Investigate flaky test-preload.js

[Trott]

• Version: master branch
• Platform: CentOS 5, 32-bit
• Subsystem: module?

Failure in CI:
https://ci.nodejs.org/job/node-test-commit-linux/3349/nodes=centos5-32/tapTestReport/test.tap-677/

/cc @bmeck

[Trott]

/cc @nodejs/testing

[Trott]

/cc @Fishrock123

[Fishrock123]

Not sure why we now have 3 issues open, so I'll close the AIX one. PR (WIP now): #6718

[Trott]

Also failing intermittently on CentOS 7 64-bit:

• https://ci.nodejs.org/job/node-test-commit-linux/3357/nodes=centos7-64/tapTestReport/test.tap-676/
• https://ci.nodejs.org/job/node-test-commit-linux/3359/nodes=centos7-64/tapTestReport/test.tap-676/
• https://ci.nodejs.org/job/node-test-commit-linux/3362/nodes=centos7-64/tapTestReport/test.tap-676/

[Fishrock123]

Here's a new one:

https://ci.nodejs.org/job/node-test-commit-linux/3370/nodes=centos7-64/tapTestReport/test.tap-676/ from #5958

# 
# assert.js:90
# throw new assert.AssertionError({
# ^
# AssertionError: '' == 'A\n> '
# at ChildProcess.<anonymous> (/home/iojs/build/workspace/node-test-commit-linux/nodes/centos7-64/test/parallel/test-preload.js:106:10)
# at emitTwo (events.js:106:13)
# at ChildProcess.emit (events.js:191:7)
# at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)

Haven't seen this output before.

[jasnell]

And another (also centos7-64):

https://ci.nodejs.org/job/node-test-commit-linux/3379/nodes=centos7-64/console

not ok 678 test-preload.js
# 
# assert.js:90
#   throw new assert.AssertionError({
#   ^
# AssertionError: '' == 'A\nhello\n'
#     at ChildProcess.<anonymous> (/home/iojs/build/workspace/node-test-commit-linux/nodes/centos7-64/test/parallel/test-preload.js:86:10)
#     at emitTwo (events.js:106:13)
#     at ChildProcess.emit (events.js:191:7)
#     at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)
  ---
  duration_ms: 0.463