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VM66403: ABENDMCW002 DURING REPLACEMENT OF HBA CARD FOR DS8000

A fix is available

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APAR status

  • Closed as program error.

Error description

  • While running z/VM 7.1.0 on a z13 (2964) with DS8K DASD IBM
    was attempting to replace an HBA card on the DASD when
    all z/VM LPARs received an EMIFed CHPID error. z/VM LPARs
    running 7.1.0 RSU 1902 recovered without issue. However, the
    only LPAR running RSU 2001 (recently upgraded) took two
    ABENDMCW002 abends.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All z/VM users                               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    An attempt was made to replace an HBA card on a DS8000 DASD and
    an EMIFed CHPID error occurred.  Recovery of this CHPID error
    caused an ABENDMCW002.  A tight loop in this recovery where
    the VARY LOCK is obtained and released without any VARY DEVICE
    or VARY PATH actions occurring causes the ABENDMCW002 because
    the master processor is held busy with no loss of control for
    too long of a time.
    

Problem conclusion

  • ABENDMCW002 -
    CHPID recovery processing was modified to only obtain the VARY
    LOCK when it is known for sure that VARY device or VARY path
    processing will be called.  VARY device and VARY path processing
    allows for loss of control so that the master processor will not
    be held busy for too long of a time.  This will prevent the
    ABENDMCW002 from occurring.
    

Temporary fix

  • FOR RELEASE VM/ESA CP/ESA R640 :
    PREREQ: VM66309
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE VM/ESACP/ESAR710 :
    PREREQ: VM66309
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE VM/ESA CP/ESA R720 :
    PREREQ: NONE
    CO-REQ: NONE
    IF-REQ: NONE
    

Comments

APAR Information

  • APAR number

    VM66403

  • Reported component name

    VM CP

  • Reported component ID

    568411202

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-06-18

  • Closed date

    2020-10-08

  • Last modified date

    2021-08-18

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

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

    UM35751 UM35752 UM35753

Modules/Macros

  • HCPCIO
    

Fix information

  • Fixed component name

    VM CP

  • Fixed component ID

    568411202

Applicable component levels

  • R640 PSY UM35751

       UP20/10/15 I 1000 ¢

  • R710 PSY UM35752

       UP20/10/15 P 2101 ¢

  • R720 PSY UM35796

       UP20/12/08 P 2101 ¢

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
19 August 2021