[JENKINS-57805] Guard against exceptions thrown by implementations of Queue.Task.getAffinityKey

core/src/main/java/hudson/model/LoadBalancer.java

@@ -112,7 +112,14 @@ public abstract class LoadBalancer implements ExtensionPoint {
         private boolean assignGreedily(Mapping m, Task task, List<ConsistentHash<ExecutorChunk>> hashes, int i) {
             if (i==hashes.size())   return true;    // fully assigned
 
-            String key = task.getAffinityKey() + (i>0 ? String.valueOf(i) : "");
+            String key;
+            try {
+                key = task.getAffinityKey();
+            } catch (RuntimeException e) {
+                // Default implementation of Queue.Task.getAffinityKey, we assume it doesn't fail.
+                key = task.getFullDisplayName();
+            }
+            key += i > 0 ? String.valueOf(i) : "";
 
             for (ExecutorChunk ec : hashes.get(i).list(key)) {
                 // let's attempt this assignment