VSCode spawns too many dsc processes randomly (usually on new instance startup) - causes High CPU/Memory and sometimes system crash

Port from https://github.com/microsoft/vscode/issues/120649

Issue Type: Performance Issue

VSCode spawns too many dsc processes randomly (usually on new instance startup)
My Macbook Pro goes to 100% fan speed and +95 degrees CPU until it crashes or runs out of system memory (not always)

If I manage to close VSCode quickly it goes away after a while

I don't know what this dsc process is [parent process: Code Helper (Renderer)]
There are a lot of Python processes as well.

I suspect it is some extension, tried with disabling all extensions and reloading the window, and seems to help on startup... after reenabling the extensions the fans quickly go to 100% again but don't know how to test which extension it is

Suspect on Java Extension Pack and Language Support for Java(TM) by Red Hat which are the latest ones I installed

I usually have 3-4 instances of VSCode open, the issue happens usually by the end of the workday after the instances were open a while and I open/close new ones.

VS Code version: Code 1.55.0 (c185983a683d14c396952dd432459097bc7f757f, 2021-03-30T16:01:05.981Z)
OS version: Darwin x64 20.3.0

CPU %	Mem MB	   PID	Process
   27	   131	 78309	code main
    6	    82	 78312	   gpu-process
    0	    33	 78314	   utility
   22	   164	 78841	   shared-process
    0	    33	 78843	     ptyHost
    0	    16	 78951	       /bin/zsh -l
    0	     0	 80614	     /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
   18	   279	 80364	   window (index.ts — propeller-api-services)
    1	   377	 80368	     extensionHost
    0	   115	 80379	       electron_node tsserver.js 
    0	   213	 80380	       electron_node tsserver.js 
    0	    82	 80425	         electron_node typingsInstaller.js typesMap.js 
    0	    66	 80385	       electron_node server.js 
    0	   213	 80413	       electron_node server.js 
    0	    82	 80419	       electron_node server.js 
    0	    49	 80440	       electron_node server.js 
    0	   246	 80534	       electron_node eslintServer.js 
    0	    33	 80538	       electron_node ssmServer.js 
    0	    33	 80591	       electron_node aslServer.js 
    0	    49	 80593	       /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper (Renderer).app/Contents/MacOS/Code Helper (Renderer) /Applications/Visual Studio Code.app/Contents/Resources/app/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=80368
    0	    33	 80598	       electron_node server.js 
    0	    33	 80369	     watcherService
    0	    33	 80370	     searchService
   28	    49	 80612	   window (Issue Reporter)

|  Window (index.ts — propeller-api-services)
|    Folder (propeller-api-services): 16 files
|      File types: json(4) yaml(2) ts(2) env(1) gitignore(1) nvmrc(1)
|                  prettierrc(1) md(1)
|      Conf files: package.json(1) tsconfig.json(1);

vsliv368cf:30146710
vsreu685:30147344
python383:30185418
pythonvspyt678:30270856
vspor879:30202332
vspor708:30202333
vspor363:30204092
vstry914:30276682
pythonvsdeb440:30248342
pythonvsded773:30248341
pythonvspyt875:30259475
pythonvspyt639:30281910
pythontb:30283811
openwsldoc:30282072
vspre833:30267464
pythonptprofiler:30281270
vshan820:30276952
pythondataviewer:30285071

Environment

• Operating System: macOS BigSur 11.2.3 (20D91)
• JDK version: openjdk 11.0.10 2021-01-19
• Visual Studio Code version: 1.55.0
• Java extension version: 0.76.0

Please attach logs

Not a lot of error messages

[Extension Host] Error: Background process terminated with code 1.	at ChildProcess.<anonymous> (/Users/bojanche/.vscode/extensions/vscjava.vscode-maven-0.28.0/dist/extension.js:16:27203)	at ChildProcess.emit (events.js:315:20)	at ChildProcess.EventEmitter.emit (domain.js:483:12)	at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
v @ console.ts:137
$logExtensionHostMessage @ mainThreadConsole.ts:35
_doInvokeHandler @ rpcProtocol.ts:417
_invokeHandler @ rpcProtocol.ts:402
_receiveRequest @ rpcProtocol.ts:318
_receiveOneMessage @ rpcProtocol.ts:245
(anonymous) @ rpcProtocol.ts:110
fire @ event.ts:622
fire @ ipc.net.ts:468
_receiveMessage @ ipc.net.ts:821
(anonymous) @ ipc.net.ts:660
fire @ event.ts:622
acceptChunk @ ipc.net.ts:241
(anonymous) @ ipc.net.ts:202
k @ ipc.net.ts:50
emit @ events.js:315
addChunk @ _stream_readable.js:295
readableAddChunk @ _stream_readable.js:271
Readable.push @ _stream_readable.js:212
onStreamRead @ internal/stream_base_commons.js:186

Few warnings

Overwriting grammar scope name to file mapping for scope source.java.
Old grammar file: file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/extensions/java/syntaxes/java.tmLanguage.json.
New grammar file: file:///Users/bojanche/.vscode/extensions/redhat.java-0.76.0/syntaxes/java.tmLanguage.json
register @ TMScopeRegistry.ts:45
R @ TMGrammarFactory.ts:73
_getOrCreateGrammarFactory @ abstractTextMateService.ts:246
async function (async)
_getOrCreateGrammarFactory @ abstractTextMateService.ts:235
(anonymous) @ abstractTextMateService.ts:271
_registerDefinitionIfAvailable @ abstractTextMateService.ts:289
(anonymous) @ abstractTextMateService.ts:181
fire @ event.ts:622
_getOrCreateMode @ modeServiceImpl.ts:167
_createModeAndGetLanguageIdentifier @ modeServiceImpl.ts:143
(anonymous) @ modeServiceImpl.ts:136
y @ modeServiceImpl.ts:28
createByFilepathOrFirstLine @ modeServiceImpl.ts:134
getOrCreateMode @ textEditorModel.ts:134
createTextEditorModel @ textEditorModel.ts:90
doCreateTextModel @ textFileEditorModel.ts:510
loadFromContent @ textFileEditorModel.ts:490
loadFromFile @ textFileEditorModel.ts:423
async function (async)
loadFromFile @ textFileEditorModel.ts:410
doLoad @ textFileEditorModel.ts:290
async function (async)
doLoad @ textFileEditorModel.ts:283
load @ textFileEditorModel.ts:270
resolve @ textFileEditorModelManager.ts:306
doCreateReferencedObject @ textModelResolverService.ts:63
createReferencedObject @ textModelResolverService.ts:37
acquire @ lifecycle.ts:265
createModelReference @ textModelResolverService.ts:197
_handleAsResourceInput @ mainThreadDocuments.ts:268
$tryOpenDocument @ mainThreadDocuments.ts:244
_doInvokeHandler @ rpcProtocol.ts:417
_invokeHandler @ rpcProtocol.ts:402
_receiveRequest @ rpcProtocol.ts:318
_receiveOneMessage @ rpcProtocol.ts:245
(anonymous) @ rpcProtocol.ts:110
fire @ event.ts:622
fire @ ipc.net.ts:468
_receiveMessage @ ipc.net.ts:821
(anonymous) @ ipc.net.ts:660
fire @ event.ts:622
acceptChunk @ ipc.net.ts:241
(anonymous) @ ipc.net.ts:202
k @ ipc.net.ts:50
emit @ events.js:315
addChunk @ _stream_readable.js:295
readableAddChunk @ _stream_readable.js:271
Readable.push @ _stream_readable.js:212
onStreamRead @ internal/stream_base_commons.js:186

Please let me know if more info or logs is needed.

No project source file or test is named. Start by reproducing the startup behavior on macOS with the listed Java, Maven, and Python extensions, then inspect the Extension Host error referencing vscjava.vscode-maven/dist/extension.js and the reported dsc process. Done means identifying the extension or entry point that creates the excess processes and documenting a reproducible fix or verification.