Investigate flaky parallel/test-worker-process-cwd

[ZYSzys]

• Version: master
• Platform: macOS
• Subsystem: worker

On node-test-commit-osx 26791

18:20:37 not ok 2246 parallel/test-worker-process-cwd
18:20:37   ---
18:20:37   duration_ms: 0.332
18:20:37   severity: fail
18:20:37   exitcode: 1
18:20:37   stack: |-
18:20:37     assert.js:89
18:20:37       throw new AssertionError(obj);
18:20:37       ^
18:20:37     
18:20:37     AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
18:20:37     + actual - expected
18:20:37     
18:20:37     + '/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1011'
18:20:37     - '/Users/iojs/build/workspace/node-test-commit-osx/nodes'
18:20:37         at Worker.<anonymous> (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1011/test/parallel/test-worker-process-cwd.js:16:12)
18:20:37         at Worker.<anonymous> (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1011/test/common/index.js:373:15)
18:20:37         at Worker.emit (events.js:196:13)
18:20:37         at MessagePort.<anonymous> (internal/worker.js:142:55)
18:20:37         at MessagePort.emit (events.js:196:13)
18:20:37         at MessagePort.onmessage (internal/worker/io.js:68:8)
18:20:37   ...

I can reproduce using python tools/test.py -J --repeat=1000 --mode=release parallel/test-worker-process-cwd on macOS.