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Problem Report 1900 Details

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Report 1900 Actions

    Problem Report Number 1900
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0961
    Raised 2002-12-17 08:00
    Updated 2003-03-13 08:00
    Published 2002-12-17 08:00
    Product Standard Internationalised System Calls and Libraries Extended V2 (UNIX 98)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.5.3
    Test Identification POSIX.os/ioprim/fcntl 11,12,15,16,23
    Problem Summary TSD5.030 The test suite as coded expects that adjacent locks set by fcntl() are coalesced. One system does not coalesce locks. According to PASC Interpretation reference 1003.1-90 #50, either behavior conforms...
    Problem Text
    The test suite as coded expects that adjacent locks set by
    fcntl() are coalesced. One system does not coalesce locks.
    According to PASC Interpretation reference 1003.1-90 #50, either
    behavior conforms to POSIX.1. XPG4 adds no extended specifications
    on this point.

    This behavior has previously been approved for XPG3 in, for example,
    interpetation PG3.727

    _____________________________________________________________________________
    PASC Interpretation reference
    1003.1-90 #50
    Classification: No change


    This response will be incorporated in an IEEE interpretations
    publication, and will be also made available on-line on the IEEE
    SPAsystem.

    _____________________________________________________________________________


    Interpretation Number: (to be assigned by the IEEE)
    Topic: fcntl() locking
    Relevant Sections: 6.5.2.2


    Interpretation Request:
    -----------------------

    +Interpretation Request ref : VWG/008/063092
    [Problem description]
    fcntl() locking

    During the development of a test suite for ISO POSIX.1 the
    following question was raised with regard to the fcntl()
    function and coalescence of adjacent locks.

    [Request text starts] POSIX.1-1990 Section 6.5.2.2 fcntl() :

    Should adjacent locks be coalesced when F_GETLK is used to
    check for existence of locks?

    X/Open would propose that they should not be so:

    In fcntl(), page 107 line 161ff of the System Interfaces and
    headers document it says:

    "There will be at most one type of lock for each byte in
    the file. Before successfull return from an F_SETLK or
    an F_SETLKW request when the calling process has
    previously existing locks on bytes in the region
    specified by the request, the previous lock type for
    each byte in the specified region will be replaced by
    the new lock type."

    Meaning that if two locks for overlapping regions of a file
    are obtained by a single process, the region which overlaps
    will be owned by the new lock. Coalescing is not required.
    [text ends]
    (Josey-X/Open)

    IEEE Interpretation for 1003.1-1990 (9945-1:1990):
    --------------------------------------------------

    IEEE Std 1003.1-1990 does not specify whether there may be
    distinct overlapping locks for the same process or multiple
    locks of the same type on the same byte for the same process.

    It is unspecified, when multiple F_SETLK or F_SETLKW requests
    for the same lock type have been made by the same process that
    address a common extent in the file, whether multiple requests
    with F_UNLCK are necessary in order to unlock that common
    extent.

    Coalescing of locks is neither required nor prohibited. It
    would be conforming for an implementation to treat adjacent or
    overlapping locks of the same type for the same process as if
    they were coalesced immediately on creation.

    Rationale for Interpretation:
    -----------------------------

    The request exhibits some confusion between the concepts "one
    type of lock set for each byte" and "one lock set for each
    byte". POSIX.1 does not prohibit having more than one lock of
    the same type on the same byte of a file for the same process.

    The standard does not provide a handle by which an individual
    lock may be identified after it is set. This means that a
    process can identify a lock only by the values in the struct
    flock returned by an F_GETLK request. The standard does not
    require that the values returned by an F_GETLK request
    correspond exactly to an extent that was locked by a single
    F_SETLK or F_SETLKW request. The specification quoted in the
    request (that each byte in the file be affected by only one type
    of lock) can further obscure the identity of individual locks,
    since the creation of a new lock of a different type could cause
    an old lock to be truncated or to be divided into discontinuous
    extents. See B.6.5.2, page 271, lines 3661-3666.

    It is unspecified whether a process can use F_GETLK to identify
    its own locks. A strictly conforming application must cause the
    F_GETLK request to be made from a different process.
    _____________________________________________________________________________
    (c) 1994 The Institute of Electrical and Electronic Engineers, Inc.
    Not to be published without prior written permission of the IEEE.

    This problem is reported in the VSX Release notes and only affects a
    single system. This problem would require considerable changes in the
    user test set-up in order for a correction to be effective.
    Test Output
    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 11 Failed

    Test Description:
    For the XNFS specification:
    If the implementation supports file locking for files residing on
    a remote file system: On a call to fcntl(fildes, F_SETLK, arg)
    when l_type = F_RDLCK is specified a shared lock is created on the
    segment specified in arg.
    For the XSH specification:
    On a call to fcntl(fildes, F_SETLK, arg) when l_type = F_RDLCK is
    specified a shared lock is created on the segment specified in
    arg.
    Posix Ref: Component FCNTL Assertion 6.5.2.2-16(A)

    Test Strategy:
    OPEN pipes using opensync() - (genlib)
    OPEN new file using creat()
    WRITE 40 bytes to file
    CLOSE file and OPEN it again O_RDWR
    SEEK to offset 5 within the file
    CREATE process pair
    PARENT Process:
    SET lock {F_RDLCK, SEEK_SET, 5, 5, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 5,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 10, 5, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 10,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 10, 10, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 15,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 5, 20, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 20,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 20, 10, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 15,
    getppid()}
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    20, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 20, 10,
    getppid()}

    Test Information:
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 10
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 20
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    ************************************************************************

    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 12 Failed

    Test Description:
    For the XNFS specification:
    If the implementation supports file locking for files residing on
    a remote file system: On a call to fcntl(fildes, F_SETLK, arg)
    when l_type = F_WRLCK is specified an exclusive lock is created on
    the segment specified in arg.
    For the XSH specification:
    On a call to fcntl(fildes, F_SETLK, arg) when l_type = F_WRLCK is
    specified an exclusive lock is created on the segment specified in
    arg.
    Posix Ref: Component FCNTL Assertion 6.5.2.2-17(A)

    Test Strategy:
    OPEN pipes using opensync() - (genlib)
    OPEN new file using creat()
    WRITE 40 bytes to file
    CLOSE file and OPEN it again O_RDWR
    SEEK to offset 5 within the file
    CREATE process pair
    PARENT Process:
    SET lock {F_WRLCK, SEEK_SET, 5, 5, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 5,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 10, 5, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 10,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 10, 10, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 15,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 5, 20, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 20,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 20, 10, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 15,
    getppid()}
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    20, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 20, 10,
    getppid()}

    Test Information:
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 10
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 20
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    ************************************************************************

    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 15 Failed

    Test Description:
    For the XNFS specification:
    If the implementation supports file locking for files residing on
    a remote file system: On a call to fcntl(fildes, F_SETLKW, arg)
    when l_type = F_RDLCK is specified a shared lock is created on the
    segment specified in arg.
    For the XSH specification:
    On a call to fcntl(fildes, F_SETLKW, arg) when l_type = F_RDLCK is
    specified a shared lock is created on the segment specified in
    arg.
    Posix Ref: Component FCNTL Assertion 6.5.2.2-20(A)

    Test Strategy:
    OPEN pipes using opensync() - (genlib)
    OPEN new file using creat()
    WRITE 40 bytes to file
    CLOSE file and OPEN it again O_RDWR
    SEEK to offset 5 within the file
    CREATE process pair
    PARENT Process:
    SET lock {F_RDLCK, SEEK_SET, 5, 5, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 5,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 10, 5, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 10,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 10, 10, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 15,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 5, 20, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 20,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 20, 10, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 5, 15,
    getppid()}
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    20, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 20, 10,
    getppid()}

    Test Information:
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 10
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 20
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    ************************************************************************

    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 16 Failed

    Test Description:
    For the XNFS specification:
    If the implementation supports file locking for files residing on
    a remote file system: On a call to fcntl(fildes, F_SETLKW, arg)
    when l_type = F_WRLCK is specified an exclusive lock is created on
    the segment specified in arg.
    For the XSH specification:
    On a call to fcntl(fildes, F_SETLKW, arg) when l_type = F_WRLCK is
    specified an exclusive lock is created on the segment specified in
    arg.
    Posix Ref: Component FCNTL Assertion 6.5.2.2-21(A)

    Test Strategy:
    OPEN pipes using opensync() - (genlib)
    OPEN new file using creat()
    WRITE 40 bytes to file
    CLOSE file and OPEN it again O_RDWR
    SEEK to offset 5 within the file
    CREATE process pair
    PARENT Process:
    SET lock {F_WRLCK, SEEK_SET, 5, 5, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 5,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 10, 5, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 10,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 10, 10, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 20, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 15,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 5, 20, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 20,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 20, 10, 0} using fcntl(F_SETLKW)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    5, 25, 0} gives lock description {F_WRLCK, SEEK_SET, 5, 15,
    getppid()}
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    20, 25, 0} gives lock description {F_RDLCK, SEEK_SET, 20, 10,
    getppid()}

    Test Information:
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 10
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 20
    F_RDLCK not created/detected properly
    lock lengths differ: got 5 - expected 15
    ************************************************************************

    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 23 Failed

    Test Description:
    For the XNFS specification:
    If the implementation supports file locking for files residing on
    a remote file system: For any lock type the segment specification
    can be set to extend to end of file by setting l_len to zero.
    For the XSH specification:
    For any lock type the segment specification can be set to extend
    to end of file by setting l_len to zero.
    Posix Ref: Component FCNTL Assertion 6.5.2.2-29(A)

    Test Strategy:
    OPEN pipes using opensync() - (genlib)
    OPEN new file using creat()
    WRITE 40 bytes to file
    CLOSE file and OPEN it again O_RDWR
    SEEK to offset 5 within the file
    CREATE process pair
    PARENT Process:
    SET lock {F_WRLCK, SEEK_SET, 10, 0, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    20, 5, 0} gives lock description {F_WRLCK, SEEK_SET, 10, 0,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_WRLCK, SEEK_SET, 0, 0, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    20, 5, 0} gives lock description {F_WRLCK, SEEK_SET, 0, 0,
    getppid()}
    CREATE process pair
    PARENT Process:
    SET lock {F_RDLCK, SEEK_SET, 10, 0, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    20, 5, 0} gives lock description {F_RDLCK, SEEK_SET, 10, 0,
    getppid()}
    WRITE data to pipe using sendsync() - (genlib)
    PARENT Process:
    READ data from pipe using waitsync() - (genlib)
    SET lock {F_RDLCK, SEEK_SET, 0, 0, 0} using fcntl(F_SETLK)
    WRITE data to pipe using sendsync() - (genlib)
    CHILD Process:
    READ data from pipe using waitsync() - (genlib)
    VERIFY that fcntl(F_GETLK) with lock description {F_WRLCK, SEEK_SET,
    20, 5, 0} gives lock description {F_RDLCK, SEEK_SET, 0, 0,
    getppid()}

    Test Information:
    the whole file was not locked when l_len = l_start = 0
    lock start points differ: got 10 - expected 0
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This is an agreed Test Suite Deficiency.

    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.

    Problem Reporting System Options:

     

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