Bugfix: Fix race condition between interleaved and non-interleaved updates #24353
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Demonstrates the bug reported in facebook#24350.
"Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished. There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order. The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.
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sebmarkbage
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Apr 12, 2022
gaearon
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Apr 12, 2022
rickhanlonii
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Apr 13, 2022
…dates (#24353) * Regression test: Interleaved update race condition Demonstrates the bug reported in #24350. * Bugfix: Last update wins, even if interleaved "Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished. There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order. The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.
rickhanlonii
pushed a commit
that referenced
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Apr 14, 2022
…dates (#24353) * Regression test: Interleaved update race condition Demonstrates the bug reported in #24350. * Bugfix: Last update wins, even if interleaved "Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished. There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order. The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.
zhengjitf
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Apr 15, 2022
…dates (facebook#24353) * Regression test: Interleaved update race condition Demonstrates the bug reported in facebook#24350. * Bugfix: Last update wins, even if interleaved "Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished. There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order. The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.
rickhanlonii
pushed a commit
that referenced
this pull request
Apr 19, 2022
…dates (#24353) * Regression test: Interleaved update race condition Demonstrates the bug reported in #24350. * Bugfix: Last update wins, even if interleaved "Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished. There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order. The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.
facebook-github-bot
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to facebook/react-native
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Apr 26, 2022
Summary: This sync includes the following changes: - **[bd4784c8f](facebook/react@bd4784c8f )**: Revert #24236 (Don't recreate the same fallback on the client if hydrating suspends) ([#24434](facebook/react#24434)) //<dan>// - **[6d3b6d0f4](facebook/react@6d3b6d0f4 )**: forwardRef et al shouldn't affect if props reused ([#24421](facebook/react#24421)) //<Andrew Clark>// - **[bd0813766](facebook/react@bd0813766 )**: Fix: useDeferredValue should reuse previous value ([#24413](facebook/react#24413)) //<Andrew Clark>// - **[9ae80d6a2](facebook/react@9ae80d6a2 )**: Suppress hydration warnings when a preceding sibling suspends ([#24404](facebook/react#24404)) //<Josh Story>// - **[0dc4e6663](facebook/react@0dc4e6663 )**: Land enableClientRenderFallbackOnHydrationMismatch ([#24410](facebook/react#24410)) //<Andrew Clark>// - **[354772952](facebook/react@354772952 )**: Land enableSelectiveHydration flag ([#24406](facebook/react#24406)) //<Andrew Clark>// - **[392808a1f](facebook/react@392808a1f )**: Land enableClientRenderFallbackOnTextMismatch flag ([#24405](facebook/react#24405)) //<Andrew Clark>// - **[1e748b452](facebook/react@1e748b452 )**: Land enableLazyElements flag ([#24407](facebook/react#24407)) //<Andrew Clark>// - **[4175f0593](facebook/react@4175f0593 )**: Temporarily feature flag numeric fallback for symbols ([#24401](facebook/react#24401)) //<Ricky>// - **[a6d53f346](facebook/react@a6d53f346 )**: Revert "Clean up Selective Hydration / Event Replay flag ([#24156](facebook/react#24156))" ([#24402](facebook/react#24402)) //<Ricky>// - **[ab9cdd34f](facebook/react@ab9cdd34f )**: Bugfix: In legacy mode, call suspended tree's unmount effects when it is deleted ([#24400](facebook/react#24400)) //<Andrew Clark>// - **[168da8d55](facebook/react@168da8d55 )**: Fix typo that happened during rebasing //<Andrew Clark>// - **[8bc527a4c](facebook/react@8bc527a4c )**: Bugfix: Fix race condition between interleaved and non-interleaved updates ([#24353](facebook/react#24353)) //<Andrew Clark>// - **[f7cf077cc](facebook/react@f7cf077cc )**: [Transition Tracing] Add Offscreen Queue ([#24341](facebook/react#24341)) //<Luna Ruan>// - **[4fc394bbe](facebook/react@4fc394bbe )**: Fix suspense fallback throttling ([#24253](facebook/react#24253)) //<sunderls>// - **[80170a068](facebook/react@80170a068 )**: Match bundle.name and match upper case entry points ([#24346](facebook/react#24346)) //<Sebastian Markbåge>// - **[fea6f8da6](facebook/react@fea6f8da6 )**: [Transition Tracing] Add transition to OffscreenState and pendingSuspenseBoundaries to RootState ([#24340](facebook/react#24340)) //<Luna Ruan>// - **[8e2f9b086](facebook/react@8e2f9b086 )**: move passive flag ([#24339](facebook/react#24339)) //<Luna Ruan>// - **[55a21ef7e](facebook/react@55a21ef7e )**: fix pushTransition for transition tracing ([#24338](facebook/react#24338)) //<Luna Ruan>// - **[069d23bb7](facebook/react@069d23bb7 )**: [eslint-plugin-exhaustive-deps] Fix exhaustive deps check for unstable vars ([#24343](facebook/react#24343)) //<Afzal Sayed>// - **[4997515b9](facebook/react@4997515b9 )**: Point useSubscription to useSyncExternalStore shim ([#24289](facebook/react#24289)) //<dan>// - **[01e2bff1d](facebook/react@01e2bff1d )**: Remove unnecessary check ([#24332](facebook/react#24332)) //<zhoulixiang>// - **[d9a0f9e20](facebook/react@d9a0f9e20 )**: Delete create-subscription folder ([#24288](facebook/react#24288)) //<dan>// - **[f993ffc51](facebook/react@f993ffc51 )**: Fix infinite update loop that happens when an unmemoized value is passed to useDeferredValue ([#24247](facebook/react#24247)) //<Andrew Clark>// - **[fa5800226](facebook/react@fa5800226 )**: [Fizz] Pipeable Stream Perf ([#24291](facebook/react#24291)) //<Josh Story>// - **[0568c0f8c](facebook/react@0568c0f8c )**: Replace zero with NoLanes for consistency in FiberLane ([#24327](facebook/react#24327)) //<Leo>// - **[e0160d50c](facebook/react@e0160d50c )**: add transition tracing transitions stack ([#24321](facebook/react#24321)) //<Luna Ruan>// - **[b0f13e5d3](facebook/react@b0f13e5d3 )**: add pendingPassiveTransitions ([#24320](facebook/react#24320)) //<Luna Ruan>// Changelog: [General][Changed] - React Native sync for revisions 60e63b9...bd4784c jest_e2e[run_all_tests] Reviewed By: kacieb Differential Revision: D35899012 fbshipit-source-id: 86a885e336fca9f0efa80cd2b8ca040f2cb53853
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"Interleaved" updates are updates that are scheduled while a render is already in progress. We put these on a special queue so that they don't get processed during the current render. Then we transfer them to the "real" queue after the render has finished.
There was a race condition where an update is received after the render has finished but before the interleaved update queue had been transferred, causing the updates to be queued in the wrong order.
The fix I chose is to check if the interleaved updates queue is empty before adding any update to the real queue. If it's not empty, then the new update must also be treated as interleaved.