IV78209: JAVA SEGMENTATION ERROR IN VALUE PROPAGATION

APAR status

• Closed as program error.

Error description

• Error Message: The JIT compiler crashes with a general
  protection fault during value propagation.
  .
  Stack Trace: The compiler's stack trace shows that the crash
  occurred in
          TR_VPMergedConstraints::longMerge.
  .
  

Local fix

• The problem can be avoided using the option
  -Xjit:disableGlobalVP,disableLocalVP. If applied globally this
  may have a significant cost in performance which will vary from
  application to application around 20%. The option can be applied
  to individual methods if preferred.
  

Problem summary

• In certain circumstances, an optimization called value
  propagation could associate ill-typed analysis results with
  operations in the intermediate code.
  

Problem conclusion

• The JIT compiler has been modified so that these analysis
  results
        will now be well-typed.
  
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
     7 R1 SR3 FP20  (7.1.3.20)
  .
  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

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