IJ27137: AN ASSERT IN PPCBINARYENCODING.CPP MAY TRIGGER WHEN RUNNING WITH TRAPS DISABLED ON POWER

APAR status

• Closed as program error.

Error description

• Error Message: An assert message of the form "Instruction ...
  <OSB>cmplwi<CSB> (generated from node ... <OSB>BNDCHK<CSB>): ...
  is out-of-range for UI field" will be printed and cause the JVM
  to crash.
  .
  Stack Trace: +0x1c8
  +0xd24
  +0x1a8
  +0x670
  +0x4a8
  +0x2b0
  +0x42c
  +0x195c
  +0x107c
  +0x1f84
  +0x84c
  +0xa24
  +0x700
  +0x148
  +0x400
  +0x608
  +0x56c
  +0x22c
  _pthread_body+0x120
  +0x0
  .
  This issue only occurs when either the -Xrs option is specified
  or the noResumableTrapHandler option is specified in the -Xjit
  options on Power.
  

Local fix

• This crash can be avoided by removing the -Xrs option or
  removing noResumableTrapHandler from the -Xjit options.
  

Problem summary

• During generation of code for array access bounds checks, the
  range of an immediate was erroneously validated to be a 16-bit
  signed integer when used in an instruction expecting a 16-bit
  unsigned integer.
  

Problem conclusion

• The JIT has been updated to perform the correct range check when
  generating code for a bound check when traps are disabled.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR6 FP16 (8.0.6.16)
  .
  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