:reload gives xml persistence exception

start CLI on a fresh AS and do :reload and you'll get a

21:09:39,415 ERROR [org.jboss.as.controller] Failed to persist configuration change: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to marshal configuration
at org.jboss.as.controller.persistence.FilePersistenceResource.<init>(FilePersistenceResource.java:62) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.persistence.ConfigurationFilePersistenceResource.<init>(ConfigurationFilePersistenceResource.java:39) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.persistence.BackupXmlConfigurationPersister.store(BackupXmlConfigurationPersister.java:80) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.ModelControllerImpl.writeModel(ModelControllerImpl.java:282) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.doCompleteStep(OperationContextImpl.java:312) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.completeStep(OperationContextImpl.java:219) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.executeStep(OperationContextImpl.java:440) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.doCompleteStep(OperationContextImpl.java:285) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.completeStep(OperationContextImpl.java:219) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.operations.global.WriteAttributeHandlers$WriteAttributeOperationHandler.modelChanged(WriteAttributeHandlers.java:123) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.operations.global.WriteAttributeHandlers$WriteAttributeOperationHandler.execute(WriteAttributeHandlers.java:90) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.operations.global.GlobalOperationHandlers$WriteAttributeHandler.execute(GlobalOperationHandlers.java:487) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.executeStep(OperationContextImpl.java:386) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.doCompleteStep(OperationContextImpl.java:285) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.OperationContextImpl.completeStep(OperationContextImpl.java:219) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.ModelControllerImpl.boot(ModelControllerImpl.java:167) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:173) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.server.ServerService.boot(ServerService.java:208)
at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:168) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.server.ServerService.boot(ServerService.java:197)
at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:133) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_27]
Caused by: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to write configuration
at org.jboss.as.controller.persistence.AbstractConfigurationPersister.marshallAsXml(AbstractConfigurationPersister.java:109) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.persistence.FilePersistenceResource.<init>(FilePersistenceResource.java:55) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
... 21 more
Caused by: java.lang.IllegalArgumentException
at org.jboss.dmr.ModelValue.getKeys(ModelValue.java:124) [jboss-dmr-1.0.0.Final.jar:1.0.0.Final]
at org.jboss.dmr.ModelNode.keys(ModelNode.java:1085) [jboss-dmr-1.0.0.Final.jar:1.0.0.Final]
at org.jboss.as.controller.parsing.StandaloneXml.writeServerProfile(StandaloneXml.java:563) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.parsing.StandaloneXml.writeContent(StandaloneXml.java:499) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.as.controller.parsing.StandaloneXml.writeContent(StandaloneXml.java:82) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.staxmapper.XMLMapperImpl.doDeparse(XMLMapperImpl.java:78) [staxmapper-1.0.0.Final.jar:1.0.0.Final]
at org.jboss.staxmapper.XMLMapperImpl.deparseDocument(XMLMapperImpl.java:73) [staxmapper-1.0.0.Final.jar:1.0.0.Final]
at org.jboss.as.controller.persistence.AbstractConfigurationPersister.marshallAsXml(AbstractConfigurationPersister.java:103) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
... 22 more