Pull Request Overview

Opened on October 14, 2026
Status Merged
Commit count 1 with first commit October 14, 2026

Total Delta

82 Total Diff Delta

Open Days

Open 23 weekdays

Test Delta

0 Diff Delta in Test Files

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	0.0 days	Authoring 1 commit before pull request opened for review
	0.0 days	Awaiting first review
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Fix overlapping replay slots after a prerender abort

Summary

A prerender can abort during a retry after the retried task has spawned a suspended child. Abort cleanup records a replay slot for the whole task, then tries to record a child slot at the same key path. Resuming the parent already renders that child, so the existing assertion turns a resumable abort into a prerender error. This surfaced after the abort unwind change in #37710.

Keep the parent slot and ignore the redundant child slot. The regression test verifies that both children render after resuming.

How did you test this change?

yarn test ReactDOMFizzStaticBrowser --runInBand (36 passed)

yarn test ReactDOMFizzStaticBrowser --prod --runInBand (36 passed)

yarn linc

node scripts/prettier/index.js check-changed

Comments Threads Pending Resolution

packages/react-server/src/ReactFizzServer.js

          slots = resumableNode[3] = {} as {[index: number]: number};

        } else if (typeof slots === 'number') {

          // The parent task was aborted after it spawned this child task.

          // Resuming the parent also renders this child, so its slot is redundant.

          return;

Resolved Comment Threads

No resolved comments have been left on this PR.

	4197		`slots = resumableNode[3] = {} as {[index: number]: number};`
	4198		`} else if (typeof slots === 'number') {`
	4199		`// The parent task was aborted after it spawned this child task.`
	4200		`// Resuming the parent also renders this child, so its slot is redundant.`
	4201		`return;`

Fix overlapping replay slots after a prerender abort #37850