Sometimes the warnings plugin crashes when the job is running on an slave (created using Swarm). I can't find a reason and seems to be random at this stage.

ERROR: Publisher hudson.plugins.warnings.WarningsPublisher aborted due to exception
hudson.util.IOException2: remote file operation failed: /opt/jenkins-slave/workspace/retail-products-build at hudson.remoting.Channel@323ec485:ci-node-02.company.inet
at hudson.FilePath.act(FilePath.java:908)
at hudson.FilePath.act(FilePath.java:885)
at hudson.plugins.warnings.WarningsPublisher.annotate(WarningsPublisher.java:461)
at hudson.plugins.warnings.WarningsPublisher.parseConsoleLog(WarningsPublisher.java:407)
at hudson.plugins.warnings.WarningsPublisher.perform(WarningsPublisher.java:322)
at hudson.plugins.analysis.core.HealthAwareRecorder.perform(HealthAwareRecorder.java:333)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:781)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:753)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:706)
at hudson.model.Run.execute(Run.java:1690)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)
Caused by: java.io.IOException: Remote call on ci-node-02.company.inet failed
at hudson.remoting.Channel.call(Channel.java:723)
at hudson.FilePath.act(FilePath.java:901)
... 14 more
Caused by: java.lang.Error: Failed to deserialize the Callable object.
at hudson.remoting.UserRequest.perform(UserRequest.java:104)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at hudson.remoting.Engine$1$1.run(Engine.java:60)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassCastException: cannot assign instance of hudson.plugins.analysis.util.TreeString to field hudson.plugins.analysis.util.model.AbstractAnnotation.fileName of type hudson.plugins.analysis.util.TreeString in instance of hudson.plugins.warnings.parser.Warning
at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2063)
at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1241)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at java.util.HashSet.readObject(HashSet.java:308)
at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
at hudson.remoting.UserRequest.perform(UserRequest.java:98)
... 9 more

OS: CentOS 6.4 (master and slaves)
Jenkins version: 1.537
Warnings version: 4.40
Parser attached as screenshot.

After this, every build is failing when the Warnings plugins tries to scan the log, and I need to restart the service jenkins-slave running on the slave. After the restart everything starts to work again.