Don't reset the client when processCommand returns REDIS_ERR

src/networking.c

@@ -820,9 +820,13 @@ void processInputBuffer(redisClient *c) {
         }
 
         /* Multibulk processing could see a <= 0 length. */
-        if (c->argc > 0)
-            processCommand(c);
-        resetClient(c);
+        if (c->argc == 0) {
+            resetClient(c);
+        } else {
+            /* Only reset the client when the command was executed. */
+            if (processCommand(c) == REDIS_OK)
+                resetClient(c);
+        }
     }
 }
 

src/redis.c

@@ -955,7 +955,7 @@ int processCommand(redisClient *c) {
         addReply(c,shared.queued);
     } else {
         if (server.vm_enabled && server.vm_max_threads > 0 &&
-            blockClientOnSwappedKeys(c,cmd)) return 1;
+            blockClientOnSwappedKeys(c,cmd)) return REDIS_ERR;
         call(c,cmd);
     }
     return REDIS_OK;