diff --git a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPart.java b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPart.java
index eb22ad5f71d..37127a5ea1c 100644
--- a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPart.java
+++ b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPart.java
@@ -32,7 +32,6 @@ import java.util.Queue;
 import java.util.concurrent.ThreadLocalRandom;
 
 import org.eclipse.jetty.io.Content;
-import org.eclipse.jetty.io.Retainable;
 import org.eclipse.jetty.io.content.ByteBufferContentSource;
 import org.eclipse.jetty.io.content.ChunksContentSource;
 import org.eclipse.jetty.io.content.PathContentSource;
@@ -119,7 +118,7 @@ public class MultiPart
      * <p>A part has an optional name, an optional fileName,
      * optional headers and an optional content.</p>
      */
-    public abstract static class Part
+    public abstract static class Part implements Closeable
     {
         private static final Throwable SENTINEL_CLOSE_EXCEPTION = new StaticException("Closed");
 
@@ -204,6 +203,7 @@ public class MultiPart
          * <a href="https://datatracker.ietf.org/doc/html/rfc7578#section-4.6">RFC 7578, section 4.6</a>.</p>
          *
          * @return the content of this part as a new {@link Content.Source}
+         * @see #getContentSource()
          */
         public abstract Content.Source newContentSource();
 
@@ -279,6 +279,7 @@ public class MultiPart
                 Files.delete(this.path);
         }
 
+        @Override
         public void close()
         {
             fail(SENTINEL_CLOSE_EXCEPTION);
@@ -354,15 +355,18 @@ public class MultiPart
         @Override
         public Content.Source newContentSource()
         {
-            return new ChunksContentSource(content.stream().map(c ->
-                Content.Chunk.asChunk(c.getByteBuffer().slice(), c.isLast(), Retainable.NOOP)).toList());
+            List<Content.Chunk> newChunks = content.stream()
+                .map(chunk -> Content.Chunk.asChunk(chunk.getByteBuffer().slice(), chunk.isLast(), chunk))
+                .peek(Content.Chunk::retain)
+                .toList();
+            return new ChunksContentSource(newChunks);
         }
 
         @Override
         public void close()
         {
             super.close();
-            content.forEach(Retainable::release);
+            content.forEach(Content.Chunk::release);
         }
 
         @Override
diff --git a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartByteRanges.java b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartByteRanges.java
index 3c0d7153d91..ed4fd95123a 100644
--- a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartByteRanges.java
+++ b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartByteRanges.java
@@ -24,8 +24,6 @@ import java.util.concurrent.CompletableFuture;
 
 import org.eclipse.jetty.io.Content;
 import org.eclipse.jetty.util.thread.AutoLock;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * <p>A {@link CompletableFuture} that is completed when a multipart/byteranges
@@ -56,8 +54,6 @@ import org.slf4j.LoggerFactory;
  */
 public class MultiPartByteRanges extends CompletableFuture<MultiPartByteRanges.Parts>
 {
-    private static final Logger LOG = LoggerFactory.getLogger(MultiPartByteRanges.class);
-
     private final PartsListener listener = new PartsListener();
     private final MultiPart.Parser parser;
 
diff --git a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartFormData.java b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartFormData.java
index a9a713600ea..552f35c1e5c 100644
--- a/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartFormData.java
+++ b/jetty-core/jetty-http/src/main/java/org/eclipse/jetty/http/MultiPartFormData.java
@@ -386,7 +386,8 @@ public class MultiPartFormData extends CompletableFuture<MultiPartFormData.Parts
                 }
                 catch (Throwable e)
                 {
-                    LOG.warn("Errors deleting multipart tmp files", e);
+                    if (LOG.isDebugEnabled())
+                        LOG.debug("Could not close part {}", p, e);
                 }
             }
         }
@@ -565,7 +566,7 @@ public class MultiPartFormData extends CompletableFuture<MultiPartFormData.Parts
             }
             for (MultiPart.Part part : toFail)
             {
-                part.close();
+                part.fail(cause);
             }
             close();
             delete();
diff --git a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/Retainable.java b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/Retainable.java
index 1d99f5fce79..d8e7dcabff5 100644
--- a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/Retainable.java
+++ b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/Retainable.java
@@ -26,26 +26,6 @@ import java.util.concurrent.atomic.AtomicInteger;
  */
 public interface Retainable
 {
-    Retainable NOOP = new Retainable()
-    {
-        @Override
-        public boolean canRetain()
-        {
-            return true;
-        }
-
-        @Override
-        public void retain()
-        {
-        }
-
-        @Override
-        public boolean release()
-        {
-            return true;
-        }
-    };
-
     /**
      * <p>Returns whether this resource is referenced counted by calls to {@link #retain()}
      * and {@link #release()}.</p>
diff --git a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/HttpStream.java b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/HttpStream.java
index 0bea0d2a677..6946df400d3 100644
--- a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/HttpStream.java
+++ b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/HttpStream.java
@@ -110,10 +110,10 @@ public interface HttpStream extends Callback
     {
         long consumedRequestContentBytes = 0;
         long maxUnconsumedRequestContentBytes = httpConfig.getMaxUnconsumedRequestContentBytes();
-        while (consumedRequestContentBytes < maxUnconsumedRequestContentBytes)
+        while (maxUnconsumedRequestContentBytes < 0 || consumedRequestContentBytes < maxUnconsumedRequestContentBytes)
         {
             // We can always just read again here as EOF and Error content will be persistently returned.
-            Content.Chunk content = stream.read();
+            Chunk content = stream.read();
 
             // if we cannot read to EOF then fail the stream rather than wait for unconsumed content
             if (content == null)
@@ -124,7 +124,7 @@ public interface HttpStream extends Callback
             content.release();
 
             // if the input failed, then fail the stream for same reason
-            if (content instanceof Content.Chunk.Error error)
+            if (content instanceof Chunk.Error error)
                 return error.getCause();
 
             if (content.isLast())
diff --git a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/DelayedHandler.java b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/DelayedHandler.java
index 97770f7fd28..f56b909701f 100644
--- a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/DelayedHandler.java
+++ b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/DelayedHandler.java
@@ -291,7 +291,7 @@ public class DelayedHandler extends Handler.Wrapper
             {
                 // We must execute here as even though we have consumed all the input, we are probably
                 // invoked in a demand runnable that is serialized with any write callbacks that might be done in process
-                getRequest().getContext().execute(super::process);
+                getRequest().getContext().execute(this::process);
             }
             else
             {