PekkoHttpServerInstrumentationAsyncHttp2Test."test exception" is flaky

Start with PekkoHttpServerInstrumentationAsyncHttp2Test and the failing test at HttpServerTest.groovy:1204; run it on the listed Java versions and inspect the trace assertion and ListWriter timeout. Done means the test passes reliably in GitLab CI and still validates the expected exception trace.

Tracer Version(s)

1.52.1

Java Version(s)

8, 17, 21

JVM Vendor

Oracle JDK

Bug Report

Failed more than 200 times on GitLab CI on all versions of java and libs (no clear pattern).

PekkoHttpServerInstrumentationAsyncHttp2Test > test exception FAILED
org.spockframework.runtime.ConditionFailedWithExceptionError at HttpServerTest.groovy:1204
Caused by: java.util.concurrent.TimeoutException at ListWriter.java:95

And

Condition failed with Exception:

assertTraces(1) { trace(spanCount(EXCEPTION)) { sortSpansByStart() serverSpan(it, null, null, method, EXCEPTION) if (hasHandlerSpan()) { handlerSpan(it, EXCEPTION) } controllerSpan(it, EXCEPTION) if (hasResponseSpan(EXCEPTION)) { responseSpan(it, EXCEPTION) } trailingSpans(it, EXCEPTION) } }

Condition failed with Exception:

assertTraces(1) { trace(spanCount(EXCEPTION)) { sortSpansByStart() serverSpan(it, null, null, method, EXCEPTION) if (hasHandlerSpan()) { handlerSpan(it, EXCEPTION) } controllerSpan(it, EXCEPTION) if (hasResponseSpan(EXCEPTION)) { responseSpan(it, EXCEPTION) } trailingSpans(it, EXCEPTION) } }

	at datadog.trace.agent.test.base.HttpServerTest.test exception(HttpServerTest.groovy:1204)
Caused by: java.util.concurrent.TimeoutException: Timeout waiting for 1 trace(s). ListWriter.size() == 0 : []
	at datadog.trace.common.writer.ListWriter.waitForTraces(ListWriter.java:95)
	at datadog.trace.agent.test.asserts.ListWriterAssert.assertTraces(ListWriterAssert.groovy:50)
	at datadog.trace.agent.test.asserts.ListWriterAssert.assertTraces(ListWriterAssert.groovy:41)
	at datadog.trace.agent.test.AgentTestRunner.assertTraces(AgentTestRunner.groovy:701)
	at datadog.trace.agent.test.AgentTestRunner.assertTraces(AgentTestRunner.groovy:690)
	... 1 more

Expected Behavior

Test should pass

Reproduction Code

No response