IV67821: ON Z/OS JVM FAILS TO REMOVE SHARED MEMORY OF A SHARED CACHE CREA TED BY A JVM OF DIFFERENT ADDRESSING MODE WHEN RUNNING -XSHARECL

APAR status

• Closed as program error.

Error description

• Error Message: JVMSHRC625E Error opening shared memory region.
  Check for shared memory size failed.JVMSHRC663I Error recovery:
  destroyed semaphore set with id=1249288 associated with shared
  class cache.JVMSHRC661E The JVM failed to associate shared
  memory id=0 with the shared class cache.
  .
  Stack Trace: N/A
  .
  

Local fix

• There are two workarounds to this problem:1) If the user has not
  already issued -Xshareclasses:destroyAll, then make sure that
  the JVM being used is of same address mode as the shared class
  cache to be removed.2) If the user has already issued
  -Xshareclasses:destroyAll using JVM of different address mode
  than the shared cache, then the shared memory left behind can be
  removed by issuing 'ipcrm' command.
  

Problem summary

• This problem occurs on z/OS when the JVM attempts to destroy a
  shared class cache of different address mode. For instance a
  31-bit JVM removing a 64-bit shared cache or a 64-bit JVM
  removing a 31-bit shared cache. In such cases, the JVM cannot
  verify that the associated shared memory was created by a JVM
  (of another address mode) causing it to exit without removing
  the associated shared memory.
  

Problem conclusion

• The JVM has been updated to avoid removing any shared class
  cache of different address mode and display a message that a JVM
  of same address mode as the shared class cache be used to remove
  the cache.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP3   (6.1.8.3)
     7    SR8 FP10  (7.0.8.10)
     7 R1 SR2 FP10  (7.1.2.10)
  .
  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