IV19226: CRASH IN JIT-COMPILED CODE ON Z196

APAR status

• Closed as program error.

Error description

• Error Message: The Java virtual machine (JVM) crashes with a
  SIGSEGV (or S0C4 ABEND) while attempting to load a class, or
  load a value from an object, within a JIT-compiled method. This
  only happens with Java 6.0.1 or Java 7 on a z196 system.
  .
  Stack Trace: When the ABEND occurs during class loading, the
  native call stack is as follows:
  .
  SENDLOADCLASS+0x835ca090
  callLoadClass+0x835b39c8
  arbitratedLoadClass+0x835b2548
  internalFindClassUTF8+0x835b0c48
  internalFindClassString+0x835af6c0
  SENDLOADCLASS+0x835ca090
  callLoadClass+0x835b39c8
  arbitratedLoadClass+0x835b2548
  internalFindClassUTF8+0x835b0c48
  resolveStaticMethodRef+0x8355c7b0
  RUNJAVATHREAD+0x835cd978
  javaProtectedThreadProc+0x83545108
  j9sig_protect+0x836d1d90
  javaThreadProc+0x83542598
  thread_wrapper+0xefa50ad8
  .
  If the JIT-compiled code is loading a value from an object,
  the instruction that causes the ABEND typically tries to load
  from a register that has been corrupted by an earlier LFH
  instruction, e.g.
  .
  E320 2008 00CA    LFH R2,8(,R2)
  .
  

Local fix

• The -Xjit:disableHighWordRA,disableHighWordGRA option will
  work around the problem.
  

Problem summary

• The problem is caused by an issue in the high-word register
  allocator which result in incorrect register spills and reloads
  in the JIT-compiled code.
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 SR2
  7.0.0 SR1
  .
  The JIT compiler has been updated to fix the register allocation
  algorithm.
  

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

• R260 PSY

     UP