Segmentation fault: 11 when debug Promise

Segfault happens when I try to use evaluate command in non stopped process, which logs Promise to console.
node - latest 4 and 5
os - darwin x64

app.js

setInterval(console.log, 100, new Promise(() => {}));

pseudo debugger:

require('net').connect('5858', function() {
  var data = JSON.stringify({
    "seq": 1,
    "type": "request",
    "command": "evaluate",
    "arguments": {
      "global": true,
      "expression": "global"
    }
  });

  this.write(`Content-Length: ${Buffer.byteLength(data, 'utf8')}\r\n\r\n${data}`);
});

$ node --debug app.js
$ node debugger.js

All works fine if process is paused or I don't try to log Promise:

setInterval(() => {
  var p = new Promise(() => {});
  console.log(''); // works fine
}, 100)

Encapsulated test:

var app = require('child_process')
  .exec('node --debug -e "setInterval(console.log, 10, new Promise(() => {}))"')
  .on('exit', () => console.assert(app.signalCode !== 'SIGSEGV', 'Segmentation fault'));

app.stderr.on('data', () => /* wait for `Debugger listening on port 5858`*/
  setTimeout(() =>
    require('net').connect('5858', function() {
      var data = JSON.stringify({
        "seq": 1,
        "type": "request",
        "command": "evaluate",
        "arguments": {
          "global": true,
          "expression": "global" /* global is accessible in global scope */
        }
      });

      this.write(`Content-Length: ${Buffer.byteLength(data, 'utf8')}\r\n\r\n${data}`);
    }), 300 /* small delay to initialize debugger in app */));

"node - latest 4 and 5" Can you be more specific about the exact versions you tried? 5.4.0 was just released the other day. Did you also try with the latest master branch?

I just tried the latest master branch -- can confirm segfault.

Ah, sorry, the line .exec('node --debug -e "setInterval(console.log, 10, new Promise(() => {}))"') ran my global node which is behind master. Does not segfault when I replace that node with ./node, so I think this duplicates #4261.

@davidvgalbraith

I was able to duplicate it on OS X 10.10 with node v5.3.0, but not with v5.4.0.

Can you confirm @davidvgalbraith @3y3 ?

@mscdex

I'm seeing the same thing @mscdex

Ok, sorry, I miss release of 5.4. I can't confirm segfault on 5.4, but code doesn't work correctly:
I add console.log for response from app. I expect two messages:
connection info

Type: connect
V8-Version: 4.6.85.31
Protocol-Version: 1
Embedding-Host: node v5.4.0
Content-Length: 0

and evaluation result, but I receive only connection info.

var app = require('child_process')
  .exec('node --debug -e "setInterval(console.log, 10, Promise.all())"')
  .on('exit', () => console.log(app, app.signalCode !== 'SIGSEGV', 'Segmentation fault'));

app.stderr.on('data', () =>
  setTimeout(() =>
    require('net').connect('5858', function() {
      var data = JSON.stringify({
        "seq": 1,
        "type": "request",
        "command": "evaluate",
        "arguments": {
          "global": true,
          "expression": "global" /* global is accessible in global scope */
        }
      });

      this.on('data', (data) => console.log('' + data));

      this.write(`Content-Length: ${Buffer.byteLength(data, 'utf8')}\r\n\r\n${data}`);

    }), 300 /* small delay to initialize debugger in app */));

@davidvgalbraith

@davidvgalbraith, @mscdex, is there any changes in debugger protocol in 5.4?

Is it possible to backport segfault fix in v4?

@indutny

I also see the difference in debugger statement behavior (difference between 0.10 and latest versions)
In latest versions debugger pauses program if it was started with --debug flag. In 0.10 this happens only in there exists connected debugger.
Is it expected behavior @indutny ?

@3y3

@3y3 #4328 is already tagged for potential inclusion in v4.x.

Ok, I'm ready to close this issue and open one other about stalled debugger #4577 (comment)
Or I can rename this issue.

@3y3

@3y3 I would probably open a new issue and close this one.

Ready #4597

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Segmentation fault: 11 when debug Promise #4577

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Segmentation fault: 11 when debug Promise #4577

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mscdex commented on Jan 8, 2016

davidvgalbraith commented on Jan 8, 2016

davidvgalbraith commented on Jan 8, 2016

mscdex commented on Jan 8, 2016

davidvgalbraith commented on Jan 8, 2016

3y3 commented on Jan 8, 2016

3y3 commented on Jan 8, 2016

3y3 commented on Jan 8, 2016

mscdex commented on Jan 8, 2016

3y3 commented on Jan 8, 2016

mscdex commented on Jan 8, 2016

3y3 commented on Jan 9, 2016

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