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Fix unwinding starting with a wrong Fiber on error in the complete phase #13237

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merged 4 commits into from
Jul 19, 2018
Merged

Fix unwinding starting with a wrong Fiber on error in the complete phase #13237

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4b42af1
Add a repro case for profiler unwinding
gaearon Jul 18, 2018
7ca7cc9
Add a regression test for context stack
gaearon Jul 19, 2018
6815275
Simplify the first test case
gaearon Jul 19, 2018
9422702
Update nextUnitOfWork inside completeUnitOfWork()
gaearon Jul 19, 2018
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3 changes: 2 additions & 1 deletion packages/react-reconciler/src/ReactFiberScheduler.js
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Original file line number Diff line number Diff line change
Expand Up @@ -791,11 +791,12 @@ function completeUnitOfWork(workInProgress: Fiber): Fiber | null {

if ((workInProgress.effectTag & Incomplete) === NoEffect) {
// This fiber completed.
let next = completeWork(
nextUnitOfWork = completeWork(
current,
workInProgress,
nextRenderExpirationTime,
);
let next = nextUnitOfWork;
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next is always null ever since we deleted call/return. Let's just remove the block below.

stopWorkTimer(workInProgress);
resetExpirationTime(workInProgress, nextRenderExpirationTime);
if (__DEV__) {
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21 changes: 21 additions & 0 deletions packages/react-reconciler/src/__tests__/ReactNewContext-test.internal.js
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Expand Up @@ -1128,6 +1128,27 @@ describe('ReactNewContext', () => {
]);
});

it('unwinds after errors in complete phase', () => {
const Context = React.createContext(0);

// This is a regression test for stack misalignment
// caused by unwinding the context from wrong point.
ReactNoop.render(
<errorInCompletePhase>
<Context.Provider />
</errorInCompletePhase>,
);
expect(ReactNoop.flush).toThrow('Error in host config.');

ReactNoop.render(
<Context.Provider value={10}>
<Context.Consumer>{value => <span prop={value} />}</Context.Consumer>
</Context.Provider>,
);
ReactNoop.flush();
expect(ReactNoop.getChildren()).toEqual([span(10)]);
});

describe('fuzz test', () => {
const Fragment = React.Fragment;
const contextKeys = ['A', 'B', 'C', 'D', 'E', 'F', 'G'];
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11 changes: 11 additions & 0 deletions packages/react/src/__tests__/ReactProfiler-test.internal.js
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Expand Up @@ -999,6 +999,17 @@ describe('Profiler', () => {
);
expect(ReactNoop.flush).toThrow('Error in host config.');

// A similar case we've seen caused by an invariant in ReactDOM.
// It didn't reproduce without a host component inside.
ReactNoop.render(
<React.unstable_Profiler id="profiler" onRender={jest.fn()}>
<errorInCompletePhase>
<span>hi</span>
</errorInCompletePhase>
</React.unstable_Profiler>,
);
expect(ReactNoop.flush).toThrow('Error in host config.');

// So long as the profiler timer's fiber stack is reset correctly,
// Subsequent renders should not error.
ReactNoop.render(
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