IJ20908: SEGMENTATION ERROR FROM LIBJ9VM29

APAR status

• Closed as program error.

Error description

• Error Message: Segmentation error or a GPF event raised from
  libj9vm29.
  .
  Stack Trace: The stack trace for this problem is different for
  each run, but often looks related to hash table or AVL tree
  structures. One such trace is below:
      frame #13: 0x00007fff9b7adf1a
  libsystem_platform.dylib`_sigtramp + 26
      frame #14: 0x000000000ced0a45
  libj9vm29.dylib`segmentInsertionComparator + 5
      frame #15: 0x000000000cfe65f2 libj9vm29.dylib`insertNode +
  194
      frame #16: 0x000000000cfe6621 libj9vm29.dylib`insertNode +
  241
      frame #17: 0x000000000cfe6621 libj9vm29.dylib`insertNode +
  241
      frame #18: 0x000000000cfe6621 libj9vm29.dylib`insertNode +
  241
      frame #19: 0x000000000cfe6621 libj9vm29.dylib`insertNode +
  241
      frame #20: 0x000000000cfe6621 libj9vm29.dylib`insertNode +
  241
      frame #21: 0x000000000cfe651d libj9vm29.dylib`avl_insert +
  29
      frame #22: 0x000000000ced088f
  libj9vm29.dylib`allocateVirtualMemorySegmentInListInternal + 559
      frame #23: 0x000000000cecffe3
  libj9vm29.dylib`allocateMemorySegmentInList + 147
      frame #24: 0x000000000ce91f7d
  libj9vm29.dylib`allocateClassMemorySegment + 205
      frame #25: 0x000000000ce9b752
  libj9vm29.dylib`internalCreateRAMClassFromROMClassImpl(J9VMThrea
  d*, J9ClassLoader*, J9ROMClass*, unsigned long, J9Class*,
  J9ROMMethod**, long, int, J9Class*, unsigned long, J9Class*,
  J9CreateRAMClassState*, J9ClassLoader*, J9Class*, J9Module*) +
  9298
      frame #26: 0x000000000ce985e9
  libj9vm29.dylib`internalCreateRAMClassFromROMClass + 2825
      frame #27: 0x000000000cfd2733
  libj9vm29.dylib`internalDefineClass + 2883
      frame #28: 0x000000000ec8f879
  libjclse29.dylib`defineClassCommon + 1897
      frame #29: 0x000000000ec823bd
  libjclse29.dylib`Java_java_lang_ClassLoader_defineClassImpl +
  173
      frame #30: 0x00000000236d4653
      frame #31: 0x000000000ce8c48d libj9vm29.dylib`sendLoadClass
  + 429
      frame #32: 0x000000000ce936b6
  libj9vm29.dylib`internalFindClassInModule + 5126
      frame #33: 0x000000000cecb0ca
  libj9vm29.dylib`resolveClassRef + 506
      frame #34: 0x000000000ce305a7
  libj9vm29.dylib`VM_BytecodeInterpreter::run(J9VMThre
  .
  

Local fix

Problem summary

• The problem was caused by an error in class memory calculation
  introduced.
  

Problem conclusion

• The JVM has been updated with the correct memory calculations.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6       (8.0.6.0)
  .
  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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

     UP