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Problem Report 1564 Details

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Report 1564 Actions

    Problem Report Number 1564
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0846
    Raised 2001-10-30 08:00
    Updated 2003-03-13 08:00
    Published 2001-11-08 08:00
    Product Standard Internationalised System Calls and Libraries Extended (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSU version 5.1.2
    Test Identification CAPI.os/jump/makeconte 1
    Problem Summary TSD4U.00307 The test may fail on systems where the amount of stack space it allocates is insufficient.
    Problem Text
    The SIGKILL signal is sent at this point in the test because the stack is full.

    The problem is that the stack used in the context modified by the
    makecontext() call is too small on this release of our product.

    The stack size is set by the following line of code in the testcase:
    ucp.uc_stack.ss_size = MINSIGSTKSZ;

    On page 554, The 'System Interfaces and Headers' Specification defines
    SIGSTKSZ and MINSIGSTKSZ as:

    "The value SIGSTKSZ is a system default specifying the number of bytes
    that would be used to cover the usual case when manually allocating an
    alternate stack area"

    "The value MINSIGSTKSZ is defined to be the minimum stack size for a
    signal handler. In computing an alternate signal stack size, a
    program should add that amount to its stack requirements to allow for
    the system implementation overhead."


    In our release 10 implementation, system overhead has increased and
    MINSIGSTKSZ is not big enough.

    The constant SIGSTKSZ is a better choice for the size of this stack
    and is in keeping with the definitions from the spec.

    Making that change in the testcase:
    ucp.uc_stack.ss_size = SIGSTKSZ;

    causes it to PASS on our R10 implementation as demonstrated in the
    following journal:

    1:13:22|IC Start
    13:22|TP Start
    33620136 1 1|TEST: makecontext() modifies context specified by ucp
    33620136 1 2|PREP: Generate a new context
    33620136 1 3|PREP: Allocate stack space
    33620136 1 4|TEST: Call makecontext
    33620136 1 5|TEST: Execution continues with func after setcontext()
    33620136 1 6|TEST: Parameters passed correctly after setcontext
    33620136 1 7|PREP: Generate another new context
    33620136 1 8|PREP: Allocate stack space
    33620136 1 9|TEST: Call makecontext
    33620136 1 10|TEST: Execution continues with func after swapcontext()
    33620136 1 11|TEST: Parameters passed correctly after swapcontext
    33620136 1 12|CLEANUP: Set original context
    1:13:22|PASS
    1:13:22|IC End
    Test Output
    IC Start
    TP Start
    3 1 1|TEST: makecontext() modifies context specified by ucp
    3 1 2|PREP: Generate a new context
    3 1 3|PREP: Allocate stack space
    3 1 4|TEST: Call makecontext
    3 1 5|TEST: Execution continues with func after setcontext()
    3 1 6|TEST: Parameters passed correctly after setcontext
    3 1 7|PREP: Generate another new context
    3 1 8|PREP: Allocate stack space
    3 1 9|TEST: Call makecontext
    3 1 10|TEST: Execution continues with func after swapcontext()
    3 1 11|TEST: Parameters passed correctly after swapcontext
    3 1 12|CLEANUP: Set original context
    4 2 1|ERROR: TEST TERMINATED DUE TO SIGKILL SIGNAL (9)
    FAIL

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This is accepted as a fault in the test suite.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion
    This is an agreed Test Suite Deficiency.

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