Flaky parallel/test-trace-events-fs-sync

Test failing occasionally on FreeBSD with different assertion failures:

https://ci.nodejs.org/job/node-test-commit-freebsd/18147/ (#20962)

assert.js:80
  throw new AssertionError(obj);
  ^

AssertionError [ERR_ASSERTION]: fs.sync.access:
    at Object.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/parallel/test-trace-events-fs-sync.js:131:10)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
    at startup (internal/bootstrap/node.js:239:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:573:3)

https://ci.nodejs.org/job/node-test-commit-freebsd/18103/ (#21003)

assert.js:80
  throw new AssertionError(obj);
  ^

AssertionError [ERR_ASSERTION]: fs.sync.ftruncate:
    at Object.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/parallel/test-trace-events-fs-sync.js:131:10)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
    at startup (internal/bootstrap/node.js:239:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:573:3)

https://ci.nodejs.org/job/node-test-commit-freebsd/18143/ (#21032)

assert.js:80
  throw new AssertionError(obj);
  ^

AssertionError [ERR_ASSERTION]: fs.sync.readlink:
    at Object.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/parallel/test-trace-events-fs-sync.js:131:10)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
    at startup (internal/bootstrap/node.js:239:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:573:3)