IBM Support

IT29927: DEADLOCK BETWEEN MASTER REPMAN AND CHANNEL SERVER DURING MAINTENANCE

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APAR status

  • Closed as program error.

Error description

  • Queue manager gets unresponsive and even control commands
    get hung (amqrfdm, runmqsc, endmqm, amqrrmit, ...).
    Pstate on primary channel server shows it in "rfxConnectCache".
    Master repman shows in pstate outstanding I/O to the primary
    channel server.
    "endmqm -p" does not work!
    

Local fix

  • N/A
    

Problem summary

  • Due to fix for IT25666, queue manager gets trap in deadlock
    when a channel is deleted during the cluster cache maintenance,
    when the primary channel server is not running onthe sameCPU
    as the master repman.
    

Problem conclusion

  • Code was changed to avoid extended cluster cache lock in
    this maintenance phase.
    

Temporary fix

  • Run primary channel server on CPU 0 together with master repman.
    

Comments

APAR Information

  • APAR number

    IT29927

  • Reported component name

    WEBS MQ NSS ITA

  • Reported component ID

    5724A3902

  • Reported release

    531

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-08-09

  • Closed date

    2019-08-09

  • Last modified date

    2019-08-09

  • 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

    WEBS MQ NSS ITA

  • Fixed component ID

    5724A3902

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ5M","label":"APAR"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"5.3.1","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
09 August 2019