IJ30307: AN ASSERT IN OMRCONSTANTDATASNIPPET.HPP MAY TRIGGER

APAR status

• Closed as program error.

Error description

• Error Message: An assert message of the form
  "instr4->getBinaryEncoding() == instr1->getBinaryEncoding() +
  16"
  VMState: 0x0005ff0a
      Instruction 0x7fff8a02e6f0 <OSB>lfd<CSB> (generated from
  node 0x7fff89bf5870 <OSB>dconst<CSB>): Unexpected
  ConstantDataSnippet load sequence
  compiling
  org/apache/derby/exe/aced8940a7x0175xc997x60e7x00000040d8183.cre
  ateResultSet()Lorg/apache/derby/iapi/sql/ResultSet; at level:
  warm
  .
  Stack Trace: #0:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x8b936
  4) <OSB>0x7fff9bc29364<CSB>
  #1:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x8c96f
  4) <OSB>0x7fff9bc396f4<CSB>
  #2:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x56592
  4) <OSB>0x7fff9b8d5924<CSB>
  #3:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x56658
  8) <OSB>0x7fff9b8d6588<CSB>
  #4:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x92793
  0) <OSB>0x7fff9bc97930<CSB>
  #5:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x91c8d
  c) <OSB>0x7fff9bc8c8dc<CSB>
  #6:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x4c9be
  8) <OSB>0x7fff9b839be8<CSB>
  #7:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x4d2c1
  c) <OSB>0x7fff9b842c1c<CSB>
  #8:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x4d206
  c) <OSB>0x7fff9b84206c<CSB>
  #9:
  /home/jazz_build/Build/jbe/jvms/ibm-java-ws-sdk-pxl6480sr6fp20-2
  0201103_01/jre/lib/ppc64le/compressedrefs/libj9jit29.so(+0x4cf50
  4) <OSB>0x7fff9b83f504<CSB>
  ...
  .
  This issue only occurs on Power
  

Local fix

• Use -Xjit:exclude={<method name>} where <method name> is
  the name
  of the method being compiled printed in the error message. For
  example, for the case above it would be:
  -Xjit:exclude={org/apache/derby/exe/aced8940a7x0175xc997x60e7x00
  000040d8183.createResultSet()Lorg/apache/derby/iapi/sql/ResultSe
  t;}
  Multiple methods can be separated with <PIPE>
  

Problem summary

• When generating code for accessing constant data, a sequence of
  instructions is generated that later needs to be patched. The
  Assert was added to detect potential defects when some other
  instructions are inserted in the middle of the patch sequence,
  in particular, extra instructions can be inserted for register
  spills
  

Problem conclusion

• A code was added to avoid register spills in the middle of the
  code sequence that needs to be patched
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP25  (8.0.6.25)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

  JIT

• Fixed component ID

  620700124

Applicable component levels