PJ41377: SNAP 64915 ON SUBSYSTEM RESTART.

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APAR status

  • Closed as program error.

Error description

  • See Problem Summary
    

Local fix

  • n/a
    

Problem summary

  • APAR NUMBER:  PJ41377
    PRODUCT:  z/TPF
    FUNCTIONAL AREA:  LOADERS
    SHIPPED IN PUT:  10
    ABSTRACT:
    SNAP 64915 can occur in an MDBF environment.
    PACKAGE CONTENTS:
    Source Segments:
    (C) base/cp/cceh.cpy
    
    Object Only Binaries:
    None.
    
    Configuration Independent Binaries:
    None.
    
    Support Files:
    None.
    
    OTHER BINARIES TO BUILD: YES
    (C) <sys>/obj/ccenbk.o
    (C) <sys>/load/CPS0.so
    COMMENTS:
    The problem occurs in an MDBF environment, if an ECB running on
    a non-BSS subsystem causes the fetch of a subsystem shared
    program:
    Fetch processing is called with the PAT slot of the program
    being fetched, and uses PATFA to find the SEQN record. After
    that, whenever it is necessary to do a FACZC to calculate a
    file address for a #XPRGn or #OLDn record, the program base (n)
    is obtained from the PAT, but the SSID of the ECB is used in
    the CINFC call to obtain the address of the PAT. So fetch looks
    at the non-BSS PAT and gets the program base of the non-BSS
    image, as opposed to the program base of the BSS image.
    If the program bases are different and the contents of the
    program bases are different, an error will occur. If the
    SS-shared program is on a NEEDED list, a SNAP 64915 will occur.
    If doing a ZDMAP from the SS on a SS-shared program, a GETPC
    error will occur.
    

Problem conclusion

  • SOLUTION:
    There are six locations in fetch processing in CCEH where a
    CINFC is done using the ECBs SSID in order to obtain the PAT
    address or, in one case, to issue a CONKC for throttling. All
    six locations have been modified to use the SSID from the PAT
    slot of the program being fetched.
    COREQS: NO
    None.
    MIGRATION CONSIDERATIONS: NO
    None.
    BUILD COMMANDS AND INSTRUCTIONS: YES
    #maketpf commands for linux
    maketpf -f CPS0 ccenbk.o
    maketpf CPS0 link
    UPDATED INFORMATION UNITS: NO
    None.
    See your IBM representative if you need additional information.
    DOWNLOAD INSTRUCTIONS:
    http://www.ibm.com/software/htp/tpf/maint/maintztpf.html
    APAR URL:
    http://www.ibm.com/software/htp/tpf/ztpfmaint/put10/PJ41377.htm
    

Temporary fix

Comments

APAR Information

  • APAR number

    PJ41377

  • Reported component name

    Z/TPF

  • Reported component ID

    5748T1501

  • Reported release

    110

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-07-10

  • Closed date

    2013-09-25

  • Last modified date

    2013-10-07

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Modules/Macros

  •    None
    None
    

Fix information

  • Fixed component name

    Z/TPF

  • Fixed component ID

    5748T1501

Applicable component levels

  • R110 PSY

       UP



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Document information


More support for:

TPF
z/TPF

Software version:

110

Reference #:

PJ41377

Modified date:

2013-10-07

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