IV53160: UNEXPECTED EXCEPTIONS OR JVM CRASH

APAR status

• Closed as program error.

Error description

• This problem can manifest in different ways including unexpected
  application exceptions and JVM crashes.
  

Local fix

• The problem can be avoided using the command line option
  
  -Xjit:disableCHTable,disableCHOpts
  
  This may have some performance overhead, depending on the
  details of each application. Typically less than 10%
  
  An alternative is to use -Xnoclassgc which will not have the
  performance overhead but may lead to out of memory errors if the
  application makes use of generated classes.
  

Problem summary

• The problem occurs when an internal data structure is
  incorrectly zero initialized, overwriting memory following the
  data structure. The various symptoms that follow depend on what
  was previously stored in the overwritten memory and how much of
  it got corrupted. Symptoms may include failures during GC or
  class unloading, and on AMD64 at least, corruption of the low
  order byte of the class pointer of objects (a result of
  executing 0x0000 after the code cache was overwritten).
  The signature for this problem will be a JIT segment with
  missing footer, and a following segment with missing header.
  

Problem conclusion

• This defect will be fixed in the following Java Release:
     6    SR10       (6.0.10.0)
  .
  The JIT was modified to ensure that zero initialisation could
  not exceed the length of the data structure.
  

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

• R600 PSY

     UP