Fix due to netty/netty#15922

Author: franz1981

core/src/main/java/io/netty/loom/EventLoopScheduler.java

@@ -83,7 +83,12 @@ public EventLoopScheduler(IoEventLoopGroup parent, ThreadFactory threadFactory,
 		eventLoopThread = vThreadFactory
 				.newThread(() -> FastThreadLocalThread.runWithFastThreadLocal(this::nettyEventLoop));
 		ioEventLoop = new ManualIoEventLoop(parent, eventLoopThread,
-				ioExecutor -> new AwakeAwareIoHandler(eventLoopIsRunning, ioHandlerFactory.newHandler(ioExecutor)));
+				ioExecutor -> new AwakeAwareIoHandler(eventLoopIsRunning, ioHandlerFactory.newHandler(ioExecutor))) {
+			@Override
+			public boolean canBlock() {
+				return runQueue.isEmpty();
+			}
+		};
 		carrierThread.start();
 	}
 

core/src/test/java/io/netty/loom/VirtualMultithreadIoEventLoopGroupTest.java

@@ -21,6 +21,7 @@
 import java.util.stream.Stream;
 
 import io.netty.channel.*;
+import io.netty.channel.epoll.Epoll;
 import io.netty.channel.local.LocalIoHandler;
 import io.netty.channel.epoll.EpollIoHandler;
 import io.netty.channel.epoll.EpollServerSocketChannel;
@@ -63,8 +64,7 @@ boolean isLocal() {
 		boolean isAvailable() {
 			return switch (this) {
 				case NIO -> true;
-				// TODO disable EPOLL due to https://github.com/netty/netty/issues/15922
-				case EPOLL -> false;
+				case EPOLL -> Epoll.isAvailable();
 				case IO_URING -> IoUring.isAvailable();
 				case LOCAL -> true;
 				default -> false;