IJ09601: JAVA JIT: JVM CRASHES ON A SIGBUS SIGNAL WHEN ACCESSING A DIRECTBYTEBUFFER

APAR status

• Closed as program error.

Error description

• Error Message: Crash with a SIGBUS
  .
  Stack Trace: 0x090000001a70dbd8
  {libj9jit29.so}{__quadWordArrayCopy_vsx} <OSB>0x1002b861370<CSB>
  0x00000100124e8bbc {java/nio/DirectByteBuffer.get} JIT
  <OSB>0x326b1b50<CSB>
  0x000001002211ec2d {java/nio/HeapByteBuffer.put} INT
  <OSB>0x326b1c40-0x326b1c98<CSB>
  .
  The problem can only occur on PPC platforms (AIX & Linux PPC).
  

Local fix

• N/A
  

Problem summary

• The JVM will convert SIGBUS signals originating from the
  execution of Java code into a InternalError exception. When an
  arraycopy is executed against a DirectByteBuffer the JIT uses a
  native helper to perform the copy, but if this copy results in a
  SIGBUS the JIT would not convert to an exception because the
  signal occurred outside JIT compiled code.
  

Problem conclusion

• The JIT was modified so that a SIGBUS signal from a JIT helper
  routine called from JIT compiled code will be converted into a
  InternalError exception.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP22  (8.0.5.22)
  .
  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