IJ26478: Z15 HIGH CPU UTILIZATION FOLLOWING Z/VM AND LINUX MIGRATION FROMZ14 TO Z15

APAR status

• Closed as program error.

Error description

• Error Message: NA
  .
  Stack Trace: NA
  .
  The symptom is an infinite loop (aka 100% CPU utilization) on
  decompression
  

Local fix

• NA
  

Problem summary

• Java looping issue due to missing EOF in the compressed stream
  

Problem conclusion

• A zlib issue incorrectly failed to generate an end-of-block
  marker when compressing raw streams (i.e. a compressed stream
  that does not have any wrappers like zip or gzip). The missing
  end-of-block marker caused the Java Inflater.finished() API to
  always return false. This behaviour may result in an endless
  looping symptom for code that loops until Inflater.finished()
  returns true.
  The private zlib library used by the JVM has been updated to
  correctly generate the end-of-block marker.  This issue is only
  seen on IBM z15 running Linux, starting with Java 8.0.6.0.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP16  (8.0.6.16)
  .
  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

• NA
  

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

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R800 PSY

     UP