IJ08655: FLOATING POINT ERROR (SIGFPE) IN ZJ9SYM1 OR ANY VM/JIT MODULE ON AN INSTRUCTION FOLLOWING A VECTOR INSTRUCTION

APAR status

• Closed as program error.

Error description

• Error Message: Floating point error (SIGFPE) reported upon JVM
  startup on a z13 (or later) processor.
  .
  Stack Trace: 0x000000007ca00356 {libj9vm29.so}{ZJ9SYM1} <OSB>
  0x000000007ca08ca4 {libj9vm29.so}{sendClinit}
  0x000000007cadf7ac {libj9vm29.so}{initializeImpl}
  0x000000007cae1258
  {libj9vm29.so}{classInitStateMachine(J9VMThread*,J9Class*,J9Clas
  sInitState)}
  0x000000007cae177e {libj9vm29.so}{initializeClass}
  0x000000007a61eb46 {libjclse7b_29.so}{initializeRequiredClasses}
  0x000000007a66055a {libjclse7b_29.so}{standardInit}
  0x000000007a674996 {libjclse7b_29.so}{J9VMDllMain}
  .
  

Local fix

• This problem can be worked around by specifying the
  -Xjit:disableZ13 command line to the JVM. Note that specifying
  this option will prevent the JIT compiler from generating any
  z13 instructions which may slightly degrade the performance of
  an average workload.
  

Problem summary

• If the `LOADxx MACHMIG VEF` load parameter is set at IPL time
  the user has requested to disable the VEF support in z/OS, as
  such the CVTVEF bit will not be enabled for the system. The JVM
  was not previously testing the CVTVEF flag for vector support
  and was executing vector instructions when the user has disabled
  them. This causes a SIGFPE on first execution of any vector
  instruction.
  

Problem conclusion

• The JVM has been updated to check the CVTVEF bit.
  .
  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