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Investigate flaky pummel/test-heapdump-worker #26712

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@Trott

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@Trott

https://ci.nodejs.org/job/node-test-commit-custom-suites-freestyle/5409/console

test-rackspace-ubuntu1604-x64-1

00:05:38 not ok 76 pummel/test-heapdump-worker
00:05:38   ---
00:05:38   duration_ms: 2.617
00:05:38   severity: fail
00:05:38   exitcode: 1
00:05:38   stack: |-
00:05:38     /home/iojs/build/workspace/node-test-commit-custom-suites-freestyle/test/common/heap.js:67
00:05:38                 throw new Error(
00:05:38                 ^
00:05:38     
00:05:38     Error: expected to find child { node_name: 'Node / AsyncRequest',
00:05:38       edge_name: 'thread_stopper_' } in [ { type: 'native',
00:05:38         name: 'Node / Worker',
00:05:38         id: 148476736,
00:05:38         self_size: 264,
00:05:38         edge_count: 3,
00:05:38         trace_node_id: 0,
00:05:38         incomingEdges:
00:05:38          [ { type: 'element',
00:05:38              to: [Circular],
00:05:38              from:
00:05:38               { type: 'synthetic',
00:05:38                 name: '',
00:05:38                 id: 1,
00:05:38                 self_size: 0,
00:05:38                 edge_count: 6,
00:05:38                 trace_node_id: 0,
00:05:38                 incomingEdges: [],
00:05:38                 outgoingEdges: [Array] },
00:05:38              name: null },
00:05:38            { type: 'internal',
00:05:38              to: [Circular],
00:05:38              from:
00:05:38               { type: 'object',
00:05:38                 name: 'Worker',
00:05:38                 id: 60087,
00:05:38                 self_size: 32,
00:05:38                 edge_count: 6,
00:05:38                 trace_node_id: 0,
00:05:38                 incomingEdges: [Array],
00:05:38                 outgoingEdges: [Array] },
00:05:38              name: 'wrapper' } ],
00:05:38         outgoingEdges:
00:05:38          [ { type: 'internal',
00:05:38              to:
00:05:38               { type: 'object',
00:05:38                 name: 'Worker',
00:05:38                 id: 60087,
00:05:38                 self_size: 32,
00:05:38                 edge_count: 6,
00:05:38                 trace_node_id: 0,
00:05:38                 incomingEdges: [Array],
00:05:38                 outgoingEdges: [Array] },
00:05:38              from: [Circular],
00:05:38              name: 'wrapped' },
00:05:38            { type: 'internal',
00:05:38              to:
00:05:38               { type: 'native',
00:05:38                 name: 'Node / MessagePort',
00:05:38                 id: 158403648,
00:05:38                 self_size: 216,
00:05:38                 edge_count: 2,
00:05:38                 trace_node_id: 0,
00:05:38                 incomingEdges: [Array],
00:05:38                 outgoingEdges: [Array] },
00:05:38              from: [Circular],
00:05:38              name: 'parent_port' },
00:05:38            { type: 'internal',
00:05:38              to:
00:05:38               { type: 'native',
00:05:38                 name: 'Node / AsyncRequest',
00:05:38                 id: 158402304,
00:05:38                 self_size: 72,
00:05:38                 edge_count: 1,
00:05:38                 trace_node_id: 0,
00:05:38                 incomingEdges: [Array],
00:05:38                 outgoingEdges: [Array] },
00:05:38              from: [Circular],
00:05:38              name: 'on_thread_finished_' } ] } ]
00:05:38         at State.validateSnapshot (/home/iojs/build/workspace/node-test-commit-custom-suites-freestyle/test/common/heap.js:67:19)
00:05:38         at State.validateSnapshotNodes (/home/iojs/build/workspace/node-test-commit-custom-suites-freestyle/test/common/heap.js:113:10)
00:05:38         at validateSnapshotNodes (/home/iojs/build/workspace/node-test-commit-custom-suites-freestyle/test/common/heap.js:123:24)
00:05:38         at Object.<anonymous> (/home/iojs/build/workspace/node-test-commit-custom-suites-freestyle/test/pummel/test-heapdump-worker.js:9:1)
00:05:38         at Module._compile (internal/modules/cjs/loader.js:813:30)
00:05:38         at Object.Module._extensions..js (internal/modules/cjs/loader.js:824:10)
00:05:38         at Module.load (internal/modules/cjs/loader.js:680:32)
00:05:38         at tryModuleLoad (internal/modules/cjs/loader.js:612:12)
00:05:38         at Function.Module._load (internal/modules/cjs/loader.js:604:3)
00:05:38         at Function.Module.runMain (internal/modules/cjs/loader.js:876:12)
00:05:38   ...

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