PM65936: ONLINE CHANGE FOR ACBLIB WHILE DC MONITOR IS EXECUTING CAUSES AN S0C4 IN DFSMNTR0(PM16421)+X'12DC LABEL SL87030

A fix is available

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APAR status

  • Closed as program error.

Error description

  • An S0C4 occurs when the DC monitor is running and an online
    change for ACBLIB is done. DFSMNTR0 is processing a list of area
    DMACs. The problem is the code hit a part of the list where the
    DMAC storage has been freed and the list has not been updated
    with the new addresses. ABEND S0C4 in DFSMNTR0(PM16421)+x'12DC
    label SL87030.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: IMS Fast Path V11 users of ACB member        *
    *                 online change and IMS monitor utility.       *
    ****************************************************************
    * PROBLEM DESCRIPTION: If Online Change for ACBLIB is running  *
    *                      while IMS Monitor is running, an        *
    *                      ABENDS0C4 occurs.                       *
    ****************************************************************
    * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
    ****************************************************************
    When the IMS Monitor is running at the same time as online
    change for ACBLIB, an ABENDS0C4 can occur in DFSMNTR0. Module
    DBFOLC01 frees the DMAC storage during the online change path.
    
    There is a timing window after the DMAC storage has been freed
    by DBFOLC01 but before module DBFOLC02 rebuilds the arealist
    where module DFSMNTR0 for the IMS Monitor references the DMAC
    that has been freed. Its this window that exposes the potential
    for the ABEND0C to occur.
    
    This problem can occur while either Member OLC and/or OLC
    involving ACBLIB is running.
    
    
    Additional Keywords: DC Monitor DCMON IMSDCMON 0C4 S0C4
    

Problem conclusion

  • GEN:
    KEYWORDS:
    
    *** END IMS KEYWORDS ***
    Logic has been added to the following:
    
    DFSMNTR0: Logic has been added to acquire the DBFALOCK if it is
    available under conditional share mode. If DBFALOCK is not
    available, skip the DFSSLOG 87 call. If the latch is acquired,
    DBFALOCK is released after the DFSSLOG 87 call.
    
    DBFALOCK: Logic has been added for Conditional Share Mode. Under
    the conditional share mode, if the latch is available, get the
    latch. If the latch is not available, do not wait for it to be
    available and do not acquire the latch.
    
    For exclusive mode, get latch only if latch is not already
    owned by online change.
    
    DBFOLC01: Get DBFALOCK exclusive before we free DMCB in DMACs.
    
    DBFOLC02: Recompile to obtain the new changes added to DBFALOCK.
    
    DFSICV30: Logic was added to acquire the latch in DBFOLC15.
    
    DFSMOLS0: Logic was added to not acquire the latch in DBFOLC15.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM65936

  • Reported component name

    IMS V11

  • Reported component ID

    5635A0200

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-05-31

  • Closed date

    2013-09-13

  • Last modified date

    2013-10-04

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

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

    PM95132 UK97544 UK97545

Modules/Macros

  •    DBFALOCK DBFOLC01 DBFOLC02 DFSICV30 DFSMNTR0
    DFSMOLS0
    

Fix information

  • Fixed component name

    IMS V11

  • Fixed component ID

    5635A0200

Applicable component levels

  • R100 PSY UK97544

       UP13/09/18 P F309

  • R101 PSY UK97545

       UP13/09/18 P F309

Fix is available

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Document information


More support for:

IMS

Software version:

100

Reference #:

PM65936

Modified date:

2013-10-04

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