IJ07725: CRASH IN SYNCHRONIZED REGION INVOLVING LPD INSTRUCTION

APAR status

• Closed as program error.

Error description

• Error Message: The JVM crashes with segmentation fault.
  
  
  .
  Stack Trace: One posible stack trace:
  javax/swing/text/AbstractDocument$DefaultDocumentEvent.addEdit(A
  bstractDocument.java:2777)
  javax/swing/text/DefaultStyledDocument$ElementBuffer.create(Defa
  ultStyledDocument.java:1493)
  javax/swing/text/DefaultStyledDocument.create(DefaultStyledDocum
  ent.java:160)
  javax/swing/text/html/HTMLDocument.create(HTMLDocument.java:480)
  javax/swing/text/html/HTMLDocument$HTMLReader.flushBuffer(HTMLDo
  cument.java:3747)
  javax/swing/text/html/HTMLDocument$HTMLReader.flush(HTMLDocument
  .java:2549)
  javax/swing/text/html/HTMLEditorKit.read(HTMLEditorKit.java:273)
  
  Note: This problem can occur in other methods. This problem can
  only happen on z Systems z196 or later hardware. This problem
  was introduced in Java 8 SR5.
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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Local fix

• This crash can be avoided if the
  -Xjit:disableSynchronizedFieldLoad is used.
  

Problem summary

• A crash can happen in Java JIT compiled code
  when the synchronized field load optimization is enabled. This
  optimization fails to sign extend a 32-bit object field after
  loading it from memory. A value without proper sign extension
  can contain garbage in the high order and lead to segmentation
  faults should it be used to address memory.
  

Problem conclusion

• The JIT compiler has been updated to prevent the crash from
  occurring when loading 32-bit Java object fields in synchronized
  regions.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP20  (8.0.5.20)
  .
  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

  JIT

• Fixed component ID

  620700124

Applicable component levels