IV81897: CRASH IN JIT COMPILED CODE OR VM ON X86

APAR status

• Closed as program error.

Error description

• Error Message: JVMCDRT000E Unable to locate JIT stack map -
  aborting VM
  JVMCDRT001E Method:
  000003c5
  org/eclipse/mat/tests/SameHash.hash(I)Ljava/lang/String;
  (@000007FEC7E06FED)
  00000019
  org/eclipse/mat/tests/SameHash.main(<OSB>Ljava/lang/String;)V
  or
  Unhandled exception
  Type=Segmentation error vmState=0x00040000
  J9Generic_Signal_Number=00000004 ExceptionCode=c0000005
  .
  Stack Trace: N/A
  .
  

Local fix

• This problem can be worked around by using
  -Xjit:disableLoopUnroller,disableGLU option in the Java command.
  This option can also be applied to a specific method to reduce
  the impact on performance,
  -Xjit:{failingMethod}(disableLoopUnroller,disableGLU)
  

Problem summary

• The crash happens because the JIT compiler generates an
  optimized version of Java/lang/String.hashCode()I which if is
  called inside a loop would corrupt a loop invariant variable.
  

Problem conclusion

• The jit has been updated to generate the correct assembly
  sequence that will not corrupt the loop invariant variable.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR3 (8.0.3.0)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP