IV34232: SEGMENTATION FAULT IN LIBJ9JEXTRACT.SO

APAR status

• Closed as program error.

Error description

• Error Message: A segmentation fault occurs when running the
  sdk/jre/bin/jextract tool on a system dump. The segmentation
  fault is preceded by these messages:
  Unable to allocate debug scratch space (1024 MB).
  Try setting the J9DBGEXT_SCRATCH_SIZE environment variable to a
  smaller value.
  .
  Stack Trace: N/A
  .
  Typical output seen on stdout/stderr:
   Unhandled exception
    Type=Segmentation error vmState=0x00000000
    J9Generic_Signal_Number=00000004 Signal_Number=0000000b
  Error_Value=02229300 Signal_Code=00000001
    Handler1=0000020000B52444 Handler2=0000020000C147D4
  InaccessibleAddress=0000000000000000
    gpr0=0000000000000000 gpr1=0000000000000000
  gpr2=0000000000000018 gpr3=0000020000000002
    gpr4=000002000433A914 gpr5=0000020000AFAA18
  gpr6=00000000802B7B38 gpr7=0000000000000000
    gpr8=0000000000000018 gpr9=0000000000000000
  gpr10=000000008006BBB0 gpr11=0000000000000000
    gpr12=0000000000000000 gpr13=00000200043F2658
  gpr14=0000020004331E88 gpr15=0000020000AF8E88
    psw=0000020004331E90 mask=0705C00180000000
  fpc=0008000000000000
    ....
  
  Module=/j9vm/ascii/builds/bld_127621/sdk/xz6470/jre/lib/s390x/co
  mpressedrefs/libj9jextract.so
    Module_base_address=00000200042C3000
    Target=2_60_20121107_127621 (Linux 2.6.32.12-0.7-default)
    CPU=s390x (2 logical CPUs) (0x7d3d8000 RAM)
    ----------- Stack Backtrace -----------
    (0x0000020004331E90 <OSB>libj9jextract.so+0x6ee90<CSB>)
    (0x00000200043AAFA8 <OSB>libj9jextract.so+0xe7fa8<CSB>)
    (0x00000200043AD804 <OSB>libj9jextract.so+0xea804<CSB>)
    (0x00000200043A74DE <OSB>libj9jextract.so+0xe44de<CSB>)
    (0x00000200043A6976 <OSB>libj9jextract.so+0xe3976<CSB>)
    Java_com_ibm_jvm_j9_dump_extract_Main_doCommand+0x11c
  (0x00000200042D1670 <OSB>libj9jextract.so+0xe670<CSB>)
    (0x0000020000B748C0 <OSB>libj9vm26.so+0x408c0<CSB>)
    ---------------------------------------
  

Local fix

• The problem occurs when using the jextract tool in the 64-bit
  JVM, and when insufficient memory is available. Increase the
  available RAM, or adjust the J9DBGEXT_SCRATCH_SIZE environment
  variable as indicated by the message.
  

Problem summary

• The crash occurs occasionally, when jextract continues to run
  after the failure to obtain sufficient memory.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR4
  6.0.1 SR5
  .
  The jextract tool has been updated to terminate gracefully with
  error messages when insufficient memory is available.
  

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

• R260 PSY

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