IV26971: SEGMENTATION ERROR DURING JIT COMPILATION

APAR status

• Closed as program error.

Error description

• Error Message: The crash should report a vmState starting with
  0x0005, probably 0x000565ff.
  Here is an example:
  Unhandled exception
  Type=Segmentation error vmState=0x000565ff
  J9Generic_Signal_Number=00000004 Signal_Number=0000000b
  Error_Value=00000000 Signal_Code=00000001
  Handler1=00000400009F67F0 Handler2=0000040000AEDC48
  R0=0000000000000000 R1=0000040011119A40 R2=0000040001CD3790
  R3=000004001465E638
  R4=0000000000000000 R5=0000040011119CC0 R6=000004000FAE2C80
  R7=00000000003FC200
  R8=000000000001FD40 R9=0000000000000100 R10=0000000000000009
  R11=0000000000000000
  R12=0000000000000058 R13=0000040011126910 R14=0000000000000001
  R15=0000000000000000
  R16=000000000000000C R17=000004002889E558 R18=0000040029D6E588
  R19=0000040029D786E4
  R20=00000400284DFDE8 R21=0000040028F5D4C0 R22=0000040001C3D728
  R23=0000040001C19000
  R24=0000040001C19990 R25=00000000FFFFFFFF R26=0000040050BC3C88
  R27=000000003C545910
  R28=000004001467E378 R29=000004001465EAC5 R30=0000000000000001
  R31=000004001465EAC4
  NIP=00000400012CBA60 MSR=800000000280F032
  ORIG_GPR3=0000000000000000 CTR=00000400012BCC60
  LINK=00000400012CBA28 XER=0000000000000001 CCR=0000000088242288
  SOFTE=0000000000000001
  TRAP=0000000000000300 DAR=0000040050BC3C88
  dsisr=0000000040000000 RESULT=0000000000000000
  FPR0 3fe51eb860000000 (f: 1610612736.000000, d: 6.600000e-01)
  FPR1 3ff6666666666666 (f: 1717986944.000000, d: 1.400000e+00)
  FPR2 409c700000000000 (f: 0.000000, d: 1.820000e+03)
  FPR3 40bd4c0000000000 (f: 0.000000, d: 7.500000e+03)
  FPR4 0000000000000005 (f: 5.000000, d: 2.470328e-323)
  FPR5 4330080000000000 (f: 0.000000, d: 4.512396e+15)
  FPR6 4148000000000000 (f: 0.000000, d: 3.145728e+06)
  FPR7 c3dfffffffffff83 (f: 4294967296.000000, d: -9.223372e+18)
  FPR8 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR9 0000040001deb200 (f: 31371776.000000, d: 2.172939e-311)
  FPR10 0000040001deb1f0 (f: 31371760.000000, d: 2.172939e-311)
  FPR11 0000040001deb1e0 (f: 31371744.000000, d: 2.172939e-311)
  FPR12 0000040001deb1d0 (f: 31371728.000000, d: 2.172939e-311)
  FPR13 0000040001dec5a0 (f: 31376800.000000, d: 2.172939e-311)
  FPR14 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR15 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR16 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR17 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR18 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR19 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR20 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR21 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR22 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR23 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR24 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR25 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR26 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR27 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR28 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR29 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR30 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  FPR31 0000000000000000 (f: 0.000000, d: 0.000000e+00)
  Module=/jtctest/sdk_installs/pxp6470sr1/pxp6470sr1-20120128_01/i
  bm-java-ppc64-70/jre/lib/ppc64/compressedrefs/libj9jit26.so
  Module_base_address=0000040001070000
  Method_being_compiled=org/apache/harmony/luni/tests/java/util/Ve
  ctorTest.test_ensureCapacityI()V
  Target=2_60_20120124_100504 (Linux 2.6.32.46-0.3-ppc64)
  CPU=ppc64 (16 logical CPUs) (0x3f9cd0000 RAM)
  .
  Stack Trace: N/A
  .
  

Local fix

• -Xjit:disableRedundantMonitorElimination
  

Problem summary

• The JIT made an incorrect assumption about its own internal
  representation of Java static string constants, erroneously
  interpreting one as a static field instead.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR14
  6.0.0 SR11
  .
  The JIT has been fixed to ensure that it is dealing with a
  static field, not a static string constant.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV26970

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R600 PSY

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