After upgrade to 2025.0.0 : "Server[pid=x] is already being debugged" error

[SherekhanFR]

Hello,

since I upgraded to version 2025.0.0, I get error "Server[pid=x] is already being debugged" while debugging Python Azure Function.

if I downgrade to version 2024.14.0 it is working fine.

VSCode on Mac :

Version: 1.97.0
Commit: 33fc5a94a3f99ebe7087e8fe79fbe1d37a251016
Date: 2025-02-04T22:41:26.688Z (2 days ago)
Electron: 32.2.7
ElectronBuildId: 10660205
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Darwin x64 20.6.0

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach to Python Functions",
            "type": "debugpy",
            "request": "attach",
            "connect": {
                "host": "localhost",
                "port": 9091
            },
            "preLaunchTask": "func: host start",
            "logToFile": true,
        }
    ]
}

ms-python.debugpy log file

0 Starting Session:
{
    "name": "Attach to Python Functions",
    "type": "debugpy",
    "request": "attach",
    "connect": {
        "host": "localhost",
        "port": 9091
    },
    "preLaunchTask": "func: host start",
    "logToFile": true,
    "__configurationTarget": 6,
    "clientOS": "unix",
    "debugOptions": [
        "RedirectOutput",
        "ShowReturnValue"
    ],
    "justMyCode": true,
    "showReturnValue": true,
    "workspaceFolder": "/Users/xxx/Workspace/xxxFunctionApp"
}
3 Client <-- Adapter:
{
    "seq": 1,
    "type": "event",
    "event": "output",
    "body": {
        "category": "telemetry",
        "output": "ptvsd",
        "data": {
            "packageVersion": "1.8.12"
        }
    }
}
3 Client <-- Adapter:
{
    "seq": 2,
    "type": "event",
    "event": "output",
    "body": {
        "category": "telemetry",
        "output": "debugpy",
        "data": {
            "packageVersion": "1.8.12"
        }
    }
}
10 Client --> Adapter:
{
    "command": "initialize",
    "arguments": {
        "clientID": "vscode",
        "clientName": "Visual Studio Code",
        "adapterID": "debugpy",
        "pathFormat": "path",
        "linesStartAt1": true,
        "columnsStartAt1": true,
        "supportsVariableType": true,
        "supportsVariablePaging": true,
        "supportsRunInTerminalRequest": true,
        "locale": "en",
        "supportsProgressReporting": true,
        "supportsInvalidatedEvent": true,
        "supportsMemoryReferences": true,
        "supportsArgsCanBeInterpretedByShell": true,
        "supportsMemoryEvent": true,
        "supportsStartDebuggingRequest": true,
        "supportsANSIStyling": true
    },
    "type": "request",
    "seq": 1
}
12 Client <-- Adapter:
{
    "seq": 3,
    "type": "response",
    "request_seq": 1,
    "success": true,
    "command": "initialize",
    "body": {
        "supportsCompletionsRequest": true,
        "supportsConditionalBreakpoints": true,
        "supportsConfigurationDoneRequest": true,
        "supportsDebuggerProperties": true,
        "supportsDelayedStackTraceLoading": true,
        "supportsEvaluateForHovers": true,
        "supportsExceptionInfoRequest": true,
        "supportsExceptionOptions": true,
        "supportsFunctionBreakpoints": true,
        "supportsHitConditionalBreakpoints": true,
        "supportsLogPoints": true,
        "supportsModulesRequest": true,
        "supportsSetExpression": true,
        "supportsSetVariable": true,
        "supportsValueFormattingOptions": true,
        "supportsTerminateRequest": true,
        "supportsGotoTargetsRequest": true,
        "supportsClipboardContext": true,
        "exceptionBreakpointFilters": [
            {
                "filter": "raised",
                "label": "Raised Exceptions",
                "default": false,
                "description": "Break whenever any exception is raised."
            },
            {
                "filter": "uncaught",
                "label": "Uncaught Exceptions",
                "default": true,
                "description": "Break when the process is exiting due to unhandled exception."
            },
            {
                "filter": "userUnhandled",
                "label": "User Uncaught Exceptions",
                "default": false,
                "description": "Break when exception escapes into library code."
            }
        ],
        "supportsStepInTargetsRequest": true
    }
}
13 Client --> Adapter:
{
    "command": "attach",
    "arguments": {
        "name": "Attach to Python Functions",
        "type": "debugpy",
        "request": "attach",
        "connect": {
            "host": "localhost",
            "port": 9091
        },
        "preLaunchTask": "func: host start",
        "logToFile": true,
        "__configurationTarget": 6,
        "clientOS": "unix",
        "debugOptions": [
            "RedirectOutput",
            "ShowReturnValue"
        ],
        "justMyCode": true,
        "showReturnValue": true,
        "workspaceFolder": "/Users/xxx/Workspace/xxxFunctionApp",
        "__sessionId": "xxx"
    },
    "type": "request",
    "seq": 2
}
14 Client <-- Adapter:
{
    "seq": 4,
    "type": "event",
    "event": "debugpyWaitingForServer",
    "body": {
        "host": "127.0.0.1",
        "port": 50981
    }
}
23 Client <-- Adapter:
{
    "seq": 5,
    "type": "response",
    "request_seq": 2,
    "success": false,
    "command": "attach",
    "message": "Server[pid=18781] is already being debugged."
}
24 Client --> Adapter:
{
    "command": "disconnect",
    "arguments": {
        "restart": false
    },
    "type": "request",
    "seq": 3
}
25 Client <-- Adapter:
{
    "seq": 6,
    "type": "event",
    "event": "terminated"
}
26 Client <-- Adapter:
{
    "seq": 7,
    "type": "response",
    "request_seq": 3,
    "success": true,
    "command": "disconnect"
}
26 Stopping Session
28 Error:
{}

[andriimazur93]

@SherekhanFR I downgraded the version of the extension "Python Debugger" to v2024.14.0, now debugging of azure functions is working again