Repository: node
Issue: investigate flaky test-cpu-prof
Labels: flaky-test

https://ci.nodejs.org/job/node-test-commit-freebsd/26122/nodes=freebsd11-x64/console

test-digitalocean-freebsd11-x64-2

<details>

```console
00:15:35 not ok 2553 sequential/test-cpu-prof
00:15:35   ---
00:15:35   duration_ms: 2.101
00:15:35   severity: fail
00:15:35   exitcode: 1
00:15:35   stack: |-
00:15:35     Dispatching message { "id": 1, "method": "Profiler.enable" }
00:15:35     Receive CPU profile message, ending = false
00:15:35     Dispatching message { "id": 2, "method": "Profiler.start" }
00:15:35     Receive CPU profile message, ending = false
00:15:35     Dispatching message { "id": 3, "method": "Profiler.setSamplingInterval", "params": { "interval": 50 } }
00:15:35     Receive CPU profile message, ending = false
00:15:35     Dispatching message { "id": 1, "method": "Profiler.enable" }
00:15:35     Receive CPU profile message, ending = false
00:15:35     Dispatching message { "id": 2, "method": "Profiler.start" }
00:15:35     Receive CPU profile message, ending = false
00:15:35     Dispatching message { "id": 3, "method": "Profiler.setSamplingInterval", "params": { "interval": 50 } }
00:15:35     Receive CPU profile message, ending = false
00:15:35     EndStartedProfilers
00:15:35     Ending cpu profiling
00:15:35     Dispatching message { "id": 4, "method": "Profiler.stop" }
00:15:35     Receive CPU profile message, ending = true
00:15:35     Written result to prof/CPU.20190508.071535.5764.1.002.cpuprofile
00:15:35     EndStartedProfilers
00:15:35     Ending cpu profiling
00:15:35     Dispatching message { "id": 4, "method": "Profiler.stop" }
00:15:35     Receive CPU profile message, ending = true
00:15:35     Written result to prof/CPU.20190508.071535.5764.0.001.cpuprofile
00:15:35     
00:15:35     CPU path:  /usr/home/iojs/node-tmp/.tmp.0/prof/CPU.20190508.071535.5764.0.001.cpuprofile
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00:15:36         positionTicks: [ [Object] ]
00:15:36       },
00:15:36       {
00:15:36         id: 37,
00:15:36         callFrame: {
00:15:36           functionName: 'onmessage',
00:15:36           scriptId: '20',
00:15:36           url: 'internal/worker/io.js',
00:15:36           lineNumber: 63,
00:15:36           columnNumber: 62
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 38 ]
00:15:36       },
00:15:36       {
00:15:36         id: 38,
00:15:36         callFrame: {
00:15:36           functionName: 'emit',
00:15:36           scriptId: '11',
00:15:36           url: 'events.js',
00:15:36           lineNumber: 144,
00:15:36           columnNumber: 43
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 39 ]
00:15:36       },
00:15:36       {
00:15:36         id: 39,
00:15:36         callFrame: {
00:15:36           functionName: '',
00:15:36           scriptId: '52',
00:15:36           url: 'internal/main/worker_thread.js',
00:15:36           lineNumber: 89,
00:15:36           columnNumber: 19
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 40 ]
00:15:36       },
00:15:36       {
00:15:36         id: 40,
00:15:36         callFrame: {
00:15:36           functionName: 'Module.runMain',
00:15:36           scriptId: '61',
00:15:36           url: 'internal/modules/cjs/loader.js',
00:15:36           lineNumber: 807,
00:15:36           columnNumber: 25
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 41 ]
00:15:36       },
00:15:36       {
00:15:36         id: 41,
00:15:36         callFrame: {
00:15:36           functionName: 'Module._load',
00:15:36           scriptId: '61',
00:15:36           url: 'internal/modules/cjs/loader.js',
00:15:36           lineNumber: 506,
00:15:36           columnNumber: 23
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 42 ]
00:15:36       },
00:15:36       {
00:15:36         id: 42,
00:15:36         callFrame: {
00:15:36           functionName: 'Module.load',
00:15:36           scriptId: '61',
00:15:36           url: 'internal/modules/cjs/loader.js',
00:15:36           lineNumber: 619,
00:15:36           columnNumber: 32
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 43 ]
00:15:36       },
00:15:36       {
00:15:36         id: 43,
00:15:36         callFrame: {
00:15:36           functionName: 'Module._extensions..js',
00:15:36           scriptId: '61',
00:15:36           url: 'internal/modules/cjs/loader.js',
00:15:36           lineNumber: 767,
00:15:36           columnNumber: 36
00:15:36         },
00:15:36         hitCount: 0,
00:15:36         children: [ 44 ]
00:15:36       },
00:15:36       {
00:15:36         id: 44,
00:15:36         callFrame: {
00:15:36           functionName: 'readFileSync',
00:15:36           scriptId: '64',
00:15:36           url: 'fs.js',
00:15:36           lineNumber: 332,
00:15:36           columnNumber: 21
00:15:36         },
00:15:36         hitCount: 3,
00:15:36         children: [ 45 ],
00:15:36         positionTicks: [ [Object], [Object], [Object] ]
00:15:36       },
00:15:36       {
00:15:36         id: 45,
00:15:36         callFrame: {
00:15:36           functionName: 'tryReadSync',
00:15:36           scriptId: '64',
00:15:36           url: 'fs.js',
00:15:36           lineNumber: 320,
00:15:36           columnNumber: 20
00:15:36         },
00:15:36         hitCount: 1,
00:15:36         positionTicks: [ [Object] ]
00:15:36       }
00:15:36     ]
00:15:36     assert.js:362
00:15:36         throw err;
00:15:36         ^
00:15:36     
00:15:36     AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:
00:15:36     
00:15:36       assert(profile1.frames.length > 0 || profile2.frames.length > 0)
00:15:36     
00:15:36         at Object.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/sequential/test-cpu-prof.js:366:3)
00:15:36         at Module._compile (internal/modules/cjs/loader.js:759:30)
00:15:36         at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
00:15:36         at Module.load (internal/modules/cjs/loader.js:628:32)
00:15:36         at Function.Module._load (internal/modules/cjs/loader.js:555:12)
00:15:36         at Function.Module.runMain (internal/modules/cjs/loader.js:822:10)
00:15:36         at internal/main/run_main_module.js:17:11
00:15:36   ...
```

</details>

@joyeecheung