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Revert: [wimp] Turn multithreading on for wimp. - #191423

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flutteractionsbot:revert-190626-1787240857
Aug 20, 2026
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auto-submit[bot] merged 1 commit into
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flutteractionsbot:revert-190626-1787240857

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Reverts: [wimp] Turn multithreading on for wimp.

Initiated by: @bkonyi

Reason for reverting: failing Linux linux_web_engine_tests on tree.

Original PR Author: @eyebrowsoffire

Reviewed By: @mdebbar

The original PR description is provided below:

After #190048, we no longer have multthreading issues with wimp, so we should turn multithreading on.

This addresses #178749

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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

@github-actions github-actions Bot added engine flutter/engine related. See also e: labels. platform-web Web applications specifically team-web Owned by Web platform team labels Aug 20, 2026

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Code Review

This pull request updates skwasm_loader.js to force single-threaded mode for Skwasm when config.enableWimp is enabled, addressing stability issues with multi-threaded Wimp. There are no review comments, and I have no additional feedback to provide.

@mdebbar mdebbar added autosubmit Merge PR when tree becomes green via auto submit App emergency Jump the queue; land PR in front of all others; only use for emergencies labels Aug 20, 2026
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Detected the emergency label.

If you add the autosubmit label, the bot will wait until all presubmits pass but ignore the tree status, allowing fixes for tree breakages while still validating that they don't break any existing presubmits.

The "Merge" button is also unlocked. To bypass presubmits as well as the tree status, press the GitHub "Add to Merge Queue".

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