IV73861: SEGMENTATION FAULT IN THE JVM WHEN INVOKING A JNI METHOD IN A JI T COMPILED BODY

APAR status

• Closed as program error.

Error description

• Error Message: A segmentation fault is caught in the J9VM module
  when a JIT compiled method calls a native Java method using JNI.
  .
  Stack Trace: N/A
  .
  The problem is specific to the zOS and zLinux platforms.
  The issue only occurs on a 64-bit JVM under the
  -Xnocompressedrefs option. In the register dump generated in
  stderr one or more registers will have 0xFFFF in the most
  significant half-word.
  

Local fix

• The issue can be worked around by excluding the compilation of
  the method that invokes the problematic JNI call with the
  following JVM option:
  -Xjit:exclude={full_method_signature},dontInline={full_method_si
  gnature}
  Where full_method_signature is the method signature including
  the class path, method name, parameters, and return value.
  

Problem summary

• The problem is caused when the JIT compiler fails to generate an
  instruction which zeroes out the top half-word of a register
  containing a class pointer.
  

Problem conclusion

• The JIT compiler has been updated to properly zero out the top
  half-word of the register containing the class pointer for a JNI
  call.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR1 FP10  (8.0.1.10)
     7    SR9 FP 10 (7.0.9.10)
     5.0  SR16 FP13 (5.0.17.0)
     6 R1 SR8 FP7   (6.1.8.7)
     6    SR16 FP7  (6.0.16.7)
     7 R1 SR3 FP10  (7.1.3.10)
  .
  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:

  IV73862 IV73863 IV73867

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP

• R260 PSY

     UP

• R600 PSY

     UP