IV99780: CRASHES IN JIT-COMPILED JAVA CODE CONTAINING LOOPS

APAR status

• Closed as program error.

Error description

• Error Message: User observed a crash of the following form:
  Unhandled exception
  Type=Segmentation error vmState=0x00000000
  ...
  <irrelevant platform-specific details omitted>
  ...
  Compiled_method=java/awt/image/SampleModel.getSamples(IIIII<OSB>
  FLjava/awt/image/DataBuffer;)<OSB>F
  .
  Stack Trace: N/A
  .
  

Local fix

• This problem can be worked around using the
  -Xjit:disableLoopVersioner option. Note that using this option
  may cause a modest performance degradation.
  

Problem summary

• The JIT compiler incorrectly optimizes certain frequently
  executed loops and emits code that may crash or produce
  incorrect results.
  

Problem conclusion

• The JIT compiler has been modified to correctly and safely
  optimize such loops.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR5 (8.0.5.0)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP