Internal error when running test

[hutch31]

What is the current behavior?

When running a newly created test, I receive an internal error from firrtl generation

What is the expected behavior?

Generation should complete correctly as per other tests

Steps to Reproduce

Check out public chisel-packetlib repository at firrtl-bug-report tag:
https://github.com/hutch31/chisel-packetlib/tree/firrtl-bug-report

Run test "should work with multiple pools"

Reported Error

Internal Error! Please file an issue at https://github.com/ucb-bar/firrtl/issues
firrtl.FirrtlInternalException: Internal Error! Please file an issue at https://github.com/ucb-bar/firrtl/issues
at firrtl.Utils$.error(Utils.scala:472)
at firrtl.Utils$.throwInternalError(Utils.scala:163)
at firrtl.stage.phases.CatchExceptions.transform(CatchExceptions.scala:38)
at firrtl.stage.phases.CatchExceptions.transform(CatchExceptions.scala:17)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:38)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15)
at firrtl.options.Translator.transform(Phase.scala:248)
at firrtl.options.Translator.transform$(Phase.scala:248)
at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15)
at firrtl.options.DependencyManager.$anonfun$transform$3(DependencyManager.scala:278)
at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
at scala.collection.immutable.List.foldLeft(List.scala:89)
at firrtl.options.DependencyManager.transform(DependencyManager.scala:269)
at firrtl.options.DependencyManager.transform$(DependencyManager.scala:255)
at firrtl.options.PhaseManager.transform(DependencyManager.scala:436)
at firrtl.stage.FirrtlStage.run(FirrtlStage.scala:38)
at firrtl.options.Stage$$anon$1.transform(Stage.scala:43)
at firrtl.options.Stage$$anon$1.transform(Stage.scala:43)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:38)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15)
at firrtl.options.Translator.transform(Phase.scala:248)
at firrtl.options.Translator.transform$(Phase.scala:248)
at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15)
at firrtl.options.Stage.$anonfun$transform$5(Stage.scala:47)
at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
at scala.collection.immutable.List.foldLeft(List.scala:89)
at firrtl.options.Stage.$anonfun$transform$3(Stage.scala:47)
at logger.Logger$.$anonfun$makeScope$2(Logger.scala:166)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
at logger.Logger$.makeScope(Logger.scala:164)
at firrtl.options.Stage.transform(Stage.scala:47)
at chisel3.stage.phases.MaybeFirrtlStage.$anonfun$transform$2(MaybeFirrtlStage.scala:22)
at scala.Option.getOrElse(Option.scala:189)
at chisel3.stage.phases.MaybeFirrtlStage.transform(MaybeFirrtlStage.scala:22)
at chisel3.stage.phases.MaybeFirrtlStage.transform(MaybeFirrtlStage.scala:13)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:38)
at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15)
at firrtl.options.Translator.transform(Phase.scala:248)
at firrtl.options.Translator.transform$(Phase.scala:248)
at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15)
at firrtl.options.DependencyManager.$anonfun$transform$3(DependencyManager.scala:278)
at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
at scala.collection.immutable.List.foldLeft(List.scala:89)
at firrtl.options.DependencyManager.transform(DependencyManager.scala:269)
at firrtl.options.DependencyManager.transform$(DependencyManager.scala:255)
at firrtl.options.PhaseManager.transform(DependencyManager.scala:436)
at chisel3.stage.ChiselStage.run(ChiselStage.scala:46)

Your environment

• Chisel Verions: 3.4.2
• OS: Windows 11, Amazon Corretto Java 1.8.0_312
• Verilator version: n/a

[hutch31]

The test in question fails because the numPools parameter is set to 2, which is the only value for which the test fails. While numPools == 1 is special cased and generates different code, the code path is identical for numPools >= 2. I tested from values 3 up to 8 and all compile and simulate correctly, so I cannot identify any particular code path which causes this to fail.