IV58626: JAVA JIT CRASH IN VALUE PROPAGATION

APAR status

• Closed as program error.

Error description

• Error Message: A GPF, segmentation fault, or S0C4 ABEND is
  raised in the Java JIT compiler module (j9jit26). The Java core
  dump reports that the value of VM flags (vmState) is 0x000565ff.
  .
  Stack Trace:
  TR_VPClass::intersect1(TR_VPConstraint*,TR_ValuePropagation*)
  TR_VPConstraint::intersect(TR_VPConstraint*,TR_ValuePropagation*
  )
  TR_ValuePropagation::addConstraintToList(TR_Node*,int,int,TR_VPC
  onstraint*,...)
  TR_ValuePropagation::addBlockConstraint(TR_Node*,TR_VPConstraint
  *,TR_Node*,bool)
  .
  

Local fix

• This problem can be avoided by setting the -Xjit:disableGlobalVP
  option. Note that this option may cause some performance
  degradation.
  

Problem summary

• The value propagation optimization could, in some circumstances,
  insert a NULL pointer in one of its data structures and
  subsequently crash.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
   7 R1 SR3 (7.1.3.0)
   7 SR7 (7.0.7.0)
   6 R1 SR8 (6.1.8.0)
   6 SR16 FP4 (6.0.16.4)
   8 SR1 (8.0.1.0)
  .
  The JIT compiler has been fixed to check for this condition and
  prevent the insertion of the NULL pointer.
  

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:

  PI36290

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R260 PSY

     UP

• R600 PSY

     UP