IJ14827: ASSERTION FAILURE DURING GC PROCESSING OF REPLACED CLASS'S CALLSITES TABLE

APAR status

• Closed as program error.

Error description

• Error Message: The following error message is found from the
  snap trace messages:
  0x1BAD3900 j9mm.621             Event       GC Assertion
  message: Pointer: 0000000099669966 has is not object aligned (to
  8 bytes)
  0x0 j9mm.621             Event       GC Assertion message:
  Pointer: 0000000099669966 has is not object aligned (to 8 bytes)
  *0x1BAD3900 j9mm.141             Assert     * ** ASSERTION
  FAILED ** at ./MarkingScheme.hpp:110: ((false))
  .
  Stack Trace: The stack trace looks like this:
  ......
  libj9trc28.so::javaTrace+0x94
  MM_MarkingScheme::markObject(MM_EnvironmentBase*,J9Object*,bool)
  +0x314
  MM_CollectorLanguageInterfaceJava::private_markingScheme_complet
  eClassMark(MM_EnvironmentBa...+0xbf0
  MM_CollectorLanguageInterfaceJava::markingScheme_completeMarking
  (MM_EnvironmentBase*)+0x3a
  MM_MarkingScheme::markLiveObjectsScan(MM_EnvironmentBase*)+0x28
  ......
  .
  

Local fix

Problem summary

• The problem is caused when the callsites table of a hot swapped
  class is not properly updated.
  

Problem conclusion

• The JVM has been updated to prevent the crash from occurring
  when a class is hot swapped.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5       (8.0.5.0)
  .
  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