He-Pin opened a new issue, #2558: URL: https://github.com/apache/pekko/issues/2558
```scala 12-06 13:14:50.527] [info] - must complete when downstream cancels before pulling and upstream does not produce *** FAILED *** (4 seconds, 13 milliseconds) [12-06 13:14:50.527] [info] The future returned an exception of type: scala.concurrent.Future$$anon$3, with message: Future.failed not completed with a throwable.. (FlowFlatMapPrefixSpec.scala:678) [12-06 13:14:50.527] [info] org.scalatest.exceptions.TestFailedException: [12-06 13:14:50.527] [info] at org.scalatest.concurrent.ScalaFutures$$anon$1.futureValueImpl(ScalaFutures.scala:333) [12-06 13:14:50.527] [info] at org.scalatest.concurrent.Futures$FutureConcept.futureValue(Futures.scala:476) [12-06 13:14:50.527] [info] at org.scalatest.concurrent.Futures$FutureConcept.futureValue$(Futures.scala:259) [12-06 13:14:50.527] [info] at org.scalatest.concurrent.ScalaFutures$$anon$1.futureValue(ScalaFutures.scala:281) [12-06 13:14:50.527] [info] at org.apache.pekko.stream.scaladsl.FlowFlatMapPrefixSpec.f$proxy31$1(FlowFlatMapPrefixSpec.scala:678) [12-06 13:14:50.527] [info] at org.apache.pekko.stream.scaladsl.FlowFlatMapPrefixSpec.$init$$$anonfun$2$$anonfun$1$$anonfun$31(FlowFlatMapPrefixSpec.scala:680) [12-06 13:14:50.527] [info] at org.scalatest.Transformer.apply$$anonfun$1(Transformer.scala:22) [12-06 13:14:50.527] [info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85) [12-06 13:14:50.527] [info] at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:31) [12-06 13:14:50.527] [info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) [12-06 13:14:50.527] [info] at org.scalatest.Transformer.apply(Transformer.scala:22) [12-06 13:14:50.527] [info] at org.scalatest.Transformer.apply(Transformer.scala:21) [12-06 13:14:50.527] [info] at org.scalatest.wordspec.AnyWordSpecLike$$anon$3.apply(AnyWordSpecLike.scala:1118) [12-06 13:14:50.527] [info] at org.scalatest.TestSuite.withFixture(TestSuite.scala:196) [12-06 13:14:50.528] [info] at org.scalatest.TestSuite.withFixture$(TestSuite.scala:138) [12-06 13:14:50.528] [info] at org.apache.pekko.stream.testkit.StreamSpec.withFixture(StreamSpec.scala:50) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.invokeWithFixture$1(AnyWordSpecLike.scala:1124) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$$anonfun$1(AnyWordSpecLike.scala:1128) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest(AnyWordSpecLike.scala:1128) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$(AnyWordSpecLike.scala:44) [12-06 13:14:50.528] [info] at org.apache.pekko.testkit.PekkoSpec.runTest(PekkoSpec.scala:82) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$$anonfun$1(AnyWordSpecLike.scala:1187) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:413) [12-06 13:14:50.528] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) [12-06 13:14:50.528] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) [12-06 13:14:50.528] [info] at scala.collection.immutable.List.foreach(List.scala:334) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:390) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:427) [12-06 13:14:50.528] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) [12-06 13:14:50.528] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) [12-06 13:14:50.528] [info] at scala.collection.immutable.List.foreach(List.scala:334) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:396) [12-06 13:14:50.528] [info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:475) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests(AnyWordSpecLike.scala:1187) [12-06 13:14:50.528] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$(AnyWordSpecLike.scala:44) [12-06 13:14:50.528] [info] at org.apache.pekko.testkit.PekkoSpec.runTests(PekkoSpec.scala:82) [12-06 13:14:50.528] [info] at org.scalatest.Suite.run(Suite.scala:1114) [12-06 13:14:50.528] [info] at org.scalatest.Suite.run$(Suite.scala:564) [12-06 13:14:50.528] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$wordspec$AnyWordSpecLike$$super$run(PekkoSpec.scala:82) [12-06 13:14:50.529] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$$anonfun$1(AnyWordSpecLike.scala:1232) [12-06 13:14:50.529] [info] at org.scalatest.SuperEngine.runImpl(Engine.scala:535) [12-06 13:14:50.529] [info] at org.scalatest.wordspec.AnyWordSpecLike.run(AnyWordSpecLike.scala:1232) [12-06 13:14:50.529] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$(AnyWordSpecLike.scala:44) [12-06 13:14:50.529] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$BeforeAndAfterAll$$super$run(PekkoSpec.scala:82) [12-06 13:14:50.529] [info] at org.scalatest.BeforeAndAfterAll.liftedTree1$1(BeforeAndAfterAll.scala:213) [12-06 13:14:50.529] [info] at org.scalatest.BeforeAndAfterAll.run(BeforeAndAfterAll.scala:217) [12-06 13:14:50.529] [info] at org.scalatest.BeforeAndAfterAll.run$(BeforeAndAfterAll.scala:135) [12-06 13:14:50.529] [info] at org.apache.pekko.testkit.PekkoSpec.run(PekkoSpec.scala:82) [12-06 13:14:50.529] [info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:321) [12-06 13:14:50.529] [info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:517) [12-06 13:14:50.529] [info] at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414) [12-06 13:14:50.529] [info] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [12-06 13:14:50.529] [info] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [12-06 13:14:50.529] [info] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [12-06 13:14:50.529] [info] at java.base/java.lang.Thread.run(Thread.java:840) [12-06 13:14:50.529] [info] Cause: scala.concurrent.Future$$anon$3: Future.failed not completed with a throwable. [WARN] [12/06/2025 13:14:50.540] [FlowFlatMapPrefixSpec-pekko.actor.default-dispatcher-9] [pekko://FlowFlatMapPrefixSpec/user/StreamSupervisor*] received dead letter from Actor[pekko://FlowFlatMapPrefixSpec/system/testProbe-3679#-1331549449]: GetChildren [INFO] [pekkoDeadLetter][12/06/2025 13:14:50.540] [FlowFlatMapPrefixSpec-pekko.actor.default-dispatcher-6] [pekko://FlowFlatMapPrefixSpec/user/StreamSupervisor*] Message [org.apache.pekko.stream.impl.StreamSupervisor$GetChildren$] from Actor[pekko://FlowFlatMapPrefixSpec/system/testProbe-3679#-1331549449] to Actor[pekko://FlowFlatMapPrefixSpec/user/StreamSupervisor*] was not delivered. [2] dead letters encountered. If this is not an expected behavior then Actor[pekko://FlowFlatMapPrefixSpec/user/StreamSupervisor*] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'pekko.log-dead-letters' and 'pekko.log-dead-letters-during-shutdown'. --- Stream actors debug dump --- Stream is completed. No debug information is available [12-06 13:14:54.541] [info] - must complete when downstream cancels before pulling and upstream does not produce, prefix=0 *** FAILED *** (4 seconds, 12 milliseconds) [12-06 13:14:54.541] [info] The future returned an exception of type: scala.concurrent.Future$$anon$3, with message: Future.failed not completed with a throwable.. (FlowFlatMapPrefixSpec.scala:694) [12-06 13:14:54.541] [info] org.scalatest.exceptions.TestFailedException: [12-06 13:14:54.541] [info] at org.scalatest.concurrent.ScalaFutures$$anon$1.futureValueImpl(ScalaFutures.scala:333) [12-06 13:14:54.541] [info] at org.scalatest.concurrent.Futures$FutureConcept.futureValue(Futures.scala:476) [12-06 13:14:54.541] [info] at org.scalatest.concurrent.Futures$FutureConcept.futureValue$(Futures.scala:259) [12-06 13:14:54.541] [info] at org.scalatest.concurrent.ScalaFutures$$anon$1.futureValue(ScalaFutures.scala:281) [12-06 13:14:54.541] [info] at org.apache.pekko.stream.scaladsl.FlowFlatMapPrefixSpec.f$proxy32$1(FlowFlatMapPrefixSpec.scala:694) [12-06 13:14:54.541] [info] at org.apache.pekko.stream.scaladsl.FlowFlatMapPrefixSpec.$init$$$anonfun$2$$anonfun$1$$anonfun$32(FlowFlatMapPrefixSpec.scala:696) [12-06 13:14:54.541] [info] at org.scalatest.Transformer.apply$$anonfun$1(Transformer.scala:22) [12-06 13:14:54.541] [info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85) [12-06 13:14:54.541] [info] at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:31) [12-06 13:14:54.541] [info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) [12-06 13:14:54.541] [info] at org.scalatest.Transformer.apply(Transformer.scala:22) [12-06 13:14:54.541] [info] at org.scalatest.Transformer.apply(Transformer.scala:21) [12-06 13:14:54.541] [info] at org.scalatest.wordspec.AnyWordSpecLike$$anon$3.apply(AnyWordSpecLike.scala:1118) [12-06 13:14:54.542] [info] at org.scalatest.TestSuite.withFixture(TestSuite.scala:196) [12-06 13:14:54.542] [info] at org.scalatest.TestSuite.withFixture$(TestSuite.scala:138) [12-06 13:14:54.542] [info] at org.apache.pekko.stream.testkit.StreamSpec.withFixture(StreamSpec.scala:50) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.invokeWithFixture$1(AnyWordSpecLike.scala:1124) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$$anonfun$1(AnyWordSpecLike.scala:1128) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest(AnyWordSpecLike.scala:1128) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$(AnyWordSpecLike.scala:44) [12-06 13:14:54.542] [info] at org.apache.pekko.testkit.PekkoSpec.runTest(PekkoSpec.scala:82) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$$anonfun$1(AnyWordSpecLike.scala:1187) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:413) [12-06 13:14:54.542] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) [12-06 13:14:54.542] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) [12-06 13:14:54.542] [info] at scala.collection.immutable.List.foreach(List.scala:334) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:390) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:427) [12-06 13:14:54.542] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15) [12-06 13:14:54.542] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10) [12-06 13:14:54.542] [info] at scala.collection.immutable.List.foreach(List.scala:334) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:396) [12-06 13:14:54.542] [info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:475) [12-06 13:14:54.542] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests(AnyWordSpecLike.scala:1187) [12-06 13:14:54.543] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$(AnyWordSpecLike.scala:44) [12-06 13:14:54.543] [info] at org.apache.pekko.testkit.PekkoSpec.runTests(PekkoSpec.scala:82) [12-06 13:14:54.543] [info] at org.scalatest.Suite.run(Suite.scala:1114) [12-06 13:14:54.543] [info] at org.scalatest.Suite.run$(Suite.scala:564) [12-06 13:14:54.543] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$wordspec$AnyWordSpecLike$$super$run(PekkoSpec.scala:82) [12-06 13:14:54.543] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$$anonfun$1(AnyWordSpecLike.scala:1232) [12-06 13:14:54.543] [info] at org.scalatest.SuperEngine.runImpl(Engine.scala:535) [12-06 13:14:54.543] [info] at org.scalatest.wordspec.AnyWordSpecLike.run(AnyWordSpecLike.scala:1232) [12-06 13:14:54.543] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$(AnyWordSpecLike.scala:44) [12-06 13:14:54.543] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$BeforeAndAfterAll$$super$run(PekkoSpec.scala:82) [12-06 13:14:54.543] [info] at org.scalatest.BeforeAndAfterAll.liftedTree1$1(BeforeAndAfterAll.scala:213) [12-06 13:14:54.543] [info] at org.scalatest.BeforeAndAfterAll.run(BeforeAndAfterAll.scala:217) [12-06 13:14:54.543] [info] at org.scalatest.BeforeAndAfterAll.run$(BeforeAndAfterAll.scala:135) [12-06 13:14:54.543] [info] at org.apache.pekko.testkit.PekkoSpec.run(PekkoSpec.scala:82) [12-06 13:14:54.543] [info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:321) [12-06 13:14:54.543] [info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:517) [12-06 13:14:54.543] [info] at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414) [12-06 13:14:54.543] [info] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [12-06 13:14:54.543] [info] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [12-06 13:14:54.543] [info] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [12-06 13:14:54.543] [info] at java.base/java.lang.Thread.run(Thread.java:840) [12-06 13:14:54.543] [info] Cause: scala.concurrent.Future$$anon$3: Future.failed not completed with a throwable. ``` -- This is an automated message from the Apache Git Service. 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