SA-16454

Summary

When tracer is run simultaneously by multiple developers, the system crashes.

Error Messages

The stack loops back to TraceEvent repeatedly.
  java.lang.StackOverflowError
    at com.pega.pegarules.priv.factory.IntArrayFactory.acquire(IntArrayFactory.java:88)
    at com.pega.pegarules.pub.util.PRDateFormat.formatIDT(PRDateFormat.java:628)
    at com.pega.pegarules.exec.internal.util.PRDateTimeUtilsImpl.getCurrentTimeStamp(PRDateTimeUtilsImpl.java:730)
    at com.pega.pegarules.monitor.internal.tracer.events.TraceEventBaseImpl.ctorCommon(TraceEventBaseImpl.java:241)
    at com.pega.pegarules.monitor.internal.tracer.events.TraceEventBaseImpl.<init>(TraceEventBaseImpl.java:237)
    at com.pega.pegarules.monitor.internal.tracer.TraceEvent.<init>(TraceEvent.java:236)
    at com.pega.pegarules.monitor.internal.tracer.TracerSessionImpl.logTraceEvent(TracerSessionImpl.java:571)
    at com.pega.pegarules.session.internal.mgmt.Executable.logTraceEvent(Executable.java:1468)
    at com.pega.pegarules.session.internal.mgmt.Executable.logTraceEvent(Executable.java:1454)
    at com.pega.pegarules.exec.internal.declare.infengine.pages.DeclarativePageDirectoryImpl.trace(DeclarativePageDirectoryImpl.java:967)
    at com.pega.pegarules.exec.internal.declare.infengine.pages.DeclarativePageDirectoryImpl.trace(DeclarativePageDirectoryImpl.java:958)
    at com.pega.pegarules.exec.internal.declare.infengine.pages.DeclarativePageDirectoryImpl.isDeclarePageFresh(DeclarativePageDirectoryImpl.java:1037)
    at com.pega.pegarules.session.internal.mgmt.base.handler.ReadOnlyDataPageHandler.findDataPage(ReadOnlyDataPageHandler.java:321)
    at com.pega.pegarules.session.internal.mgmt.base.AbstractPageDirectory.findDataPageInCurrentDir(AbstractPageDirectory.java:893)
    at com.pega.pegarules.session.internal.mgmt.base.AbstractPageDirectory.getDirectPage(AbstractPageDirectory.java:658)
    at com.pega.pegarules.session.internal.mgmt.base.ThreadPageDir.getDirectPage(ThreadPageDir.java:473)
    at com.pega.pegarules.session.internal.mgmt.base.ThreadPageDir.getPage(ThreadPageDir.java:431)
    at com.pega.pegarules.session.internal.mgmt.base.ThreadPageDir.getPage(ThreadPageDir.java:423)
    at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.getPage(PRThreadImpl.java:508)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.getTopPage(PropertyReferenceImpl.java:2192)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.getTopPage(PropertyReferenceImpl.java:2136)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.resolveEmbeddedPages(PropertyReferenceImpl.java:1817)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.doGet(PropertyReferenceImpl.java:1392)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.doGet(PropertyReferenceImpl.java:1372)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.getIfPresent(PropertyReferenceImpl.java:1683)
    at com.pega.pegarules.data.internal.clipboard.PropertyReferenceImpl.getIfPresent(PropertyReferenceImpl.java:1670)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.getIfPresent(ClipboardPageImpl.java:1203)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.getIfPresent(ClipboardPageImpl.java:1146)
    at com.pega.pegarules.data.internal.clipboard.ReferencePropertyLinkImpl.getSource(ReferencePropertyLinkImpl.java:386)
    at com.pega.pegarules.data.internal.clipboard.ReferencePropertyLinkImpl.getSource(ReferencePropertyLinkImpl.java:318)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getReferenceString(ClipboardPropertyImpl.java:5352)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getReferenceString(ClipboardPropertyImpl.java:5342)
    at com.pega.pegarules.data.internal.clipboard.WorkbenchXMLStream.writeXMLBeginProperty(WorkbenchXMLStream.java:463)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.writeXMLProperty(XMLStream.java:929)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.writeXMLPage(XMLStream.java:753)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.writeXMLProperty(XMLStream.java:937)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.writeXMLProperty(XMLStream.java:956)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.writeXMLPage(XMLStream.java:753)
    at com.pega.pegarules.data.internal.clipboard.XMLStream.clipboardToXML(XMLStream.java:499)
    at com.pega.pegarules.data.internal.clipboard.WorkbenchXMLStream.<init>(WorkbenchXMLStream.java:216)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageBase.getXML(ClipboardPageBase.java:2148)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.getXML(ClipboardPageImpl.java:481)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageBase.getXML(ClipboardPageBase.java:2133)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.getXML(ClipboardPageImpl.java:481)
    at com.pega.pegarules.monitor.internal.tracer.events.TraceEventBaseImpl.getPageXML(TraceEventBaseImpl.java:1054)
    at com.pega.pegarules.monitor.internal.tracer.events.TraceEventBaseImpl.setPrimaryPage(TraceEventBaseImpl.java:997)
    at com.pega.pegarules.monitor.internal.tracer.events.TraceEventBaseImpl.setPrimaryPageData(TraceEventBaseImpl.java:822)
    at com.pega.pegarules.monitor.internal.tracer.TraceEvent.<init>(TraceEvent.java:287)
    at com.pega.pegarules.monitor.internal.tracer.TracerSessionImpl.logTraceEvent(TracerSessionImpl.java:571)
 

Steps to Reproduce

1. Have two developers log in
2. Start Tracer and connect to the same session
3. Start tracing

Root Cause

The root cause of this issue is operator error. The developers involved had tracer options enabled which were set at a level such that each developer's tracer utility was tracing the opposite developer's tracer utility, creating an infinite loop. This infinite loop crashed the server.  
 

Resolution

Do not set your tracer to trace another user's tracer session. You should generally trace only what you need rather than tracing everything - such as limiting the tracer to specific rulesets.