gistfile1.js

//
// Node Child Process Spawn() race bug
//
// Triggerable on:
//  Node 0.8.11 / OS X 10.8.2 / MBP 13" 2011 (4 cores)
// Doesn't seem to happen on:
//  Node 0.8.11 / Ubuntu 10.04 LTS / EC2 Medium (1 core)


var assert = require('assert')
var spawn = require('child_process').spawn

function runTest(cb) {
  var proc = spawn("/usr/bin/env", [], {env:{foo:"bar"}})

  proc.stdoutBuf = ""
  proc.stderrBuf = ""
  proc.stdmergedBuf = ""

  proc.stdout.on('data', function(buf) {
    proc.stdoutBuf += buf
    proc.stdmergedBuf += buf
  })

  proc.stderr.on('data', function(buf) {
    proc.stderrBuf += buf
    proc.stdmergedBuf += buf
  })

  proc.on('exit', function(exitCode) {
    console.log(proc.stdoutBuf)
    assert.notEqual(proc.stdoutBuf.length, 0, "proc.stdoutBuf has length 0!")
    if (cb) cb()
  })

  return proc
}

var i = 0
function cb() {
  i++
  // Run in a loop until it is triggered
  if (i < 3000) runTest(cb)

}
runTest(cb)