From b58c0fb37faa8c71cacb72e0a9f73574f5de238b Mon Sep 17 00:00:00 2001
From: MkDev11 <jaysmth689@gmail.com>
Date: Wed, 14 Jan 2026 15:57:50 -0500
Subject: [PATCH] [2.x] fix: Cleanup child processes on sbt exit (#8532)

When using fork := true, sbt spawns child processes that may become
stale if cancelled. Previously, these processes were not cleaned up
when running the exit command.

This fix adds RunningProcesses.killAll() to the shutdown hook so that
all tracked forked processes are terminated when sbt exits.

Fixes #7468
---
 main/src/main/scala/sbt/Main.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/main/src/main/scala/sbt/Main.scala b/main/src/main/scala/sbt/Main.scala
index eca59bd5d..d30dc5895 100644
--- a/main/src/main/scala/sbt/Main.scala
+++ b/main/src/main/scala/sbt/Main.scala
@@ -29,7 +29,7 @@ import sbt.internal.server.{ BuildServerProtocol, NetworkChannel }
 import sbt.internal.util.Terminal.hasConsole
 import sbt.internal.util.Types.{ const, idFun }
 import sbt.internal.util.complete.Parser
-import sbt.internal.util.{ Terminal as ITerminal, * }
+import sbt.internal.util.{ RunningProcesses, Terminal as ITerminal, * }
 import sbt.io.*
 import sbt.io.syntax.*
 import sbt.util.{ Level, Logger, Show }
@@ -221,6 +221,7 @@ object StandardMain {
   })
 
   private val closeRunnable = () => {
+    RunningProcesses.killAll()
     exchange.shutdown()
     pool.foreach(_.shutdownNow())
   }