IV55929: ILLEGAL INSTRUCTION EXCEPTION WITH SRST IN JIT-COMPILED METHOD

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  The issue is a specification exception with SRST because bits
  32-55 in GPR0 were not set to zero. Both z/OS and z/Linux are
  affected.
  

Local fix

• This problem can be avoided by setting the JVM option
  -Xjit:disableIdiomRecognition. However, it may cause some
  performance degradation
  

Problem summary

• The JIT compiler did not zero out bits 32-55 of GPR0 when using
  the SRST instruction, or bits 32-47 of GPR0 when using the SRSTU
  instruction.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     6 R1 SR8       (6.1.8.0)
     7    SR7       (7.0.7.0)
     7 R1 SR1       (7.1.1.0)
     6    SR16 FP40 (6.0.16.40)
  .
  The JIT compiler has been modified to zero out the appropriate
  bits of GPR0 whenever SRST or SRSTU is used.
  

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

• R260 PSY

     UP

• R130 PSY

     UP