Reliably unpause execution thread in case of late shutdown

Closes gh-37406

spring-context/src/main/java/org/springframework/scheduling/concurrent/ExecutorConfigurationSupport.java

@@ -366,6 +366,9 @@ public abstract class ExecutorConfigurationSupport extends CustomizableThreadFac
 			logger.debug("Shutting down ExecutorService" + (this.beanName != null ? " '" + this.beanName + "'" : ""));
 		}
 		if (this.executor != null) {
+			if (this.lifecycleDelegate != null && this.lateShutdown) {
+				this.lifecycleDelegate.markShutdown();
+			}
 			if (this.waitForTasksToCompleteOnShutdown) {
 				this.executor.shutdown();
 			}

spring-context/src/main/java/org/springframework/scheduling/concurrent/ExecutorLifecycleDelegate.java

@@ -104,7 +104,14 @@ final class ExecutorLifecycleDelegate implements SmartLifecycle {
 	}
 
 	void markShutdown() {
-		this.shutdown = true;
+		this.pauseLock.lock();
+		try {
+			this.shutdown = true;
+			this.unpaused.signalAll();
+		}
+		finally {
+			this.pauseLock.unlock();
+		}
 	}
 
 	void beforeExecute(Thread thread) {