IV72272: SEGMENTATION ERROR VALUE PROPAGATION

APAR status

• Closed as program error.

Error description

• Error Message: Unhandled exceptionType=Segmentation error
  vmState=0x00051cff
  .
  Stack Trace: The stack trace in gdb will most likely contain the
  following
  methods:._ZN15TR_VPConstraint9intersectEPS_P19TR_ValuePropagatio
  n
  ()._ZN19TR_ValuePropagation19addConstraintToListEP7TR_NodeiiP15T
  R_VPConstraintP12TR_HedgeTreeINS_15ValueConstraintEEb
  ()._ZN19TR_ValuePropagation18addBlockConstraintEP7TR_NodeP15TR_V
  PConstraintS1_b
  ()._ZN19TR_ValuePropagation13getConstraintEP7TR_NodeRbS1_
  ()._Z12findConstantP19TR_ValuePropagationP7TR_Node ()
  .
  N/A
  

Local fix

• -Xjit:disableGlobalValuePropagation,disableLocalValuePropagation
  will prevent the crash.  Any resulting performance degradation
  can be mitigated by limiting this option to the method being
  compiled at the time of the crash.
  

Problem summary

• The Value Propagation optimization attempted to obtain type
  information for a certain expression in the program, and this
  required the optimization to obtain a lock.  If the optimization
  was unable to acquire the lock immediately (which could occur
  during garbage collection), it chose to continue without the
  desired type information, but subsequent processing was unable
  to proceed without the information, and crashed.
  

Problem conclusion

• The optimization was changed to wait for the lock, thereby
  ensuring that it always obtains the desired type information.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR9       (7.0.9.0)
     7 R1 SR3       (7.1.3.0)
     6 R1 SR8 FP4   (6.1.8.4)
  .
  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

• R130 PSY

     UP

• R260 PSY

     UP