Investigate flaky test-child-process-execFile

[Trott]

https://ci.nodejs.org/job/node-test-commit-aix/19688/nodes=aix61-ppc64/consoleText

test-osuosl-aix61-ppc64_be-1

ot ok 217 parallel/test-child-process-execfile
  ---
  duration_ms: 4.640
  severity: fail
  exitcode: 1
  stack: |-
    assert.js:86
      throw new AssertionError(obj);
      ^
    
    AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
    
    null !== 42
    
        at common.mustCall (/home/iojs/build/workspace/node-test-commit-aix/nodes/aix61-ppc64/test/parallel/test-child-process-execfile.js:20:14)
        at /home/iojs/build/workspace/node-test-commit-aix/nodes/aix61-ppc64/test/common/index.js:335:15
        at ChildProcess.exithandler (child_process.js:301:5)
        at ChildProcess.emit (events.js:189:13)
        at maybeClose (internal/child_process.js:978:16)
        at Process.ChildProcess._handle.onexit (internal/child_process.js:265:5)
  ...

[gireeshpunathil]

I will investigate this too when I get CI access through nodejs/build#1637

[Trott]

Same test dumped core on ubuntu1604_sharedlibs_debug_x64:

test-digitalocean-ubuntu1604_sharedlibs_container-x64-8

https://ci.nodejs.org/job/node-test-commit-linux-containered/9419/nodes=ubuntu1604_sharedlibs_debug_x64/consoleText

not ok 267 parallel/test-child-process-execfile
  ---
  duration_ms: 1.439
  severity: fail
  exitcode: 1
  stack: |-
    assert.js:753
        throw newErr;
        ^
    
    AssertionError [ERR_ASSERTION]: ifError got unwanted exception: Command failed: /home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node /home/iojs/build/workspace/node-test-commit-linux-containered/test/fixtures/exit.js 0
    Segmentation fault (core dumped)
    
        at ChildProcess.exithandler (child_process.js:294:12)
        at ChildProcess.emit (events.js:189:13)
        at maybeClose (internal/child_process.js:978:16)
        at Socket.stream.socket.on (internal/child_process.js:396:11)
        at Socket.emit (events.js:189:13)
        at Pipe._handle.close (net.js:612:12)
  ...

[gireeshpunathil]

got one core file in 40th iteration, in the CI.

0x110378be0 (???) 00000000       Invalid opcode.
(dbx) where
.() at 0x110378be0
array-buffer-collector._ZN2v88internal20CancelableLambdaTaskIZNS0_20ArrayBufferCollector15FreeAllocationsEvEUlvE_E11RunInternalEv(??) at 0x1011caca4
_ZN2v88internal14CancelableTask3RunEv(??) at 0x100039304
node_platform._ZN4node12_GLOBAL__N_1L20PlatformWorkerThreadEPv(??) at 0x1001e6970
(dbx) 

did not bother to debug further - needless to say, this is same as described in #25007

Mark as flaky, wait till #25007 is resolved is the way forward.