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investigate unreliable test-heapdump-http2 #34389

Description

@Trott

test/pummel/test-heapdump-http2.js is failing when I run it in CI and locally. (It passes the nightly CI on a particular Linux machine, but fails on many other machines when I run it more broadly in CI.)

The error always looks like this:

AssertionError [ERR_ASSERTION]: Expect to find 1 'Node / StreamPipe', found 0
    at State.validateSnapshot (/Users/trott/io.js/test/common/heap.js:122:14)
    at State.validateSnapshotNodes (/Users/trott/io.js/test/common/heap.js:186:10)
    at ClientHttp2Stream.<anonymous> (/Users/trott/io.js/test/pummel/test-heapdump-http2.js:60:11)
    at ClientHttp2Stream.<anonymous> (/Users/trott/io.js/test/common/index.js:365:15)
    at ClientHttp2Stream.emit (events.js:314:20)
    at emit (internal/http2/core.js:299:8)
    at processTicksAndRejections (internal/process/task_queues.js:83:22) {
  generatedMessage: false,
  code: 'ERR_ASSERTION',
  actual: 0,
  expected: 1,
  operator: 'strictEqual'
}

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    flaky-testIssues and PRs involving tests that fail intermittently in CI.http2Issues and PRs related to the http2 subsystem.

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