version 3.3.1 doesn't properly terminate on error in SBT

build.sbt

ThisBuild / scalaVersion := "2.13.7"
ThisBuild / organization := "org.example"

val commonSettings = Seq(
  version := "0.0.1",
  scalacOptions ++= Seq("-deprecation", "-Xfatal-warnings")
)

val root = (project in file("."))
  .settings(commonSettings)
  .settings(
    name := "ds",
    libraryDependencies += "org.typelevel" %% "cats-effect" % "3.3.1"
  )

Main.scala

object Main extends IOApp.Simple {

  def run: IO[Unit] =
    IO.raiseError(new RuntimeException)
}

% sbt
[info] welcome to sbt 1.5.5 (Oracle Corporation Java 13.0.1)
> run

Expected behavior: IOApp completes with error, sbt is usable Actual behavior: IOApp completes with error, sbt starts consuming all available CPU(up to 800% on my PC)

After I change ce3 version to 3.3.0 the problem disappears.

[vasilmkd]

CE3 3.3.2 crashes sbt 1.6.x completely using this IOApp.

[vasilmkd]

Sbt 1.6.0 is not actually killed, it just lacks the code to trap System.exit (i.e. it’s a feature, not a bug).