Sling installer can duplicate factory configurations if an invalid RegisteredResourceList.ser is found

mvn clean package
java -jar target/org.apache.sling.launchpad-9-SNAPSHOT.jar
# wait for Sling to start up properly, stop it with CTRL-C
truncate --size=-1 sling/installer/RegisteredResourceList.ser
java -jar target/org.apache.sling.launchpad-9-SNAPSHOT.jar
# wait for Sling to start up properly, stop it with CTRL-C
java -jar target/org.apache.sling.launchpad-9-SNAPSHOT.jar

21.11.2016 14:32:26.538 *ERROR* [CM Configuration Updater (ManagedServiceFactory Update: factoryPid=[org.apache.sling.commons.log.LogManager.factory.config])] org.apache.felix.configadmin Service [org.apache.felix.cm.ConfigurationAdmin,28, [org.osgi.service.cm.ConfigurationAdmin]] [org.osgi.service.cm.ManagedServiceFactory, id=19, bundle=8/slinginstall:org.apache.sling.commons.log-5.0.1-SNAPSHOT.jar]: Updating property org.apache.sling.commons.log.names of configuration org.apache.sling.commons.log.LogManager.factory.config.b4cf7982-9af0-40a1-b720-3e83a9f9e7f9 caused a problem: Category log.request already defined by configuration org.apache.sling.commons.log.LogManager.factory.config.b4cf7982-9af0-40a1-b720-3e83a9f9e7f9 (org.osgi.service.cm.ConfigurationException: org.apache.sling.commons.log.names : Category log.request already defined by configuration org.apache.sling.commons.log.LogManager.factory.config.b4cf7982-9af0-40a1-b720-3e83a9f9e7f9)
org.osgi.service.cm.ConfigurationException: org.apache.sling.commons.log.names : Category log.request already defined by configuration org.apache.sling.commons.log.LogManager.factory.config.b4cf7982-9af0-40a1-b720-3e83a9f9e7f9
	at org.apache.sling.commons.log.logback.internal.config.LoggerManagedServiceFactory.updated(LoggerManagedServiceFactory.java:36)
	at org.apache.felix.cm.impl.helper.ManagedServiceFactoryTracker.updated(ManagedServiceFactoryTracker.java:159)
	at org.apache.felix.cm.impl.helper.ManagedServiceFactoryTracker.provideConfiguration(ManagedServiceFactoryTracker.java:93)
	at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceFactoryUpdate.provide(ConfigurationManager.java:1611)
	at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceFactoryUpdate.run(ConfigurationManager.java:1554)
	at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:141)
	at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:109)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.sling.commons.log.logback.internal.config.ConfigurationException: 
	at org.apache.sling.commons.log.logback.internal.LogConfigManager.updateLoggerConfiguration(LogConfigManager.java:533)
	at org.apache.sling.commons.log.logback.internal.config.LoggerManagedServiceFactory.updated(LoggerManagedServiceFactory.java:34)
	... 7 common frames omitted