IV70972: ON Z/OS, GPR15 MAY BE CLOBBERED WHEN THE JAVA VM REDUCES THE SIZ E OF ITS OBJECT HEAP

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• The problem affects both the 31 and the 64-bit builds.The
  problem can only be observed if the Java VM attempts to reduce
  the size of its object heap, which is not a very common
  occurrence. If it does try to do so, it is possible the value of
  the GPR15 register will be clobbered by the routine it uses to
  reduce the size of the heap. If this problem is observed, it
  will likely cause failures on the logic of the internal function
  used to reduce the size of the heap. It is undefined what the
  customer would see as a result. A wide range of potential
  problems can arise from this incorrect behavior.
  

Problem conclusion

• The code was fixed in order to make sure the value of GPR15 is
  properly saved and restored.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP4   (6.1.8.4)
     7    SR9       (7.0.9.0)
     7 R1 SR3       (7.1.3.0)
  .
  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/
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP

• R270 PSY

     UP