IV73742: PARTIALLY USED LAST PAGE IN DEBUG DATA AREA IN SHARED CACHE IS N OT MARKED READ-ONLY

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  Because the last page used in the debug data area is not memory
  protected as read-only by the JVM, there is a chance of this
  page getting corrupt, which may result in unexpected behavior
  including crash when any attempt is made to access the corrupt
  data in the page.
  

Local fix

• N/A
  

Problem summary

• JVM does not mark the last used page of debug data area as
  read-only when it determines that no more data can be added to
  the debug data area of the shared cache. This leaves the data in
  that page open to corruption which can cause unexpected behavior
  in the JVM accessing the corrupt data.
  

Problem conclusion

• JVM has been updated to mark the partially filled page of debug
  data area as read-only once it determines that no more data can
  be added to the debug data area of the shared class cache.
  .
  This APAR will be fixed in the following Java Releases:
     7 R1 SR3 FP10  (7.1.3.10)
     8    SR1 FP10  (8.0.1.10)
     6 R1 SR8 FP7   (6.1.8.7)
     7    SR9 FP 10 (7.0.9.10)
  .
  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:

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

     UP

• R260 PSY

     UP