PI26809: JAVA/LANG/STACKOVERFLOWERROR WITH LOOP IN NTV_MAPDIRECTBYTEBUFF

8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• Javacore produced shows:
  
  "java/lang/StackOverflowError"
  
  
  The thread in error shows native routine
  SAFCredentialsServiceImpl.ntv_isMixedCasePWEnabled
  calling java to write a trace. In order to write the
  trace native, routine ntv_mapDirectByteBuff is
  called which then calls java to write a trace. This
  results in a loop though because it needs to call native routine
   ntv_mapDirectByteBuff again to write the trace.
  
  loop is
  at
  com/ibm/ws/zos/core/utils/internal/NativeUtilsImpl.ntv_mapDirect
  ByteBuff
  er(Native Method)
  at
  com/ibm/ws/zos/core/utils/internal/NativeUtilsImpl.mapDirectByte
  Buffer(N
  ativeUtilsImpl.java:127)
  at
  com/ibm/ws/zos/core/utils/internal/DirectBufferHelperImpl.mapDir
  ectByteB
  uffer(DirectBufferHelperImpl.java:341)
  at
  com/ibm/ws/zos/core/utils/internal/DirectBufferHelperImpl.getSeg
  ment(Dir
  ectBufferHelperImpl.java:311)
  at
  com/ibm/ws/zos/core/utils/internal/DirectBufferHelperImpl.getSli
  ce(Direc
  tBufferHelperImpl.java:160)
  at
  com/ibm/ws/zos/logging/internal/NativeTraceHandler.getTraceObjec
  ts(Nativ
  eTraceHandler.java:370)
  at
  com/ibm/ws/zos/logging/internal/NativeTraceHandler.writeNativeTr
  ace(Nati
  veTraceHandler.java:349)
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty Profile on z/OS              *
  ****************************************************************
  * PROBLEM DESCRIPTION: java/lang/StackOverflowError when all   *
  *                      native tracing is enabled.              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The thread in error shows native routine
  SAFCredentialsServiceImpl.ntv_isMixedCasePWEnabled
  calling java to write a trace. In order to write the
  trace native, routine ntv_mapDirectByteBuff is
  called which then calls java to write a trace. This
  results in a loop because it needs to call native routine
  ntv_mapDirectByteBuff again to write the trace.
  

Problem conclusion

• The native trace, 4007003, causing the loop has been deleted.
  The fix for this APAR is currently targeted for inclusion in fix
  pack 8.5.5.4.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

• Do not turn on all tracing, zos.native.*=all or
  zos.native.04.007=all.
  

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

  LIBERTY - Z/OS

• Fixed component ID

  5655W6514

Applicable component levels

• R850 PSY

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