PM39346: Memory leak in Web Services SAX parser may lead to an OutOfMemoryError

6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• A memory leak in the Web Services SAX parser may lead to a
  java.lang.OutOfMemoryError. A tremendous growth in the number
  of com.ibm.xml.xlxp.scan.util.DataBuffer objects on the heap
  would be seen. Here is a sample from a heapdump that was
  collected during a stress test:
  
  ========================================================
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc1d8
    * com.ibm.xml.xlxp.api.util.SimpleDataBufferFactory @
  0x688f5260
      * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc208
      * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc238
      * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc268
      * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc438
      * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc468
      ...
  ========================================================
  
  When the memory leak occurs, the following stack trace or one
  similar to it will be seen in a javacore file:
  
  "WebContainer : 6" (TID:0x39EBBA00, sys_thread_t:0x383C3718,
  state:CW, native ID:0x00243027) prio=5
   at
  com/ibm/xml/xlxp/scan/util/XMLString$1.hasReferenceTo(XMLString.
  java:115(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleDataBufferFactory$DataBufferRefe
  rrerQueue.isReferenced(SimpleDataBufferFactory.java:76(Compiled
  Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleDataBufferFactory.reclaimBuffers
  (SimpleDataBufferFactory.java:235(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/encoding/ByteStreamDataSource.load(Byt
  eStreamDataSource.java:68(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/util/ParsedEntity.load(ParsedEntity.java:1
  75(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/util/SymbolTable.checkNextBuffer(SymbolTab
  le.java(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/util/SymbolTable.scanQNameBuffered2(Symbol
  Table.java:2192(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/util/SymbolTable.scanQNameBuffered(SymbolT
  able.java:1679(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleScannerHelper.scanQName(SimpleSc
  annerHelper.java:909(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/DocumentEntityScanner.scanStartElementBuff
  ered(DocumentEntityScanner.java:2302(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleScannerHelper.scanStartElementBu
  ffered(SimpleScannerHelper.java:931(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/DocumentEntityScanner.stateBufferedStartEl
  ement(DocumentEntityScanner.java:579(Compiled Code))
   at
  com/ibm/xml/xlxp/scan/DocumentEntityScanner.produceEvent(Documen
  tEntityScanner.java:646(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleScannerHelper.produceEvents(Simp
  leScannerHelper.java:332(Compiled Code))
   at
  com/ibm/xml/xlxp/api/util/SimpleScannerHelper.parseDocumentEntit
  y(SimpleScannerHelper.java:328(Compiled Code))
   at
  com/ibm/xml/xlxp/api/was/WSXMLReader.parseEvents(WSXMLReader.jav
  a:112(Compiled Code))
   at
  com/ibm/xml/xlxp/api/sax/impl/SAX2ParserBase.parseEntity(SAX2Par
  serBase.java:1335(Compiled Code))
   at
  com/ibm/xml/xlxp/api/sax/impl/SAX2ParserBase.parse(SAX2ParserBas
  e.java:1374(Compiled Code))
   at javax/xml/parsers/SAXParser.parse(Bytecode PC:55(Compiled
  Code))
   at
  com/ibm/ws/webservices/engine/utils/WebServicesParser.parse(WebS
  ervicesParser.java:361(Compiled Code))
   at
  com/ibm/ws/webservices/engine/encoding/DeserializationContextImp
  l.parse(DeserializationContextImpl.java:295(Compiled Code))
   ...
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server V6.1       *
  *                  users of the Feature Pack for Web Services  *
  *                  JAX-RPC client applications.                *
  ****************************************************************
  * PROBLEM DESCRIPTION: A memory leak in the Web Services SAX   *
  *                      parser may lead to an OutOfMemoryError  *
  ****************************************************************
  * RECOMMENDATION:  Install a fix pack containing this APAR.    *
  ****************************************************************
  A memory leak in the Web Services SAX parser may lead to a
  java.lang.OutOfMemoryError. A tremendous growth in the number
  of com.ibm.xml.xlxp.scan.util.DataBuffer objects on the heap
  would be seen. Here is a sample from a heapdump that was
  collected during a stress test:
  ========================================================
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc1d8
  * com.ibm.xml.xlxp.api.util.SimpleDataBufferFactory @
  0x688f5260
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc208
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc238
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc268
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc438
  * com.ibm.xml.xlxp.scan.util.DataBuffer @ 0x637fc468
  ...
  ========================================================
  

Problem conclusion

• The Web Services SAX parser has been corrected so that
  the memory leak no longer occurs.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 6.1.0.41.  Please refer to the Recommended Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP