IJ30975: CRASH WHEN OUTPUTTING TO VERBOSE GC LOG USING THE SPECIFIER CHARACTERS.

APAR status

• Closed as program error.

Error description

• Error Message: GPF
  .
  Stack Trace: writeSpec+0x45
  omrstr_vprintf+0x13c
  omrfile_vprintf+0x41
  omrfile_printf+0x6d
  MM_VerboseWriterFileLoggingSynchronous::openFile+0x165
  MM_VerboseWriterFileLogging::endOfCycle+0x56
  MM_VerboseWriterChain::endOfCycle+0x2c
  MM_VerboseHandlerOutput::handleExclusiveEnd+0x164
  J9HookDispatch+0x150
  MM_EnvironmentBase::reportExclusiveAccessRelease+0x5d
  MM_EnvironmentBase::unwindExclusiveVMAccessForGC+0x129
  OMR_GC_AllocateObject+0x455
  J9AllocateObject+0x27c
  old_slow_jitNewObject+0x270
  jitNewObject+0x88
  .
  

Local fix

• There are some workarounds
  - disable the verbose GC log
  - switch verbose GC log generation from circular number of files
  to single file
  - inspect Java command line option and remove/change any options
  using % character
  

Problem summary

• The problem occurs when the user customizes command options line
  with specifier characters starting with '%'
  

Problem conclusion

• JVM has been updated to use the proper output interface function
  .
  This APAR will be fixed in the following Java Releases:
   8 SR6 FP26 (8.0.6.26)
  .
  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