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Spike in CPU usage resulting in online service disruption

SA-88078

Summary



User node stops working after high CPU usage. This occurs when threads enter infinite loops.


Error Messages



"http-/127.0.0.1:8463-11" Id=280 in RUNNABLE
BlockedCount : 1341, BlockedTime : -1, WaitedCount : 1032, WaitedTime : -1
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1320)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1355)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1355)
    .........
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1355)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1355)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getAllReferences(ClipboardPropertyBase.java:1257)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.finishChangeTracking(ClipboardPropertyBase.java:3303)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.trackChange(ClipboardPropertyBase.java:3328)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageBase.trackChange(ClipboardPageBase.java:1555)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.put(ClipboardPageImpl.java:2256)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putCopy(ClipboardPageImpl.java:3426)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:3263)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:2901)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.mimic(ClipboardPropertyImpl.java:2250)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.mimic(ClipboardPropertyImpl.java:2298)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putCopy(ClipboardPageImpl.java:3427)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:3263)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:2901)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.mimic(ClipboardPropertyImpl.java:2250)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putCopy(ClipboardPageImpl.java:3427)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:3263)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:2901)
    ...........
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.mimic(ClipboardPropertyImpl.java:2250)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putCopy(ClipboardPageImpl.java:3427)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:3263)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.putAll(ClipboardPageImpl.java:2901)
    at com.pega.pegarules.data.internal.clipboard.PropertyDataPageWrapper.getPageAfterCopy(PropertyDataPageWrapper.java:1547)
    at com.pega.pegarules.data.internal.clipboard.PropertyDataPageWrapper.populateDataFromPage(PropertyDataPageWrapper.java:1249)
    at com.pega.pegarules.data.internal.clipboard.PropertyDataPageWrapper.refresh(PropertyDataPageWrapper.java:1020)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getValue(ClipboardPropertyImpl.java:4421)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyBase.getValue(ClipboardPropertyBase.java:3197)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getPageValue(ClipboardPropertyImpl.java:3506)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getPageValue(ClipboardPropertyImpl.java:3475)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.hasMessagesInner(ClipboardPageImpl.java:4670)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.hasMessages(ClipboardPageImpl.java:4631)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.hasMessages(ClipboardPageImpl.java:4699)
    at com.pega.pegarules.data.internal.clipboard.PropertyDataPageWrapper.populateDataFromPage(PropertyDataPageWrapper.java:1261)
    at com.pega.pegarules.data.internal.clipboard.PropertyDataPageWrapper.refresh(PropertyDataPageWrapper.java:1020)
    at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.getValue(ClipboardPropertyImpl.java:4421)



Steps to Reproduce



Not Applicable


Root Cause



A defect or configuration issue in the operating environment.
The hasMessages API triggered the Auto Populate and entered an infinite loop. This caused a CPU spike and as a result, the node stopped working.


Resolution



Apply HFix-56351.
Suggest Edit

Published March 19, 2020 - Updated October 8, 2020

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