IV01848: GPF IN THE JIT DLL DURING JIT COMPILATION

APAR status

• Closed as program error.

Error description

• Error Message: Observed Result:
  ****************
       <OSB>java<CSB> Unhandled exception
       <OSB>java<CSB> Type=Segmentation error vmState=0x00000000
       <OSB>java<CSB> J9Generic_Signal_Number=00000004
  Signal_Number=0000000b Error_Value=00000000 Signal_Code=00000001
       <OSB>java<CSB> Handler1=00002AAAAACF2970
  Handler2=00002AAAAB098D70 InaccessibleAddress=0000000000000023
       <OSB>java<CSB> RDI=00002AAAAEAFEED0 RSI=0000000016783E00
  RAX=0000000000000000 RBX=0000000000000018
       <OSB>java<CSB> RCX=0000000000000000 RDX=00000000FFFFFFFE
  R8=0000000041905AA0 R9=0000000000000000
       <OSB>java<CSB> R10=0000000000000000 R11=0000000000200246
  R12=00002AAAB31F4C64 R13=0000000000000077
       <OSB>java<CSB> R14=00002AAAAEAFEED0 R15=00002AAAB31F1854
       <OSB>java<CSB> RIP=00002AAAAC9C0769 GS=0000 FS=0000
  RSP=0000000041905D40
       <OSB>java<CSB> EFlags=0000000000210246 CS=0033
  RBP=0000000000000003 ERR=0000000000000006
       <OSB>java<CSB> TRAPNO=000000000000000E
  OLDMASK=0000000000000000 CR2=0000000000000023
       <OSB>java<CSB> xmm0 40b53c0000000000 (f: 0.000000, d:
  5.436000e+03)
       <OSB>java<CSB> xmm1 4034800040400000 (f: 1077936128.000000,
  d: 2.050000e+01)
       <OSB>java<CSB> xmm2 406ec00000000000 (f: 0.000000, d:
  2.460000e+02)
       <OSB>java<CSB> xmm3 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm4 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm5 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm6 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm7 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm8 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm9 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm10 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm11 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm12 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm13 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm14 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB> xmm15 0000000000000000 (f: 0.000000, d:
  0.000000e+00)
       <OSB>java<CSB>
  Module=/tmp/pxa6460_26/ibm-java-x86_64-60/jre/lib/amd64/balanced
  cr/libj9jit26.so
       <OSB>java<CSB> Module_base_address=00002AAAAC8D8000
       <OSB>java<CSB> Target=2_60_20110217_075924 (Linux
  2.6.24-19-generic)
       <OSB>java<CSB> CPU=amd64 (4 logical CPUs) (0xbd036000 RAM)
  .
  Stack Trace: Relevant stack trace:
  #12 in TR_CHTable::cleanupNewlyExtendedInfo(TR_Compilation*) ()
  #13 in TR_CompilationInfoPerThreadBase::compile(J9VMThread*,
  TR_MethodToBeCompiled*, bool) ()
  #14 in protectedCompilationThreadProc(J9PortLibrary*,
  TR_CompilationInfoPerThread*) ()
  .
  

Local fix

• The problem does not show if the user disables optimizations
  based on class hierarchy table
  -Xjit:disableCHOpts
  This solution is expected to slightly degrade throughput of
  applications
  Another workaround is to disable dynamic class unloading with
  -Xnoclassgc
  This solution may increase the memory footprint (possibly
  leading to OutOfMemory errors) if the application is relying
  heavily on dynamically generated classes that are subsequently
  unloaded.
  

Problem summary

• The problem may appear when the JIT is doing some cleanup over
  the class hierarchy table (at the end of a compilation) and one
  of the classes from the class hierarchy table has been unloaded
  during the compilation.
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 GA FP1
  .
  The JIT has been modified to avoid accessing classes that have
  been unloaded (during the JIT compilation)
  .
  To obtain the fix:
  Install build 20110227 or later
  

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

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