IZ88265: JAVA 6 SR8 HANGS WHILE OPENING A SHARED CLASSES CACHE.

APAR status

• Closed as program error.

Error description

• Error Message: Java 6 SR8 hangs while opening a shared classes
  cache.
  .
  Stack Trace: #1  0x0000002a96400ebe in semopWrapper () from
  jre/lib/amd64/default/libj9prt24.so
  #2  0x0000002a96410a8e in j9shsem_deprecated_wait () from
  jre/lib/amd64/default/libj9prt24.so
  #3  0x0000002a97c33693 in SH_OSCachesysv::enterHeaderMutex ()
  from jre/lib/amd64/default/libj9shr24.so
  #4  0x0000002a97c31c7c in SH_OSCachesysv::startup () from
  jre/lib/amd64/default/libj9shr24.so
  #5  0x0000002a97c24434 in SH_CompositeCacheImpl::startup () from
  jre/lib/amd64/default/libj9shr24.so
  #6  0x0000002a97c1597c in SH_CacheMap::startup () from
  jre/lib/amd64/default/libj9shr24.so
  #7  0x0000002a97c1368a in j9shr_init () from
  jre/lib/amd64/default/libj9shr24.so
  #8  0x0000002a97c0cee0 in J9VMDllMain () from
  jre/lib/amd64/default/libj9shr24.so
  #9  0x0000002a960ac766 in runJ9VMDllMain () from
  jre/lib/amd64/default/libj9vm24.so
  #10 0x0000002a960cde90 in pool_do () from
  jre/lib/amd64/default/libj9vm24.so
  #11 0x0000002a960ac66f in runInitializationStage () from
  jre/lib/amd64/default/libj9vm24.so
  #12 0x0000002a960b0e47 in protectedInitializeJavaVM () from
  jre/lib/amd64/default/libj9vm24.so
  #13 0x0000002a964127a1 in j9sig_protect () from
  jre/lib/amd64/default/libj9prt24.so
  #14 0x0000002a960a98ae in initializeJavaVM () from
  jre/lib/amd64/default/libj9vm24.so
  #15 0x0000002a96097ef1 in JNI_CreateJavaVM () from
  jre/lib/amd64/default/libj9vm24.so
  #16 0x0000002a95e4e518 in JNI_CreateJavaVM () from
  jre/lib/amd64/default/libjvm.so
  #17 0x0000002a95bcbff7 in JNI_CreateJavaVM () from
  jre/lib/amd64/j9vm/libjvm.so
  #18 0x0000000000403d61 in InitializeJVM ()
  #19 0x0000000000402500 in JavaMain ()
  #20 0x0000002a95673b8f in start_thread () from
  /lib64/tls/libpthread.so.0
  #21 0x0000002a95a4a633 in clone () from /lib64/tls/libc.so.6
  #22 0x0000000000000000 in ?? ()
  .
  

Local fix

• Do not open caches created by any ifixes or non base Java 6 SR8
  JVM using Java 6 SR8.
  

Problem summary

• This problem is fixed in Java 6 SR9, and only exists in Java 6
  SR8.
  
  
  The problem occurs when a cache created by a driver
  built on the Java 6 SR8 base, for example Java 6 SR8 FP1 or Java
  6 SR8
  ifixes, is opened using Java 6 SR8
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR9
  .
  The SR9 JVM has been updated to release the 'cache header lock'
  when it detects that a cache was created by a different JVM.
  .
  To obtain the fix:
  Install build 20101016 or later
  

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:

  PM30723

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R600 PSN

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