Debugger shutdown unexpectedly

[jansedlon]

Summary

Debugger shutdown unexpectedly

Description

I just got access to the Zed debugger so i started up my remix.run application, created new debug session using the Attach to Node option and the debugger immediately crashed

Steps to reproduce:

1. Open up remix.run project
2. Start it with --inspect option
3. Start new Attach to node debugger sessions

Expected Behavior:
It should at least not crash
Actual Behavior:
It crashed

{
  "format_on_save": "on",
  "ui_font_size": 12,
  "buffer_font_size": 12,
  "language_overrides": {
    "TSX": {
      "language_servers": ["!typescript-language-server", "vtsls"]
    },
    "TS": {
      "language_servers": ["!typescript-language-server", "vtsls"]
    }
  }
}

2025-06-17T08:12:48+02:00 ERROR [project] no adapter running to send request: ThreadsCommand
2025-06-17T08:12:56+02:00 INFO  [dap::transport] Debug adapter has connected to TCP server 127.0.0.1:9229
2025-06-17T08:12:56+02:00 INFO  [dap::client] Successfully connected to debug adapter
2025-06-17T08:12:56+02:00 ERROR [dap::transport] Error handling debugger output: missing content length
2025-06-17T08:12:56+02:00 ERROR [debugger_ui::debugger_panel] debugger shutdown unexpectedly
2025-06-17T08:12:56+02:00 ERROR [project] Could not find session: SessionId(0)
2025-06-17T08:12:56+02:00 INFO  [dap::transport] Debugger closed its error stream
2025-06-17T08:12:56+02:00 INFO  [dap::transport] Debugger logs connection closed
2025-06-17T08:13:23+02:00 ERROR [project] Could not find session: SessionId(0)
2025-06-17T08:13:23+02:00 ERROR [dap::transport] Error handling debugger input: Broken pipe (os error 32)
2025-06-17T08:13:31+02:00 ERROR [project] no adapter running to send request: ThreadsCommand
2025-06-17T08:13:31+02:00 INFO  [dap::transport] Debug adapter has connected to TCP server 127.0.0.1:9229
2025-06-17T08:13:31+02:00 INFO  [dap::client] Successfully connected to debug adapter
2025-06-17T08:13:31+02:00 ERROR [dap::transport] Error handling debugger output: missing content length
2025-06-17T08:13:31+02:00 ERROR [debugger_ui::debugger_panel] debugger shutdown unexpectedly
2025-06-17T08:13:31+02:00 ERROR [project] Could not find session: SessionId(1)
2025-06-17T08:13:31+02:00 INFO  [dap::transport] Debugger logs connection closed
2025-06-17T08:13:31+02:00 INFO  [dap::transport] Debugger closed its error stream
2025-06-17T08:13:52+02:00 INFO  [db] Opening main db

Zed Version and System Specs

Zed: v0.191.3 (Zed Preview)
OS: macOS Tahoe 26.0.0
Memory: 48 GiB
Architecture: aarch64

[ConradIrwin]

@jansedlon just to confirm, port 9229 was the port the debugger was running on (not the port that the web server is running on?).

It looks like we couldn't parse the responses for some reason.

[jansedlon]

@ConradIrwin Yes it should, this is what's in my terminal when i start up the app with inspect options

Debugger listening on ws://127.0.0.1:9229/0e59326b-8d5a-45e4-beb6-2ee393d2d535

[osiewicz]

Can you please share your .vscode/launch.json/.zed/debug.json?

[jansedlon]

@osiewicz

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Launch via NPM",
      "request": "launch",
      "runtimeArgs": ["run-script", "dev"],
      "runtimeExecutable": "pnpm",
      "skipFiles": ["<node_internals>/**"],
      "type": "node"
    },
    {
      "name": "dev",
      "request": "launch",
      "runtimeArgs": ["run-script", "dev"],
      "runtimeExecutable": "npm",
      "skipFiles": ["<node_internals>/**"],
      "type": "node",
      "cwd": "${workspaceFolder}/apps/web"
    },
    {
      "request": "attach",
      "type": "node",
      "name": "Attach to Node",
      "port": 9229,
      "sourceMaps": true,
      "outFiles": ["${workspaceFolder}/**/*.js"],
      "skipFiles": ["<node_internals>/**"],
      "resolveSourceMapLocations": [
        "${workspaceFolder}/**",
        "!**/node_modules/**"
      ]
    }
  ]
}

I didn't have debug.json for Zed but when I created this one, the same error occured

[
  {
    "label": "Attach to Node",
    "adapter": "JavaScript",
    "request": "attach",
    "port": 9229,
    "sourceMaps": true,
    "outFiles": ["${ZED_WORKTREE_ROOT}/**/*.js", "!**/node_modules/**"],
    "skipFiles": ["<node_internals>/**"],
    "resolveSourceMapLocations": [
      "${ZED_WORKTREE_ROOT}/**",
      "!**/node_modules/**"
    ]
  }
]

2025-06-17T08:50:13+02:00 ERROR [project] no adapter running to send request: ThreadsCommand
2025-06-17T08:50:13+02:00 INFO  [dap::transport] Debug adapter has connected to TCP server 127.0.0.1:55748
2025-06-17T08:50:13+02:00 INFO  [dap::client] Successfully connected to debug adapter
2025-06-17T08:50:13+02:00 INFO  [dap::transport] Debugger closed the connection
2025-06-17T08:50:13+02:00 ERROR [debugger_ui::debugger_panel] debugger shutdown unexpectedly
2025-06-17T08:50:13+02:00 ERROR [project] Could not find session: SessionId(3)
2025-06-17T08:50:21+02:00 ERROR [project] no adapter running to send request: ThreadsCommand
2025-06-17T08:50:21+02:00 INFO  [dap::transport] Debug adapter has connected to TCP server 127.0.0.1:55772
2025-06-17T08:50:21+02:00 INFO  [dap::client] Successfully connected to debug adapter
2025-06-17T08:50:21+02:00 INFO  [dap::transport] Debugger closed the connection
2025-06-17T08:50:21+02:00 ERROR [debugger_ui::debugger_panel] debugger shutdown unexpectedly
2025-06-17T08:50:21+02:00 ERROR [project] Could not find session: SessionId(4)

[osiewicz]

That's the debug log in my sample project:

stderr: Error: Could not connect to debug target at http://localhost:9229: Could not find any debuggable target

stderr:     at /Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:95:48960

stderr:     at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

stderr:     at async n (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:100:3525)

stderr:     at async eu.launch (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:98:31577)

stderr:     at async Dg.captureLaunch (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:104:9517)

stderr:     at async Dg._launch (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:104:9264)

stderr:     at async Promise.all (index 4)

stderr:     at async Dg._boot (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:104:8388)

stderr:     at async Server.<anonymous> (/Users/hiro/Library/Application Support/Zed/debug_adapters/JavaScript/JavaScript_v1.100.1/js-debug/src/dapDebugServer.js:110:3656)

And initialization log:

// Send
{
  "type": "request",
  "seq": 1,
  "command": "initialize",
  "arguments": {
    "clientID": "zed",
    "clientName": "Zed",
    "adapterID": "JavaScript",
    "locale": "en-US",
    "linesStartAt1": true,
    "columnsStartAt1": true,
    "pathFormat": "path",
    "supportsVariableType": true,
    "supportsVariablePaging": false,
    "supportsRunInTerminalRequest": true,
    "supportsMemoryReferences": true,
    "supportsProgressReporting": false,
    "supportsInvalidatedEvent": false,
    "supportsMemoryEvent": false,
    "supportsArgsCanBeInterpretedByShell": false,
    "supportsStartDebuggingRequest": true,
    "supportsANSIStyling": true
  }
}
// Receive
{
  "seq": 1,
  "type": "response",
  "request_seq": 1,
  "command": "initialize",
  "success": true,
  "body": {
    "supportsConfigurationDoneRequest": true,
    "supportsFunctionBreakpoints": false,
    "supportsConditionalBreakpoints": true,
    "supportsHitConditionalBreakpoints": true,
    "supportsEvaluateForHovers": true,
    "supportsReadMemoryRequest": true,
    "supportsWriteMemoryRequest": true,
    "exceptionBreakpointFilters": [
      {
        "filter": "all",
        "label": "Caught Exceptions",
        "default": false,
        "supportsCondition": true,
        "description": "Breaks on all throw errors, even if they're caught later.",
        "conditionDescription": "error.name == \"MyError\""
      },
      {
        "filter": "uncaught",
        "label": "Uncaught Exceptions",
        "default": false,
        "supportsCondition": true,
        "description": "Breaks only on errors or promise rejections that are not handled.",
        "conditionDescription": "error.name == \"MyError\""
      }
    ],
    "supportsStepBack": false,
    "supportsSetVariable": true,
    "supportsRestartFrame": true,
    "supportsGotoTargetsRequest": false,
    "supportsStepInTargetsRequest": true,
    "supportsCompletionsRequest": true,
    "supportsModulesRequest": false,
    "additionalModuleColumns": [],
    "supportedChecksumAlgorithms": [],
    "supportsRestartRequest": true,
    "supportsExceptionOptions": false,
    "supportsValueFormattingOptions": true,
    "supportsExceptionInfoRequest": true,
    "supportTerminateDebuggee": true,
    "supportsDelayedStackTraceLoading": true,
    "supportsLoadedSourcesRequest": true,
    "supportsLogPoints": true,
    "supportsTerminateThreadsRequest": false,
    "supportsSetExpression": true,
    "supportsTerminateRequest": false,
    "completionTriggerCharacters": [
      ".",
      "[",
      "\"",
      "'"
    ],
    "supportsBreakpointLocationsRequest": true,
    "supportsClipboardContext": true,
    "supportsExceptionFilterOptions": true,
    "supportsEvaluationOptions": false,
    "supportsDebuggerProperties": false,
    "supportsSetSymbolOptions": false,
    "supportsANSIStyling": true
  }
}
// Send
{
  "type": "request",
  "seq": 2,
  "command": "attach",
  "arguments": {
    "request": "attach",
    "sourceMaps": true,
    "outFiles": [
      "/Users/hiro/Projects/repros/debuggers/32836-node-attach/**/*.js"
    ],
    "skipFiles": [
      "<node_internals>/**"
    ],
    "resolveSourceMapLocations": [
      "/Users/hiro/Projects/repros/debuggers/32836-node-attach/**",
      "!**/node_modules/**"
    ],
    "type": "pwa-node",
    "port": 9229,
    "cwd": "/Users/hiro/Projects/repros/debuggers/32836-node-attach"
  }
}
{
  "type": "request",
  "seq": 4,
  "command": "configurationDone",
  "arguments": {}
}
// Receive
{
  "seq": 4,
  "type": "response",
  "request_seq": 4,
  "command": "configurationDone",
  "success": true,
  "body": {}
}

[osiewicz]

In my repros I've spotted at least one issue with how we translate the debug config that could be causing issues here. I'm not actually positive whether your issue is going to be resolved altogether without a concrete repro; I'd be happy to jump on an onboarding call with you if you have some time (in case the fix does not do the trick for you): https://cal.com/team/zed-research/debugger