PJ40690: FIX UNPLANNED MOD DOWN GETTING HUNG (FIX IN CPAD)

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APAR status

  • Closed as program error.

Error description

  • See Problem Summary.
    

Local fix

  • na
    

Problem summary

  • APAR NUMBER:  PJ40690
    PRODUCT:  z/TPF
    FUNCTIONAL AREA:  DASD MOUNT/DISMOUNT
    SHIPPED IN PUT:  10
    
    ABSTRACT:
    After PJ32026, unplanned module down can get hung due to
    infinite loop condition.
    
    PACKAGE CONTENTS:
    Source Segments:
    (C) base/rt/cpad.asm
    
    Object Only Binaries:
    None.
    
    Configuration Independent Binaries:
    (C) base/obj/cpad.o
    (C) base/load/CPAD.so
    
    Support Files:
    base/lst/cpad.lst
    base/lst/CPAD.map
    
    OTHER BINARIES TO BUILD: NO
    None.
    
    COMMENTS:
    Unplanned module down purges the module queue then calls
    dismount to dismount the module. Dismount checks the module
    queue and will wait for the module queue to be empty before
    proceeding. Unplanned module down freezes the module queue
    however causing an infinite loop if dismount finds an IOB on
    the queue. This can be found by a long running ECB that keeps
    issuing a DLAYC in CPAD.
    

Problem conclusion

  • SOLUTION:
    If unplanned module down is found to be calling dismount and
    the module queue is not empty, the module queue will be purged
    again instead of entering the DLAYC loop and waiting for an
    empty queue.
    
    COREQS: NO
    None.
    
    MIGRATION CONSIDERATIONS: NO
    None.
    
    BUILD COMMANDS AND INSTRUCTIONS: YES
    #maketpf commands for linux
    maketpf -f CPAD cpad.o
    maketpf CPAD 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/PJ40690.htm
    

Temporary fix

Comments

APAR Information

  • APAR number

    PJ40690

  • Reported component name

    Z/TPF

  • Reported component ID

    5748T1501

  • Reported release

    110

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-10-31

  • Closed date

    2012-11-28

  • Last modified date

    2012-11-28

  • 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

    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 #:

PJ40690

Modified date:

2012-11-28

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