IV71385: HANG WHEN PRODUCING JAVACORE DUMP ON THREAD START OR STOP EVENTS ON WINDOWS

APAR status

• Closed as program error.

Error description

• Error Message: Hang may occur when producing a javacore dump on
  a thread start or thread stop event on Windows. The normal
  JVMDUMP013I and JVMDUMP032I messages appear when the dump is
  triggered, for example:JVMDUMP013I Processed dump event
  "thrstop", detail "".JVMDUMP032I JVM requested Java dump using
  'C:\dumps\javacore-stop-0028.txt' in response to an eventBut the
  normal JVMDUMP010I and JVMDUMP013I messages on completion of the
  javacore dump fail to appear.
  .
  Stack Trace:
  ntdll!NtWaitForSingleObject+0xantdll!AlpcFreeCompletionListMessa
  ge+0x1f1ntdll!RtlEnterCriticalSection+0xe4ntdll!LdrLockLoaderLoc
  k+0x1c0ntdll!RtlEqualWnfChangeStamps+0x96bntdll!LdrGetDllHandleE
  x+0xa3antdll!LdrLoadDll+0x99KERNELBASE!LoadLibraryExW+0xcaj9prt2
  8!j9getdbghelp_loadDLL+0x31j9prt28!load_dbg_library+0xa5j9prt28!
  j9introspect_threads_startDo_with_signal+0x12aj9prt28!runInTryEx
  cept+0x16j9prt28!j9sig_protect+0x1cdj9dmp28!JavaCoreDumpWriter::
  writeThreadsWithNativeStacks+0x381j9dmp28!protectedWriteThreadsW
  ithNativeStacks+0xdj9prt28!runInTryExcept+0x16j9prt28!j9sig_prot
  ect+0x1cdj9dmp28!JavaCoreDumpWriter::writeThreadSection+0x155j9d
  mp28!protectedWriteSection+0xaj9prt28!runInTryExcept+0x16
  .
  

Local fix

• Disable native stack collection in javacore dumps by setting the
  -Xdump:java:request=exclusive option.
  

Problem summary

• The problem occurs when the JVM attempts to load the debug
  library dbghelp.dll.
  

Problem conclusion

• The JVM has been updated to prevent the hang by not loading the
  debug library on the thread start and thread stop dump events.
  .
  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:

  IV71386

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

     UP

• R260 PSY

     UP