8000 Lost connection to device when ffi with process a command · Issue #60486 · dart-lang/sdk · GitHub
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orange-pig opened this issue Apr 7, 2025 · 6 comments
Open

Lost connection to device when ffi with process a command #60486

orange-pig opened this issue Apr 7, 2025 · 6 comments
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area-vm Use area-vm for VM related issues, including code coverage, and the AOT and JIT backends. triaged Issue has been triaged by sub team vm-native

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@orange-pig
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orange-pig commented Apr 7, 2025 •
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Steps to reproduce

  1. Impl a rust func process a command
  2. build to dynamic library copy to flutter Debug folder
  3. use the rust c func in flutter by ffi
  4. Lost connection to device after begin debug 60 ~ 90 seconds

Debug console log:

Connecting to VM Service at ws://127.0.0.1:6807/VVyk-SlkSlE=/ws
Connected to the VM Service.

Lost connection to device.

Exited.

OS: Windows 10 22H2

Flutter version:

Flutter 3.29.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision c236373904 (3 weeks ago) • 2025-03-13 16:17:06 -0400
Engine • revision 18b71d647a
Tools • Dart 3.7.2 • DevTools 2.42.3

Rust version

rustc 1.84.1 (e71f9a9a9 2025-01-27)

Expected results

The debugger won't exit

Actual results

The debugger exits, but the flutter process is still running and the window works fine

Code sample

Code sample

main.dart:

import 'dart:ffi';

import 'package:flutter/material.dart';

typedef _RunNative = Void Function();
typedef _RunDart = void Function();

void main() {
  final dylib = DynamicLibrary.open(r"./rust_command_lib.dll");
  final run = dylib.lookupFunction<_RunNative, _RunDart>('run');
  run();

  runApp(const MyApp());
}

lib.rs:

use std::process::Command;

#[no_mangle]
pub extern "C" fn run() {
    let output = Command::new("calc").output().expect("failed running calc");
    let stdout = String::from_utf8_lossy(&output.stdout);
    println!("{}", stdout)
}

Cargo.toml:

[package]
name = "rust_command_lib"
version = "0.1.0"
edition = "2021"

[dependencies]

[lib]
name = "rust_command_lib"
crate-type = ["cdylib"]

Screenshots or Video

Screenshots / Video demonstration

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@mraleph
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mraleph commented Apr 7, 2025

and the window works fine

Is the window actually still interactive? (e.g. does it do anything when you press +)?

@lrhn lrhn added area-vm Use area-vm for VM related issues, including code coverage, and the AOT and JIT backends. vm-native labels Apr 7, 2025
@orange-pig
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Is the window actually still interactive? (e.g. does it do anything when you press +)?

Yes, look like only debuger loss connect.

Additional：

  1. Run the release execute, and a cmd window will appear when it starts.
  2. There is a small chance that the main window will automatically exit

@a-siva a-siva added the triaged Issue has been triaged by sub team label Apr 9, 2025
@a-siva
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a-siva commented Apr 9, 2025

//cc @derekxu16 @jyameo could one of you try reproducing the above scenario to see if the problem is reproducible,

@derekxu16
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I wasn't able to reproduce it. I tried using the exact same code as in the repro instructions with Flutter 3.29.2 on Windows. I left the app running for 3 minutes and never saw "Lost connection to device."

@orange-pig
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Something is wrong maybe.
A demo that must appear on my windows: https://github.com/orange-pig/demo_issue_lost_connection_to_device

@orange-pig
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