IV67823: CRASH DURING JIT COMPILATION IN INSTANCEOFORCHECKCAST

APAR status

• Closed as program error.

Error description

• Error Message: The JVM crashed with a GPF, with the javacore
  indicating the failure was in libj9jit27.so and that the JIT was
  actively compiling a method.  vmState starts with 0x0005, and is
  likely either 0x00050aff or 0x0051cff.
  .
  Stack Trace: Analysis of the system corefile will show that the
  crash occurred in instanceOfOrCheckCast during global value
  propagation. It is also possible that the same problem could
  occur in local value propagation.
  .
  

Local fix

• The problem can be avoided by either excluding the method being
  compiled at the time or by disabling the optimisations that
  could trigger the code path. If the method is
  a.b.Class.method(params) then it can be excluded with the
  option-Xjit:exclude={a/b/Class.method(*},dontInline={a/b/Class.m
  ethod(*}Or to disable the
  optimisations:-Xjit:disableGlobalVP,disableLocalVP
  

Problem summary

• While performing an analysis of variable types, the JIT
  incorrectly processed a special value representing the "unknown"
  type, propagating it to a portion of the analysis that wasn't
  designed to handle it.
  

Problem conclusion

• The JIT has been modified so that the special "unknown" value is
  correctly discarded rather than propagated.
  .
  This APAR will be fixed in the following Java Releases:
     7 R1 SR3         (7.1.3.0)
     7    SR9            (7.0.9.0)
     6 R1 SR8 FP4  (6.1.9.0)
     6    SR16 FP4   (6.0.17.0)
     8    SR1            (8.0.1.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the Service
  Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  
  Update: Corrected the Java Release infromation (Mar 3, 2016)
  

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

• R600 PSY

     UP