If a step throws an AbortException, the intent is that this is displayed as a single-line error with no stack trace. Yet if this is inside a parallel step, it gets wrapped, twice, and the full stack trace printed to the log:
Running: End of Workflow
org.jenkinsci.plugins.workflow.cps.steps.ParallelStepException: Parallel step split3 failed
at org.jenkinsci.plugins.workflow.cps.steps.ParallelStep$ResultHandler$Callback.checkAllDone(ParallelStep.java:126)
at org.jenkinsci.plugins.workflow.cps.steps.ParallelStep$ResultHandler$Callback.onFailure(ParallelStep.java:105)
at org.jenkinsci.plugins.workflow.cps.CpsBodyExecution$FailureAdapter.receive(CpsBodyExecution.java:295)
at com.cloudbees.groovy.cps.impl.ThrowBlock$1.receive(ThrowBlock.java:68)
at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
at com.cloudbees.groovy.cps.Next.step(Next.java:58)
at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:145)
at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:164)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:262)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$000(CpsThreadGroup.java:70)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:174)
at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:172)
at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:47)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:111)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.UndeclaredThrowableException
at org.jenkinsci.plugins.workflow.cps.CpsStepContext.replay(CpsStepContext.java:409)
at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:164)
at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:98)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:15)
at WorkflowScript.run(WorkflowScript:15)
at Unknown.Unknown(Unknown)
at ___cps.transform___(Native Method)
at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:69)
at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:100)
at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:76)
at sun.reflect.GeneratedMethodAccessor133.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
... 17 more
Caused by: hudson.AbortException: None of the test reports contained any result
at hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:158)
at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:64)
at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:55)
at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousStepExecution.start(AbstractSynchronousStepExecution.java:34)
at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:137)
at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:98)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:15)
... 30 more
Finished: FAILURE
My suggestion: make ParallelStepException extend UndeclaredThrowableException, which ErrorAction unwraps automatically; rewrap a UndeclaredThrowableException thrown by replay (or, better, make whatever calls replay and turns it into an Outcome do this unwrapping); and if the inner exception is an AbortException, throw a wrapping AbortException which just prepends the branch name.
Bug
Minor
JENKINS-28119 Link to log of failed step
JENKINS-38156 Need branch name and other details from parallel branches
Another problem is that FlowInterruptedException is handled specially, but this is lost when it is wrapped in ParallelStepException, so for example the build in TimeoutStepTest.killingParallel winds up as FAILURE when it ought to have been ABORTED. Thus the several places that check for instanceof FlowInterruptedException (currently CpsThreadGroup.run, CatchErrorStep, and WorkflowRun.finish) needs to look for nested causes.