Flaky parallel/test-fs-error-messages

[BridgeAR]

https://ci.nodejs.org/job/node-test-commit-linux/16242/nodes=alpine36-container-x64/console

not ok 465 parallel/test-fs-error-messages
  ---
  duration_ms: 0.293
  severity: fail
  stack: |-
    /home/iojs/build/workspace/node-test-commit-linux/nodes/alpine36-container-x64/test/parallel/test-fs-error-messages.js:90
        assert.strictEqual(err.message, 'EBADF: bad file descriptor, fstat');
                               ^
    
    TypeError: Cannot read property 'message' of null
        at validateError (/home/iojs/build/workspace/node-test-commit-linux/nodes/alpine36-container-x64/test/parallel/test-fs-error-messages.js:90:28)
        at /home/iojs/build/workspace/node-test-commit-linux/nodes/alpine36-container-x64/test/common/index.js:475:15
        at FSReqWrap.oncomplete (fs.js:285:5)

[joyeecheung]

This could be caused by a race condition of the invalid fd generation...I could think of an alternative way of getting those (e.g. starting from 1 << 30 and counting down, usually that should be invalid from the start).