF53
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:48:41Z · abandoned wrun_01M0K4QWPCZFQG9K4Z2C2HB382
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:48:41Z · abandoned wrun_01M0K4QWPKS392B46H25GTFRYJ
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:48:41Z · abandoned wrun_01M0K4QWPQ4BR2EX1DARHQZWQ2
run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:49:11Z · abandoned wrun_01M0K4RT22E1B8JM0RV9FBEXJH
run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:49:11Z · abandoned wrun_01M0K4RT28F9RHF5HWAPA7V7DF
run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:49:41Z · abandoned wrun_01M0K4SQ9W2CS4KCT06AT5W1BE

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
❌ ▲ Vercel Production	3327	251	742	4320
✅ 💻 Local Development	3922	0	558	4480
✅ 📦 Local Production	3922	0	558	4480
✅ 🐘 Local Postgres	3922	0	558	4480
❌ 🪟 Windows	319	1	0	320
❌ 🌐 Cross-language Conformance	0	9	132	141
✅ vercel-multi-region	27	0	0	27
Total	15439	261	2548	18248

Details by Category

❌ ▲ Vercel Production

App	Passed	Failed	Skipped
❌ astro-node	124	8	28
❌ astro-quickjs	120	12	28
❌ example-node	122	10	28
❌ example-quickjs	120	12	28
❌ express-node	125	7	28
❌ express-quickjs	121	11	28
❌ fastify-node	125	7	28
❌ fastify-quickjs	120	12	28
❌ hono-node	123	9	28
❌ hono-quickjs	122	10	28
❌ nest-node	120	12	28
❌ nest-quickjs	118	14	28
❌ nextjs-turbopack-node	152	5	3
❌ nextjs-turbopack-quickjs	147	10	3
❌ nextjs-webpack-node	147	10	3
❌ nextjs-webpack-quickjs	149	8	3
❌ nitro-node	124	8	28
❌ nitro-quickjs	123	9	28
❌ nuxt-node	122	10	28
❌ nuxt-quickjs	122	10	28
❌ python-node	0	8	152
❌ sveltekit-node	143	8	9
❌ sveltekit-quickjs	139	12	9
❌ tanstack-start-node	126	6	28
❌ tanstack-start-quickjs	127	5	28
❌ vite-node	125	7	28
❌ vite-quickjs	121	11	28

✅ 💻 Local Development

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 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	159	1	0

❌ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
❌ python	0	9	132

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

📋 View full workflow run

github-actions · 2026-08-14T19:21:27Z

📊 Workflow Benchmarks

commit 236253d · Fri, 21 Aug 2026 22:17:54 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	223 (-77%) 💚	1356 🔴 (+24%) 🔻	1448 🔴 (+31%) 🔻	2522 🔴 (+126%) 🔻	30
TTFS	stream	343 (+47%) 🔻	1362 🔴 (+25%) 🔻	1396 🔴 (+22%) 🔻	1475 🔴 (+15%)	30
TTFS	hook + stream	378 (-60%) 💚	1768 🔴 (+30%) 🔻	1830 🔴 (+31%) 🔻	1862 🔴 (+30%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	631 (+18%) 🔻	1966 (+174%) 🔻	2003 (+28%) 🔻	2193 (+21%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	1817 (+19%) 🔻	3573 (-15%)	3678 (-22%) 💚	4761 (-3.3%)	10
STSO	1020 steps (inline)	137 (+12%)	203 (+6.8%)	233 (+5.4%)	420 (-6.0%)	1019
WO	1020 steps	199958 (+9.2%)	199958 (+9.2%)	199958 (+9.2%)	199958 (+9.2%)	1
CRTT	first chunk (pooled)	105 (+15%) 🔻	166 (+25%) 🔻	189 (+11%)	231 (+10%)	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	142 (+34%)	172 (+25%)	234 (-15%)	635 (+36%)	167 (+13%)	10
size sweep (100/s, 160B-12KB)	145 (+24%)	281 (+104%)	425 (+12%)	4202 (+356%)	285 (+117%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	145 (+1%)	177 (+57%)	255 (+55%)	1016 (+32%)	303 (-2%)	3
replay eve-gpt-5.6-sol-2000t (1x)	186 (+25%)	167 (+31%)	219 (+39%)	549 (+102%)	598 (+107%)	2
replay eve-gpt-5.6-sol-2000t (2x)	170 (+48%)	319 (+98%)	457 (+99%)	933 (+57%)	687 (+159%)	3

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

1020 steps (inline)

Cumulative STSO time: main 182882ms → this run 199778ms (Δ +16896ms, +9%)

  100-150 ms  ┃██████                   main 214  this  10  -204
  150-200 ms  ████████████████████░░░┃  main 611  this 719  +108
  200-250 ms  █████░┃                   main 135  this 217   +82
  250-300 ms  █┃                        main  28  this  45   +17
  300-350 ms  ┃                         main  11  this  10    -1
  350-400 ms  ┃                         main   5  this   7    +2
  400-450 ms  ┃                         main   6  this   3    -3
  450-500 ms  ┃                         main   3  this   1    -2
  500-550 ms  ┃                         main   1  this   1    +0
  550-600 ms  ┃                         main   2  this   2    +0
  600-650 ms  ┃                         main   1  this   1    +0
  650-700 ms  ┃                         main   1  this   0    -1
  700-750 ms  ┃                         main   1  this   0    -1
  800-850 ms  ┃                         main   0  this   1    +1
1000-1050 ms  ┃                         main   0  this   1    +1
1150-1200 ms  ┃                         main   0  this   1    +1

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

variant  RTT 1ms→5s+             avg         p50         p90           p99     n
control  ······▂█▂▁···  147.3 (+25%)  128 (+22%)  234 (-15%)    635 (+36%)  3000
sweep    ······▂█▄▁·▁·    244 (+83%)  148 (+36%)  425 (+12%)  4202 (+356%)  3000
gw 1x    ·····▁▂█▂▁▁··  156.3 (+45%)  137 (+47%)  255 (+55%)   1016 (+32%)  5295
eve 1x   ·····▁▃█▂▁···  141.3 (+37%)  120 (+35%)  219 (+39%)   549 (+102%)  5186
eve 2x   ·····▁▂█▅▁▁··  200.2 (+46%)  155 (+38%)  457 (+99%)    933 (+57%)  7779

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

control  ▇▅▁▃▅█▆▃▁▃  128–169ms
sweep    ▂▁▁▂▂▁▁▂▆█  155–537ms
gw 1x    ▄▂▂▃▁▂▃█▁▂  126–252ms
eve 1x   ▁▇▂▂▁▄▅█▂█  118–171ms
eve 2x   ▁▂▃█▇▃▅▆▄▂  158–255ms

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

sweep  ▂▃▂▂▁█▃  241–252ms

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

control  ▅▁▃▂▄▅▃▄▁█  38–54ms
sweep    ▁▂▂▂▃▁▃▂█▁  62–191ms
gw 1x    ▅▄▃▄▃▄▇█▁▄  38–61ms
eve 1x   ▁▆▃▃▃▅▄▅▂█  25–38ms
eve 2x   ▇▃▄▇█▃▃▁▁▇  24–39ms

📜 Previous results (1)

`5426321`

Fri, 14 Aug 2026 19:45:01 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1367 (+93%) 🔻	1476 🔴 (+46%) 🔻	1505 🔴 (+48%) 🔻	1589 🔴 (+5.3%)	30
TTFS	stream	431 (-55%) 💚	1514 🔴 (+53%) 🔻	1581 🔴 (+57%) 🔻	1613 🔴 (+53%) 🔻	30
TTFS	hook + stream	1606 (+33%) 🔻	1772 🔴 (+37%) 🔻	1791 🔴 (+34%) 🔻	1860 🔴 (+16%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	8974	10306	10548	15232	10
Fan-out TTLS	Promise.all(100 steps)	17586	18894	19169	25008	10
STSO	1020 steps (inline)	122	175	197	336	1019
WO	1020 steps	172599 (-55%) 💚	172599 (-55%) 💚	172599 (-55%) 💚	172599 (-55%) 💚	1
SL	stream latency	111 (+37%) 🔻	153 🔴 (+16%) 🔻	161 🔴 (+15%)	302 🔴 (+69%) 🔻	30
SO	stream overhead (text)	134 (+33%) 🔻	180 (±0%)	203 (±0%)	399 (+60%) 🔻	30
SO	stream overhead (structured)	125 (+26%) 🔻	180 (+11%)	201 (+3.1%)	270 (+24%) 🔻	30

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 · 2026-08-14T19:24:22Z

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 · 2026-08-14T19:29:59Z

Event Log Race Repro

vercel 2/20 regressions — 2 stuck
local clean, 20 runs
postgres clean, 20 runs

Run History

Run	Lane	Total	Complete	Corrupt	Stuck
08-14 19:29	vercel	14	14	0	0
	local	14	14	0	0
	postgres	14	14	0	0
08-20 22:46	vercel	20	16	4	0
	local	20	16	4	0
	postgres	20	18	2	0
08-21 21:53	vercel	20	18	0	2
	local	20	20	0	0
	postgres	20	20	0	0

Latest Non-Completed Runs

Lane	Scenario	Attempt	Outcome	Run
vercel	hook-storm	1	stuck	wrun_41M0K4HGRM0GTVDJT6J0BHPDEQ
vercel	blocked-branch	1	stuck	wrun_41M0K4RWFQ0GXG1KQMSR172KJF

Config

vercel: 20 runs / step-storm 6, hook-storm 6, blocked-branch 6, hook-sleep 2 / c8 / 6x8 / watchdog 2500ms / step 2200±250ms / stagger 400ms / burst 4000+1200ms / poke 750ms / poke budget 64 then /8 / timeout 240000ms

local, postgres: 20 runs / step-storm 6, hook-storm 6, blocked-branch 6, hook-sleep 2 / c8 / 6x8 / watchdog 2500ms / step 2200±250ms / stagger 400ms / burst 4000+1200ms / poke 750ms / poke budget 64 then /8 / timeout 480000ms

#3696 added five blocked-branch dispatch inputs and wired them into the Vercel job only, so a dispatch tuning that scenario reached one lane and left the other two on harness defaults — the silent per-lane divergence the inputs' own comment warns about. Every EVENT_LOG_RACE_REPRO_* knob now reaches both jobs. Also names the fourth scenario in the AGENTS.md intro, which still said three. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Peter Wielander <peter.wielander@vercel.com>

# Conflicts: # AGENTS.md

github-actions · 2026-08-21T22:32:41Z

No backport to stable for 9760f64 (AI decision).

This is tuning of the main-only event-log-race-repro investigation harness: it adds a new POKE_DECAY_FACTOR knob and dispatch input, and raises a run timeout in scripts/event-log-race-repro-local.sh. It builds directly on main-only work — stable has no local lanes in .github/workflows/event-log-race-repro.yml, no scripts/event-log-race-repro-local.sh, and no poke-budget/blocked-branch scenario — so most of the change has nothing to apply to. It is not a fix to functionality or a flaky test on stable.

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

9760f640bb79337591e22b7e4c1de7366c6489e3

* origin/main: Run the test suites CI was silently skipping (#3733) [e2e] Change race repro hook poke to soft-degrade instead of hard-stop at budget (#3561)

VaguelySerious and others added 3 commits August 14, 2026 12:19

Add changeset

5426321

Signed-off-by: Peter Wielander <peter.wielander@vercel.com>

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VaguelySerious and others added 2 commits August 20, 2026 15:32

Merge remote-tracking branch 'origin/main' into peter/repro-poke-decay

4511a7f

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Merge remote-tracking branch 'origin/main' into peter/repro-poke-decay

236253d

# Conflicts: # AGENTS.md

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VaguelySerious marked this pull request as ready for review August 21, 2026 22:30

VaguelySerious requested a review from a team as a code owner August 21, 2026 22:30

VaguelySerious merged commit 9760f64 into main Aug 21, 2026
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VaguelySerious deleted the peter/repro-poke-decay branch August 21, 2026 22:31

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[e2e] Decay the repro's poke pump instead of stopping at the budget - #3561

[e2e] Decay the repro's poke pump instead of stopping at the budget#3561
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`5426321`

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🧪 E2E Test Results

❌ Failed E2E Tests

🪟 Windows (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

5426321

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Sim World

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Event Log Race Repro

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Latest Non-Completed Runs

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