IZ68010: 64-BIT ZLINUX/ZOS JAVA CRASH IN SYSTEM.ARRAYCOPY

APAR status

• Closed as program error.

Error description

• Error Message: A SIGSEGV/ABEND is raised when a JIT-compiled
  Java method attempts to call System.arraycopy with an unusual
  length or array index. The number has just been incremented from
  -1 to 0.
  The problem may also manifest itself as a crash in other
  locations, or incorrect computation involving a mixture of ints
  and longs.
  The problem only affects 64-bit 390, on both z/Linux and z/OS.
  .
  Stack Trace: N/A
  .
  

Local fix

• This issue can be avoided by setting the environment variable
  TR_NRECORDLGFR=1 before launching the JVM.
  

Problem summary

• The problem is caused when a 32-bit (int) value is sign-extended
  and assigned to a 64-bit (long) global register, which is later
  clobbered by an int operation, and then finally used for a long
  operation again. Under some circumstances, the JIT compiler may
  optimize away the required sign extension incorrectly.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR8
  5.0.0 SR12
  .
  The JIT compiler has been updated to correct the optimization.
  .
  To obtain the fix:
  Install build 20100126 or later
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ68006

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP