LI77247: INCORRECT DEBUG INFORMATION CORRUPTS DEBUGGER

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • 12.1.0.2 PTF for XL C/C++ for BG/Q compiler generates the
    following  debug information and crashes debugger.
    <cd>   DW_AT_artificial  : 1
    <ce>   DW_AT_external    : 1
    <cf>   DW_AT_frame_base  : 1 byte block: 6f
    (DW_OP_reg31)
    <d1>   DW_AT_type        : 0x0 0x199
    <d9>   DW_AT_MIPS_linkage_name: _ZN6<nevermind>_
    These DWARF attributes are invalid according to the DWARF
    specification.
    Issue was only seen with -qsmp=noopt option.
    

Local fix

  • Use 12.1.0.1 PTF or remove -qsmp=noopt option.
    

Problem summary

  • PROBLEM DESCRIPTION: Incorrect debug information crashing
    Totalview debugger
    
    USERS AFFECTED: BG/Q compiler users compiling invoking high
    level optimizer component.
    

Problem conclusion

  • CONCLUSION: Uninitialized value for the block id is causing the
    compiler to emit bad debug opcodes.  This bad wcode is also
    causing the compiler to generate bad debug info and crashing
    the debugger.
    The fix is to initialize this value to 0 in the construction of
    generating REC opcodes.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77247

  • Reported component name

    XL C/C++ FOR BG

  • Reported component ID

    5799AG100

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-02-28

  • Closed date

    2013-09-11

  • Last modified date

    2013-09-11

  • 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

    XL C/C++ FOR BG

  • Fixed component ID

    5799AG100

Applicable component levels

  • RC10 PSY

       UP



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Document information


More support for:

XL C/C++ for Blue Gene/Q
Compiler

Software version:

12.1

Reference #:

LI77247

Modified date:

2013-09-11

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