investigate flaky test-cpu-prof

[Trott]

https://ci.nodejs.org/job/node-test-commit-freebsd/26122/nodes=freebsd11-x64/console

test-digitalocean-freebsd11-x64-2

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       },
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         },
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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,
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00:15:36         },
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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         },
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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,
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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',
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00:15:36         },
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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         },
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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   ...

@joyeecheung

[joyeecheung]

I think this is caused by the function finishing too fast before it gets sampled in the profile. I have a rewritten version of the test here which may be more stable than the current one, though it runs longer (the current one takes < 1 sec on my laptop while the new one takes about 3 sec), because it intentionally keeps the function being profiled running for much longer than the sampling interval (1000x) to make sure it shows up in the profile.

I will see if https://ci.nodejs.org/job/node-test-commit/28455/ works before opening a PR.

[joyeecheung]

Although, on the other hand, another approach would be to not looking for a specific function in the profile at all but instead only make sure the profile exits and can be parsed. But this is kind of like the tick processor test - we want to make sure the generated profile actually can be analyzed by users and the functionality don't get broken randomly by V8.

[joyeecheung]

From https://ci.nodejs.org/job/node-test-commit/28459/ there is an alarming DCHECK:

See failures on test-digitalocean-ubuntu1604_sharedlibs_container-x64-7:

not ok 436 parallel/test-cpu-prof
  ---
  duration_ms: 1.978
  severity: fail
  exitcode: 1
  stack: |-
    Dispatching message { "id": 1, "method": "Profiler.enable" }
    Receive CPU profile message, ending = false
    Dispatching message { "id": 2, "method": "Profiler.start" }
    Receive CPU profile message, ending = false
    Dispatching message { "id": 3, "method": "Profiler.setSamplingInterval", "params": { "interval": 1000 } }
    Receive CPU profile message, ending = false
    
    
    #
    # Fatal error in ../deps/v8/src/profiler/profile-generator.cc, line 24
    # Debug check failed: line > 0 (0 vs. 0).
    #
    #
    #
    #FailureMessage Object: 0x7ffc07a223e0
    assert.js:89
      throw new AssertionError(obj);
      ^
    
    AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
    
    null !== 0
    
        at Object.<anonymous> (/home/iojs/build/workspace/node-test-commit-linux-containered/test/parallel/test-cpu-prof.js:78:10)
        at Module._compile (internal/modules/cjs/loader.js:759:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
        at Module.load (internal/modules/cjs/loader.js:628:32)
        at Function.Module._load (internal/modules/cjs/loader.js:555:12)
        at Function.Module.runMain (internal/modules/cjs/loader.js:822:10)
        at internal/main/run_main_module.js:17:11
  ...

And from a glance I think test failures in release builds all have frames where lineNumber = -1 so it might be an upstream bug.

EDIT: it looks like the -1s are just for synthetic nodes which makes sense..

[Trott]

https://ci.nodejs.org/job/node-test-commit-linux-containered/13322/nodes=ubuntu1604_sharedlibs_debug_x64/console

10:18:23 not ok 2340 sequential/test-cpu-prof
10:18:23   ---
10:18:23   duration_ms: 480.79
10:18:23   severity: fail
10:18:23   exitcode: -15
10:18:23   stack: |-
10:18:23     timeout
10:18:23   ...

[Trott]

And again...I wondered if these particular failures are just because debug build is slow, but nope. On a successful run, this test takes 4 seconds or so on the debug build.

https://ci.nodejs.org/job/node-test-commit-linux-containered/13325/nodes=ubuntu1604_sharedlibs_debug_x64/console

10:57:29 not ok 2339 sequential/test-cpu-prof
10:57:29   ---
10:57:29   duration_ms: 480.70
10:57:29   severity: fail
10:57:29   exitcode: -15
10:57:29   stack: |-
10:57:29     timeout
10:57:29   ...

[Trott]

The test is failing consistently on debug builds in CI. Last success was about 36 hours ago.

/cc @joyeecheung @addaleax (based on git log...sorry if you're not the right folks to ping here)

[joyeecheung]

This takes 29 seconds to finish on a debug build for me locally..maybe we should split it into multiple tests instead.

[rvagg]

@Trott just a minor follow-up to your notes in IRC: all of the test-softlayer-ubuntu1604_sharedlibs_container-x64-? Jenkins nodes are all running on the same single host server, test-softlayer-ubuntu1604-docker-x64-1 (which you have access to if you're brave enough to try and debug locally). If it's true that you're only getting failures on test-softlayer-ubuntu1604_sharedlibs_container-x64-? machines and not the other sharedlibs machines then it could be a local problem. But, you mentioned test-softlayer-ubuntu1604_sharedlibs_container-x64-7 which isn't a thing, there's test-digitalocean-ubuntu1604_sharedlibs_container-x64-7 but that's on one of the two DigitalOcean hosts that run these containers (one has the even numbers and the other has the odd numbers). We also have one running on Joyent too so that may show up occasionally.
So, when looking for failure patterns with these container runs, pay attention to the provider name, in the case of SoftLayer and Joyent, they are all on the same base host. In the case of DO they span 2 hosts.

[joyeecheung]

I did a quick scan and it seems after #28170 the flake has only showed up on freebsd due to being unable to find the target function in the samples e.g. https://ci.nodejs.org/job/node-test-commit-freebsd/26826/nodes=freebsd11-x64/consoleFull