IV58522: JVM TI CRASH WHEN ITERATING OVER PARTIALLY ALLOCATED STRING.

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: Unhandled exceptionType=Segmentation error
  vmState=0x00000000J9Generic_Signal_Number=00000004
  Signal_Number=0000000b Error_Value=4e4d9c80
  Signal_Code=00000001Handler1=000003FFFC9BDEBC
  Handler2=000003FFFC8D98A8
  InaccessibleAddress=0000000000000000gpr0=0000000000000000
  gpr1=000003FFF8906F30 gpr2=000003FFF8906F30
  gpr3=000003FFFC7EA030gpr4=000003FFFC15FA68 gpr5=000003FFFCAA6288
  gpr6=0000000000000000 gpr7=000003FFFC8C492Cgpr8=0000000000000000
  gpr9=000003FFFCAA82B8 gpr10=000003FFFD4A9070
  gpr11=0000000000000000gpr12=0000000000000000
  gpr13=000003FFFC19A638 gpr14=000003FFFC15FA68
  gpr15=000003FFFD4A7EA0psw=000003FFFC15FA7C mask=0705E00180000000
  fpc=0008000000000000 bea=000003FFFC8C4B74fpr0 4104000000000000
  (f: 0.000000, d: 1.638400e+05)fpr1 41bfc00000000000 (f:
  0.000000, d: 5.326766e+08)fpr2 4f00000000000000 (f: 0.000000, d:
  3.533694e+72)fpr3 402d66a7305e8faf (f: 811503552.000000, d:
  1.470049e+01)fpr4 419f000000000000 (f: 0.000000, d:
  1.300234e+08)fpr5 3ed9f750d64e7e4f (f: 3595468288.000000, d:
  6.190795e-06)fpr6 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr7 402d66a800191661 (f: 1644129.000000, d:
  1.470050e+01)fpr8 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr9 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr10 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr11 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr12 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr13 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr14 0000000000000000 (f: 0.000000, d:
  0.000000e+00)fpr15 0000000000000000 (f: 0.000000, d:
  0.000000e+00)Module=/j9vm/ascii/builds/bld_184668/sdk/xz6470_27/
  jre/lib/s390x/compressedrefs/libj9jvmti27.soModule_base_address=
  000003FFFC148000Target=2_70_20140124_184067 (Linux
  2.6.32-279.31.1.el6.s390x)CPU=s390x (2 logical CPUs) (0x7d143000
  RAM)----------- Stack Backtrace -----------(0x000003FFFC15FA7C
  <OSB>libj9jvmti27.so+0x17a7c<CSB>)(0x000003FFFC160BA0
  <OSB>libj9jvmti27.so+0x18ba0<CSB>)(0x000003FFFC32DD58
  <OSB>libj9gc27.so+0x2bd58<CSB>)(0x000003FFFC32DF22
  <OSB>libj9gc27.so+0x2bf22<CSB>)(0x000003FFFC32DFAA
  <OSB>libj9gc27.so+0x2bfaa<CSB>)(0x000003FFFC32BC30
  <OSB>libj9gc27.so+0x29c30<CSB>)(0x000003FFFC32BCB8
  <OSB>libj9gc27.so+0x29cb8<CSB>)(0x000003FFFC32B6BE
  <OSB>libj9gc27.so+0x296be<CSB>)(0x000003FFFC32B798
  <OSB>libj9gc27.so+0x29798<CSB>)(0x000003FFFC32B60E
  <OSB>libj9gc27.so+0x2960e<CSB>)(0x000003FFFC32B75A
  <OSB>libj9gc27.so+0x2975a<CSB>)(0x000003FFFC15F27A
  <OSB>libj9jvmti27.so+0x1727a<CSB>)Java_javasoft_sqe_tests_vm_jvm
  ti_itrh001_itrh00110_itrh00110_doCheck+0xaa (0x000003FFE51285DE
  <OSB>libjckjvmti.so+0x815de<CSB>)(0x000003FFFC9D583A
  <OSB>libj9vm27.so+0xa983a<CSB>)---------------------------------
  ------
  .
  

Local fix

Problem summary

• The problem was caused when JVM TI iterator tried to return
  string value of partially allocated string.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     7 R1 SR1       (7.1.1.0)
     6 R1 SR8       (6.1.8.0)
  .
  The JVM TI has been updated to prevent the crash from occurring
  when it iterates over heap that contains partially allocated
  strings.
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

     UP

• R260 PSY

     UP