IV26969: SPURIOUS PER ZAD EVENTS WHILE EXECUTING JIT-COMPILED CODE

APAR status

• Closed as program error.

Error description

• Error Message: When a PER (program event recording) ZAD (zero
  address detection) SLIP trap is set for a Java program running
  on z/OS 1.13 (or newer), the trap can be triggered unnecessarily
  by JIT-compiled methods which contain incorrectly encoded
  instructions that perform otherwise correct program logic. These
  spurious PER ZAD events make the use of the SLIP trap difficult
  or impossible.
  .
  Stack Trace: N/A
  .
  

Local fix

• N/A
  

Problem summary

• The problem is caused by the inappropriate use of registers by
  JIT-compiled code in the formation of memory addresses.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR11
  5.0.0 SR14
  .
  The JIT compiler has been updated to suppress the spurious PER
  ZAD events.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV26903

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP