PM17787: CRASH IN JIT_MEM_ALLOC

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Crash with SEGFAULT. Customer reports that this
    problem occurs when a particular method gets JIT compiled.
    .
    Stack Trace: 705C8A66  at  jitc.dll  _jit_mem_alloc + 0056
    705C958F  at  jitc.dll  _jit_code_mem_alloc + 001F
    705FA544  at  jitc.dll  _create_sp_offset_info + 00F4
    705CCFC8  at  jitc.dll  _JITGenNativeCode_state + 07C3
    70499A0F  at  jitc.dll  _JITGenNativeCode + 10EF
    704722B1  at  jitc.dll  _jit_compiler_entry + 0C51
    704735EC  at  jitc.dll  __jit_fast_compile + 026C
    706400EB  at  jitc.dll  __gate_code + 004B
    .
    NA
    

Local fix

  • NA
    

Problem summary

  • Crash with SEGFAULT. Customer reports that this problem occurs
    when a particular method gets JIT compiled.
    

Problem conclusion

  • This defect will be fixed in:
    1.4.2 SR13 FP6
    .
    The crash occured in the code generation phase of the JIT
    compilation of the customer's method, which has quite many
    number of StringBuffer's constructor and append methods inlined
    into it. The codegen is a dual pass routine, in the first pass,
    compiler runs through the optimized bytecode and estimates the
    size of the native code buffer to be allocated, and in the
    second pass, actual code is generated into the code buffer which
    is allocated based on the size information obtained from pass 1.
    Due to an error in the size computation logic, the generated
    code size becomes more than the estimated size, and overflows
    into the memory allocation structures. Next time when an
    allocation request was issued, the corrupted data structures
    caused the crash. The issue is fixed in latest SDK.(SR13 FP6)
    .
    To obtain the fix:
    Install build 20100909 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM17787

  • Reported component name

    JAVA(1.3/1.4 CO

  • Reported component ID

    5648C9800

  • Reported release

    42A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-05

  • Closed date

    2010-09-08

  • Last modified date

    2010-09-08

  • 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

    JAVA(1.3/1.4 CO

  • Fixed component ID

    5648C9800

Applicable component levels

  • R42A PSN

       UP

  • R42L PSN

       UP

  • R42W PSN

       UP

  • R420 PSN

       UP



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Document information


More support for:

z/OS family

Software version:

1.4.2

Reference #:

PM17787

Modified date:

2010-09-08

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