Open
Description
- Version: 16.2.0
- Platform: Microsoft Windows NT 10.0.19042.0 x64
- Subsystem: inspector
This is probably similar to #38420, but reporting it for visibility.
What steps will reproduce the bug?
In a debugger that's worker_thread capable, namely in VS Code:
-
Create these files:
index.js
const { Worker, isMainThread } = require('worker_threads'); if (isMainThread) { const worker = new Worker(__filename, { // env: {} }); } else { console.log('hello world'); }
empty.js
.vscode/launch.json
{ "version": "0.2.0", "configurations": [ { "name": "Launch Program", "program": "${workspaceFolder}/index.js", "request": "launch", "type": "pwa-node" } ] } -
Debug it (by hitting F5). It should run through and exit.
-
Uncomment line 5. Debug it. It pauses when the worker thread is launched. 🐛
-
Replace line 5 with
env: { NODE_OPTIONS:--require ${__dirname}/empty.js}. Debug it. It no longer pauses.
How often does it reproduce? Is there a required condition?
100%
What is the expected behavior?
In no case should the debugger pause when entering the worker_thread.
What do you see instead?
It pauses if there is nothing --required in the NODE_OPTIONS. But even requiring an empty file, which I would expect to have no effect, fixes the issue.
Additional information
This is the "paused" event sent from Node in the env: {} case:
{
"method": "Debugger.paused",
"params": {
"callFrames": [
{
"callFrameId": "-1076361671936602912.1.0",
"functionName": "",
"functionLocation": {
"scriptId": "102",
"lineNumber": 0,
"columnNumber": 0
},
"location": {
"scriptId": "102",
"lineNumber": 0,
"columnNumber": 33
},
"url": "file:///e:/Downloads/vscode-debug-test/index.js",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.1"
},
"startLocation": {
"scriptId": "102",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "102",
"lineNumber": 9,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.2"
}
}
],
"this": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.3"
}
},
{
"callFrameId": "-1076361671936602912.1.1",
"functionName": "Module._compile",
"functionLocation": {
"scriptId": "79",
"lineNumber": 1062,
"columnNumber": 36
},
"location": {
"scriptId": "79",
"lineNumber": 1105,
"columnNumber": 13
},
"url": "node:internal/modules/cjs/loader",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.4"
},
"name": "Module._compile",
"startLocation": {
"scriptId": "79",
"lineNumber": 1062,
"columnNumber": 36
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1114,
"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.5"
},
"startLocation": {
"scriptId": "79",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1274,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.6"
}
}
],
"this": {
"type": "object",
"className": "Module",
"description": "Module",
"objectId": "-1076361671936602912.1.7"
}
},
{
"callFrameId": "-1076361671936602912.1.2",
"functionName": "Module._extensions..js",
"functionLocation": {
"scriptId": "79",
"lineNumber": 1117,
"columnNumber": 36
},
"location": {
"scriptId": "79",
"lineNumber": 1137,
"columnNumber": 9
},
"url": "node:internal/modules/cjs/loader",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.8"
},
"name": "Module._extensions..js",
"startLocation": {
"scriptId": "79",
"lineNumber": 1117,
"columnNumber": 36
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1138,
"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.9"
},
"startLocation": {
"scriptId": "79",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1274,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.10"
}
}
],
"this": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.11"
}
},
{
"callFrameId": "-1076361671936602912.1.3",
"functionName": "Module.load",
"functionLocation": {
"scriptId": "79",
"lineNumber": 976,
"columnNumber": 32
},
"location": {
"scriptId": "79",
"lineNumber": 988,
"columnNumber": 31
},
"url": "node:internal/modules/cjs/loader",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.12"
},
"name": "Module.load",
"startLocation": {
"scriptId": "79",
"lineNumber": 976,
"columnNumber": 32
},
"endLocation": {
"scriptId": "79",
"lineNumber": 999,
"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.13"
},
"startLocation": {
"scriptId": "79",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1274,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.14"
}
}
],
"this": {
"type": "object",
"className": "Module",
"description": "Module",
"objectId": "-1076361671936602912.1.15"
}
},
{
"callFrameId": "-1076361671936602912.1.4",
"functionName": "Module._load",
"functionLocation": {
"scriptId": "79",
"lineNumber": 752,
"columnNumber": 23
},
"location": {
"scriptId": "79",
"lineNumber": 828,
"columnNumber": 13
},
"url": "node:internal/modules/cjs/loader",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.16"
},
"name": "Module._load",
"startLocation": {
"scriptId": "79",
"lineNumber": 752,
"columnNumber": 23
},
"endLocation": {
"scriptId": "79",
"lineNumber": 853,
"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.17"
},
"startLocation": {
"scriptId": "79",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "79",
"lineNumber": 1274,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.18"
}
}
],
"this": {
"type": "function",
"className": "Function",
"description": "function Module(id = '', parent) {\r\n this.id = id;\r\n this.path = path.dirname(id);\r\n this.exports = {};\r\n moduleParentCache.set(this, parent);\r\n updateChildren(parent, this, false);\r\n this.filename = null;\r\n this.loaded = false;\r\n this.children = [];\r\n}",
"objectId": "-1076361671936602912.1.19"
}
},
{
"callFrameId": "-1076361671936602912.1.5",
"functionName": "executeUserEntryPoint",
"functionLocation": {
"scriptId": "101",
"lineNumber": 68,
"columnNumber": 30
},
"location": {
"scriptId": "101",
"lineNumber": 75,
"columnNumber": 11
},
"url": "node:internal/modules/run_main",
"scopeChain": [
{
"type": "block",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.20"
},
"name": "executeUserEntryPoint",
"startLocation": {
"scriptId": "101",
"lineNumber": 68,
"columnNumber": 55
},
"endLocation": {
"scriptId": "101",
"lineNumber": 77,
"columnNumber": 1
}
},
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.21"
},
"name": "executeUserEntryPoint",
"startLocation": {
"scriptId": "101",
"lineNumber": 68,
"columnNumber": 30
},
"endLocation": {
"scriptId": "101",
"lineNumber": 77,
"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.22"
},
"startLocation": {
"scriptId": "101",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "101",
"lineNumber": 83,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.23"
}
}
],
"this": {
"type": "function",
"className": "Function",
"description": "function Module(id = '', parent) {\r\n this.id = id;\r\n this.path = path.dirname(id);\r\n this.exports = {};\r\n moduleParentCache.set(this, parent);\r\n updateChildren(parent, this, false);\r\n this.filename = null;\r\n this.loaded = false;\r\n this.children = [];\r\n}",
"objectId": "-1076361671936602912.1.24"
}
},
{
"callFrameId": "-1076361671936602912.1.6",
"functionName": "",
"functionLocation": {
"scriptId": "71",
"lineNumber": 99,
"columnNumber": 19
},
"location": {
"scriptId": "71",
"lineNumber": 182,
"columnNumber": 23
},
"url": "node:internal/main/worker_thread",
"scopeChain": [
{
"type": "block",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.25"
},
"startLocation": {
"scriptId": "71",
"lineNumber": 100,
"columnNumber": 36
},
"endLocation": {
"scriptId": "71",
"lineNumber": 184,
"columnNumber": 3
}
},
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.26"
},
"startLocation": {
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},
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"columnNumber": 1
}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
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},
"startLocation": {
"scriptId": "71",
"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "71",
"lineNumber": 252,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.28"
}
}
],
"this": {
"type": "undefined"
}
},
{
"callFrameId": "-1076361671936602912.1.7",
"functionName": "[nodejs.internal.kHybridDispatch]",
"functionLocation": {
"scriptId": "37",
"lineNumber": 413,
"columnNumber": 19
},
"location": {
"scriptId": "37",
"lineNumber": 460,
"columnNumber": 19
},
"url": "node:internal/event_target",
"scopeChain": [
{
"type": "block",
"object": {
"type": "object",
"className": "Object",
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},
"name": "[nodejs.internal.kHybridDispatch]",
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},
{
"type": "local",
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},
{
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},
{
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"objectId": "-1076361671936602912.1.32"
}
}
],
"this": {
"type": "object",
"className": "MessagePort",
"description": "MessagePort",
"objectId": "-1076361671936602912.1.33"
}
},
{
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"functionName": "exports.emitMessage",
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"lineNumber": 18,
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},
"location": {
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},
"url": "",
"scopeChain": [
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
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},
"name": "exports.emitMessage",
"startLocation": {
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},
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}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.35"
},
"startLocation": {
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"columnNumber": 0
},
"endLocation": {
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"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
"objectId": "-1076361671936602912.1.36"
}
}
],
"this": {
"type": "object",
"className": "MessagePort",
"description": "MessagePort",
"objectId": "-1076361671936602912.1.37"
}
},
{
"callFrameId": "-1076361671936602912.1.9",
"functionName": "callbackTrampoline",
"functionLocation": {
"scriptId": "24",
"lineNumber": 117,
"columnNumber": 27
},
"location": {
"scriptId": "24",
"lineNumber": 129,
"columnNumber": 16
},
"url": "node:internal/async_hooks",
"scopeChain": [
{
"type": "block",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
"objectId": "-1076361671936602912.1.38"
},
"name": "callbackTrampoline",
"startLocation": {
"scriptId": "24",
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},
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}
},
{
"type": "local",
"object": {
"type": "object",
"className": "Object",
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},
"name": "callbackTrampoline",
"startLocation": {
"scriptId": "24",
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}
},
{
"type": "closure",
"object": {
"type": "object",
"className": "Object",
"description": "Object",
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},
"startLocation": {
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"lineNumber": 0,
"columnNumber": 0
},
"endLocation": {
"scriptId": "24",
"lineNumber": 591,
"columnNumber": 0
}
},
{
"type": "global",
"object": {
"type": "object",
"className": "global",
"description": "global",
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}
}
],
"this": {
"type": "object",
"className": "MessagePort",
"description": "MessagePort",
"objectId": "-1076361671936602912.1.42"
}
}
],
"reason": "Break on start",
"hitBreakpoints": []
}
}
You can add trace: true to the launch.json, which will produce a file containing all traffic to and from the debugger that can be inspected here.
Note that the program is not launched with --inspect-brk (in which case this behavior would be expected)
This was originally reported in microsoft/vscode#125451