When I got upgrade for robot plugin from R1.6.5 to R2.1.1,  I got some failed after robot running :
Robot results publisher started...
-Parsing output xml:
Failed!
java.io.IOException: Parsing of output xml failed!
at hudson.plugins.robot.RobotParser$RobotParserCallable.invoke(RobotParser.java:104)
at hudson.plugins.robot.RobotParser$RobotParserCallable.invoke(RobotParser.java:54)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3069)
at hudson.remoting.UserRequest.perform(UserRequest.java:211)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to 135.252.244.121
at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1788)
at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356)
at hudson.remoting.Channel.call(Channel.java:998)
at hudson.FilePath.act(FilePath.java:1069)
at hudson.FilePath.act(FilePath.java:1058)
at hudson.plugins.robot.RobotParser.parse(RobotParser.java:49)
at hudson.plugins.robot.RobotPublisher.parse(RobotPublisher.java:221)
at hudson.plugins.robot.RobotPublisher.perform(RobotPublisher.java:243)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1881)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
Caused by: javax.xml.stream.XMLStreamException: Could not find elements [arg] (at line: 3321 column: 1)
at hudson.plugins.robot.RobotParser$RobotParserCallable.xmlException(RobotParser.java:179)
at hudson.plugins.robot.RobotParser$RobotParserCallable.ignoreUntilStarts(RobotParser.java:217)
at hudson.plugins.robot.RobotParser$RobotParserCallable.processTest(RobotParser.java:299)
at hudson.plugins.robot.RobotParser$RobotParserCallable.processSuite(RobotParser.java:155)
at hudson.plugins.robot.RobotParser$RobotParserCallable.processSuite(RobotParser.java:153)
at hudson.plugins.robot.RobotParser$RobotParserCallable.processSuite(RobotParser.java:153)
at hudson.plugins.robot.RobotParser$RobotParserCallable.processSuite(RobotParser.java:153)
at hudson.plugins.robot.RobotParser$RobotParserCallable.parseResult(RobotParser.java:123)
at hudson.plugins.robot.RobotParser$RobotParserCallable.invoke(RobotParser.java:99)
... 10 more
Build step 'Publish Robot Framework test results' changed build result to FAILURE
Finished: FAILURE
 
Page generated: 2020-5-20 上午11时33分15秒REST API[Jenkins ver. 2.222.3|https://jenkins.io/]
 

same robot framwork and xml are working under R1.6.5, I see update information in 2.x.x:

Robot Framework Plugin 2.0.1 disables external entity resolution for its XML parser

I don't know whether the rootcause is came form XXE upgrading or not

-----Updating------

All of failuer are came from x86 system  (CentOS 32  2.6.32-431.el6.i686 and 32bit Robot)

In x64 system , it's OK