Labels service leaks listeners in emmet integration tests #119968

connor4312 · 2021-03-26T16:10:47Z

While checking #116775, I noticed another leak which looks like it's coming from here:

vscode/src/vs/workbench/browser/labels.ts

Line 135 in 7208128

    
           this._register(this.modeService.onLanguagesMaybeChanged(() => this.widgets.forEach(widget => widget.notifyExtensionsRegistered())));

2021-03-26T13:25:15.0689588Z [3732:0326/132514.638:INFO:CONSOLE(366)] "[cbe] potential listener LEAK detected, having 175 listeners already. MOST frequent listener (1):", source: file:///D:/a/vscode/vscode/out/vs/base/common/event.js (366)
2021-03-26T13:25:15.3416079Z [3732:0326/132514.638:INFO:CONSOLE(367)] "    at ResourceLabel.registerListeners (file:///D:/a/vscode/vscode/out/vs/workbench/browser/labels.js:53:45)
2021-03-26T13:25:15.8222962Z     at new ResourceLabels (file:///D:/a/vscode/vscode/out/vs/workbench/browser/labels.js:45:18)
2021-03-26T13:25:15.8229698Z     at new ResourceLabel (file:///D:/a/vscode/vscode/out/vs/workbench/browser/labels.js:151:13)
2021-03-26T13:25:15.8234242Z     at InstantiationService._createInstance (file:///D:/a/vscode/vscode/out/vs/platform/instantiation/common/instantiationService.js:89:20)
2021-03-26T13:25:15.8240358Z     at InstantiationService.createInstance (file:///D:/a/vscode/vscode/out/vs/platform/instantiation/common/instantiationService.js:60:31)
2021-03-26T13:25:15.8250874Z     at FileItem.render (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:87:52)
2021-03-26T13:25:15.8265336Z     at BreadcrumbsWidget._renderItem (file:///D:/a/vscode/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:257:22)
2021-03-26T13:25:16.2327058Z     at BreadcrumbsWidget._render (file:///D:/a/vscode/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:231:22)
2021-03-26T13:25:17.9332466Z     at BreadcrumbsWidget.setItems (file:///D:/a/vscode/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:216:22)
2021-03-26T13:25:17.9849237Z     at updateBreadcrumbs (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:186:30)
2021-03-26T13:25:17.9864177Z     at BreadcrumbsControl.update (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:191:13)
2021-03-26T13:25:17.9884195Z     at TabsTitleControl.openEditor (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/tabsTitleControl.js:265:84)
2021-03-26T13:25:17.9893464Z     at EditorGroupView.doShowEditor (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:754:35)
2021-03-26T13:25:17.9930833Z     at EditorGroupView.doOpenEditor (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:720:43)
2021-03-26T13:25:17.9939471Z   170 passing (45s)
2021-03-26T13:25:17.9940923Z     at EditorGroupView.openEditor (file:///D:/a/vscode/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:654:64)
2021-03-26T13:25:17.9946230Z     at EditorService.openEditor (file:///D:/a/vscode/vscode/out/vs/workbench/services/editor/browser/editorService.js:453:77)
2021-03-26T13:25:17.9955967Z     at MainThreadTextEditors.$tryShowTextDocument (file:///D:/a/vscode/vscode/out/vs/workbench/api/browser/mainThreadEditors.js:113:54)
2021-03-26T13:25:17.9991898Z     at RPCProtocol._doInvokeHandler (file:///D:/a/vscode/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:348:27)
2021-03-26T13:25:17.9996721Z     at RPCProtocol._invokeHandler (file:///D:/a/vscode/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:333:45)
2021-03-26T13:25:18.0008219Z     at RPCProtocol._receiveRequest (file:///D:/a/vscode/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:260:32)
2021-03-26T13:25:18.0010768Z     at RPCProtocol._receiveOneMessage (file:///D:/a/vscode/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:188:26)
2021-03-26T13:25:18.0012831Z     at file:///D:/a/vscode/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:69:52
2021-03-26T13:25:18.0014606Z     at Emitter.fire (file:///D:/a/vscode/vscode/out/vs/base/common/event.js:479:38)
2021-03-26T13:25:18.0016996Z     at BufferedEmitter.fire (file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/common/ipc.net.js:375:35)
2021-03-26T13:25:18.0029429Z     at PersistentProtocol._receiveMessage (file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/common/ipc.net.js:654:41)
2021-03-26T13:25:18.0097268Z     at file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/common/ipc.net.js:510:83
2021-03-26T13:25:18.0128736Z     at Emitter.fire (file:///D:/a/vscode/vscode/out/vs/base/common/event.js:479:38)
2021-03-26T13:25:18.0132810Z     at ProtocolReader.acceptChunk (file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/common/ipc.net.js:189:37)
2021-03-26T13:25:18.0134626Z     at file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/common/ipc.net.js:158:61
2021-03-26T13:25:18.0136245Z     at Socket.listener (file:///D:/a/vscode/vscode/out/vs/base/parts/ipc/node/ipc.net.js:33:40)
2021-03-26T13:25:18.0139336Z     at Socket.emit (events.js:315:20)
2021-03-26T13:25:18.0140660Z     at addChunk (_stream_readable.js:295:12)
2021-03-26T13:25:18.0141774Z     at readableAddChunk (_stream_readable.js:271:9)
2021-03-26T13:25:18.0144521Z     at Socket.Readable.push (_stream_readable.js:212:10)
2021-03-26T13:25:18.0146566Z     at Pipe.onStreamRead (internal/stream_base_commons.js:186:23)", source: file:///D:/a/vscode/vscode/out/vs/base/common/event.js (367)
2021-03-26T13:25:18.5344169Z yarn run v1.22.10
2021-03-26T13:25:18.6223094Z $ node build/lib/electron
2021-03-26T13:25:19.0531321Z Done in 0.55s.
2021-03-26T13:25:20.1339950Z 
2021-03-26T13:25:20.2864269Z Found --crash-reporter-directory argument. Setting crashDumps directory to be 'D:\a\vscode\vscode\.build\crashes'
2021-03-26T13:25:21.3047035Z (node:6376) electron: The default of contextIsolation is deprecated and will be changing from false to true in a future release of Electron.  See https://github.com/electron/electron/issues/23506 for more information
2021-03-26T13:25:24.9227274Z (node:6376) electron: The default of contextIsolation is deprecated and will be changing from false to true in a future release of Electron.  See https://github.com/electron/electron/issues/23506 for more information
2021-03-26T13:25:25.7940954Z [6376:0326/132524.961:INFO:CONSOLE(632)

The text was updated successfully, but these errors were encountered:

bpasero · 2021-03-29T06:32:48Z

I can reproduce and this seems to originate from BreadcrumbsWidget @jrieken. Though I am not sure this is actually a leak or just the fact that the emmet integration tests open so many editors during the run.

I noticed that the emmet tests did not properly close editors on teardown and pushed b19f50e as a fix.

Anyhow, should revisit the dispose is properly called for breadcrumb helpers such as FileItem.

jrieken · 2021-03-29T06:53:18Z

MOST frequent listener (1):",

The (1) means that there most frequent stacktrace occurs once. So, I doubt that this is a leak

bpasero · 2021-03-29T09:01:33Z

I also played around with some ref counting of FileItem and did not see a leak opening and closing editors.

@jrieken should we maybe not print any exception if the most recent stack is (1) indicating that there is probably no leak?

jrieken · 2021-03-29T14:01:20Z

not print any exception if the most recent stack is (1) indicating that there is probably no leak?

idk - I think there is still value. Even tho, there are many, many individual listener we should take it as sign of a problem. In this case we should ask ourself if we really want hundreds or thousands of editors open at the same time

bpasero · 2021-03-29T14:36:01Z

@jrieken they are opened but also closed, at least visually I see just always 1 editor open. There are hundreds of editors opened and closed in a very short timeframe, which probably causes breadcrumbs to update a ton. At least for tabs they always share the same resource label, so that might explain why there is no warning for tabs.

Agree it would be interesting if some cleanup is missing in the test run at least.

bpasero · 2021-03-29T16:47:42Z

This is very very bizarre. Commenting out just this line makes the exception go away:

vscode/src/vs/workbench/browser/labels.ts

Line 135 in a54d8b2

    
           this._register(this.modeService.onLanguagesMaybeChanged(() => this.widgets.forEach(widget => widget.notifyExtensionsRegistered())));

In other words, I verified that the FileLabel gets disposed properly, otherwise all the other listeners in ResourceLabels would show an error too.

@jrieken I am clueless why this one listener would result in the error, it looks like a very normal Event like the others, such as this one which is also not causing any error to be printed? Do you have an idea?

vscode/src/vs/workbench/browser/labels.ts

Line 138 in a54d8b2

this._register(this.modelService.onModelModeChanged(e => {

bpasero · 2021-03-29T16:50:54Z

Hm, maybe this is a red herring and this is just the last listener that is causing the error to print but otherwise being unrelated...

bpasero · 2021-03-29T17:06:35Z

Wow, an actual leak. I didn't know that ILanguageSelection is disposable!

vscode/src/vs/editor/common/services/modeServiceImpl.ts

Line 29 in e114a24

this._register(onLanguagesMaybeChanged(() => this._evaluate()));

bpasero · 2021-03-30T05:35:25Z

@alexdima I think the concept of LanguageSelection came in via 44a8080#diff-6b0324a9b2e122283182cacbd5f53b0add5387c5b9a8f51b48c4cf1daa84bac9 a while ago and you have to help me understand how to use it.

It seems to me that we now often have code like this:

vscode/src/vs/workbench/services/preferences/browser/preferencesService.ts

Lines 122 to 123 in 5f17dc2

    
           const languageSelection = this.modeService.create('jsonc'); 
        
           const model = this._register(this.modelService.createModel('', languageSelection, uri));

Another example in notebook land:

vscode/src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts

Lines 550 to 555 in 06a451d

    
           const language = cell.cellKind === CellKind.Markdown ? this._modeService.create('markdown') : (cell.language ? this._modeService.create(cell.language) : this._modeService.createByFilepathOrFirstLine(resource, cell.textBuffer.getLineContent(1))); 
        
           result = this._modelService.createModel( 
        
           	bufferFactory, 
        
           	language, 
        
           	resource 
        
           );

Where we first create the languageSelection and then pass it into the model (via createModel).

Should the calls that create the ILanguageSelection do the disposing of it? I think that needs a wider adoption then for anyone calling any of these methods:

IModeService#create
IModeService#createByLanguageName
IModeService#createByFilepathOrFirstLine

alexdima · 2021-04-01T16:05:33Z

@bpasero I have pushed a fix for the ILanguageSelection via 4cd94d0

Even with this fix, when I execute the emmet tests I still see the leakage warning initially reported. So I don't believe that was the root cause here. I am leaving the issue open for you to decide what to do:

[93e] potential listener LEAK detected, having 175 listeners already. MOST frequent listener (1):
    at ResourceLabel.registerListeners (file:///Users/alex/src/vscode/out/vs/workbench/browser/labels.js:53:45)
    at new ResourceLabels (file:///Users/alex/src/vscode/out/vs/workbench/browser/labels.js:45:18)
    at new ResourceLabel (file:///Users/alex/src/vscode/out/vs/workbench/browser/labels.js:151:13)
    at InstantiationService._createInstance (file:///Users/alex/src/vscode/out/vs/platform/instantiation/common/instantiationService.js:89:20)
    at InstantiationService.createInstance (file:///Users/alex/src/vscode/out/vs/platform/instantiation/common/instantiationService.js:60:31)
    at FileItem.render (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:87:52)
    at BreadcrumbsWidget._renderItem (file:///Users/alex/src/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:262:22)
    at BreadcrumbsWidget._render (file:///Users/alex/src/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:236:22)
    at BreadcrumbsWidget.setItems (file:///Users/alex/src/vscode/out/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.js:221:22)
    at updateBreadcrumbs (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:199:34)
    at BreadcrumbsControl.update (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/breadcrumbsControl.js:205:13)
    at TabsTitleControl.openEditor (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/tabsTitleControl.js:265:84)
    at EditorGroupView.doShowEditor (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:747:35)
    at EditorGroupView.doOpenEditor (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:713:43)
    at EditorGroupView.openEditor (file:///Users/alex/src/vscode/out/vs/workbench/browser/parts/editor/editorGroupView.js:647:25)
    at EditorService.openEditor (file:///Users/alex/src/vscode/out/vs/workbench/services/editor/browser/editorService.js:453:38)
    at MainThreadTextEditors.$tryShowTextDocument (file:///Users/alex/src/vscode/out/vs/workbench/api/browser/mainThreadEditors.js:113:54)
    at RPCProtocol._doInvokeHandler (file:///Users/alex/src/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:348:27)
    at RPCProtocol._invokeHandler (file:///Users/alex/src/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:333:45)
    at RPCProtocol._receiveRequest (file:///Users/alex/src/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:260:32)
    at RPCProtocol._receiveOneMessage (file:///Users/alex/src/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:188:26)
    at file:///Users/alex/src/vscode/out/vs/workbench/services/extensions/common/rpcProtocol.js:69:52
    at Emitter.fire (file:///Users/alex/src/vscode/out/vs/base/common/event.js:479:38)
    at BufferedEmitter.fire (file:///Users/alex/src/vscode/out/vs/base/parts/ipc/common/ipc.net.js:375:35)
    at PersistentProtocol._receiveMessage (file:///Users/alex/src/vscode/out/vs/base/parts/ipc/common/ipc.net.js:654:41)
    at file:///Users/alex/src/vscode/out/vs/base/parts/ipc/common/ipc.net.js:510:83
    at Emitter.fire (file:///Users/alex/src/vscode/out/vs/base/common/event.js:479:38)
    at ProtocolReader.acceptChunk (file:///Users/alex/src/vscode/out/vs/base/parts/ipc/common/ipc.net.js:189:37)
    at file:///Users/alex/src/vscode/out/vs/base/parts/ipc/common/ipc.net.js:158:61
    at Socket.listener (file:///Users/alex/src/vscode/out/vs/base/parts/ipc/node/ipc.net.js:33:40)
    at Socket.emit (events.js:315:20)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:271:9)
    at Socket.Readable.push (_stream_readable.js:212:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:186:23)

bpasero · 2021-04-05T11:19:06Z

@alexdima I think there is still a leak, trying to find it I added a trace to the first listener that gets added to LanguageSelection and it seems to be this ModelData.setLanguage call:

at Object.onFirstListenerAdd (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/editor/common/services/modeServiceImpl.js:16:52)
    at LanguageSelection._event [as onDidChange] (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/base/common/event.js:417:39)
    at ModelData.setLanguage (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/editor/common/services/modelServiceImpl.js:53:71)
    at ModelServiceImpl.setMode (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/editor/common/services/modelServiceImpl.js:378:23)
    at ModelServiceImpl.createModel (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/editor/common/services/modelServiceImpl.js:362:22)
    at TextFileEditorModel.doCreateTextEditorModel (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/common/editor/textEditorModel.js:79:43)
    at TextFileEditorModel.createTextEditorModel (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/common/editor/textEditorModel.js:74:25)
    at TextFileEditorModel.doCreateTextModel (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/services/textfile/common/textFileEditorModel.js:387:36)
    at TextFileEditorModel.resolveFromContent (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/services/textfile/common/textFileEditorModel.js:373:22)
    at TextFileEditorModel.resolveFromFile (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/services/textfile/common/textFileEditorModel.js:315:29)
    at async TextFileEditorModelManager.resolve (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/services/textfile/common/textFileEditorModelManager.js:261:17)
    at async TextModelResolverService.createModelReference (vscode-file://vscode-app/Users/bpasero/Development/Microsoft/monaco/out/vs/workbench/services/textmodelResolver/common/textModelResolverService.js:160:31)

So it seems that ModelData needs to be disposed properly. Looking at creators of ModelData, it is not clear to me how I can dispose it:

vscode/src/vs/editor/browser/widget/codeEditorWidget.ts

Line 1580 in 3516df7

this._modelData = new ModelData(model, viewModel, view, hasRealView, listenersToRemove);
vscode/src/vs/editor/common/services/modelServiceImpl.ts

Line 400 in 4cd94d0

const modelData = new ModelData(
vscode/src/vs/workbench/contrib/notebook/browser/notebookServiceImpl.ts

Line 543 in 7c8da70

this._models.set(uri, new ModelData(notebookModel, this._onWillDisposeDocument.bind(this)));

Can you advise?

alexdima · 2021-04-06T08:06:07Z

@bpasero What steps should I take to observe a leak? ModelData is disposed here.

bpasero · 2021-04-06T09:45:33Z

@alexdima nevermind, I figured out the root cause: we use this method to open a random file for integration tests:

vscode/extensions/emmet/src/test/testUtils.ts

Line 53 in 9b091c7

    
           export function withRandomFileEditor(initialContents: string, fileExtension: string = 'txt', run: (editor: vscode.TextEditor, doc: vscode.TextDocument) => Thenable<void>): Thenable<boolean> {

Which I think is fair, given the API tests only have access to our API. However, this ends up calling openTextDocument which will result in a model reference getting created for text file models. A second reference is created from the text editor itself upon resolving. When the editor closes, we dispose that reference but we do not dispose the one from openTextDocument at the end of the test and as such we "leak" these models at least for a moment.

I think @jrieken has reasons for this, I recall there is a timeout when we GC text file model references with the rationale that we are not giving extensions anyway to dispose those models explicitly.

I pushed a change to increase the threshold for leaking in this one listener but it feels a bit like a workaround / bandaid:

vscode/src/vs/editor/common/services/modeServiceImpl.ts

Line 60 in e848d70

    
           protected readonly _onLanguagesMaybeChanged = this._register(new Emitter<void>({ leakWarningThreshold: 200 /* https://github.com/microsoft/vscode/issues/119968 */ }));

Up to you and maybe Jo to decide if a different fix is needed, but I think this is just how our API works today and the integration tests manage to hit this warning because they open >175 editors in a very short period of time.

jrieken · 2021-04-06T09:54:13Z

I recall there is a timeout when we GC text file model references with the rationale that we are not giving extensions anyway to dispose those models explicitly.

Yes - there is a timeout and total size limit

connor4312 assigned bpasero Mar 26, 2021

bpasero assigned jrieken Mar 29, 2021

bpasero added the breadcrumbs label Mar 29, 2021

bpasero changed the title ~~Labels service leaks listeners in test~~ Labels service leaks listeners in emmet integration tests Mar 29, 2021

bpasero added this to the April 2021 milestone Mar 29, 2021

jrieken added breadcrumbs and removed breadcrumbs labels Mar 29, 2021

bpasero unassigned jrieken Mar 29, 2021

bpasero added freeze-slow-crash-leak VS Code crashing, performance, freeze and memory leak issues workbench-editors Managing of editor widgets in workbench window and removed breadcrumbs labels Mar 29, 2021

bpasero assigned alexdima Mar 30, 2021

bpasero changed the title ~~Labels service leaks listeners in emmet integration tests~~ Creators of ILanguageSelection are not dipsosing it Mar 31, 2021

alexdima added a commit that referenced this issue Apr 1, 2021

ILanguageSelection should not be IDisposable (#119968)

4cd94d0

alexdima changed the title ~~Creators of ILanguageSelection are not dipsosing it~~ Labels service leaks listeners in emmet integration tests Apr 1, 2021

alexdima removed their assignment Apr 1, 2021

bpasero added a commit that referenced this issue Apr 6, 2021

tests - increase leak warning threshold for #119968

e848d70

bpasero closed this as completed Apr 6, 2021

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Labels service leaks listeners in emmet integration tests #119968

Labels service leaks listeners in emmet integration tests #119968

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jrieken commented Apr 6, 2021

Labels service leaks listeners in emmet integration tests #119968

Labels service leaks listeners in emmet integration tests #119968

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