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PI52895: WMQ ABEND0C4 CMQXRSRV

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Change Team finds this issue occurs when the number of bytes
    sent and received on an SSL client channel exceed the secret
    key reset count (SSLKeyResetCount) In this situation
    rriSecureFlowKeyReset may release the transmission buffer,
    although it is still being used by rriMQIServerCall and hence
    the abend occurs.
    

Local fix

  • Disable secret key renegotiation. Refer to Knowledge Center
    topic sy11000_ for direction on this.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ Version 8          *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Client application using a SVRCONN      *
    *                      channel configured with SHARECNV(0) and *
    *                      SSL/TLS generates abend 0C4 in CMQXRSRV *
    *                      and CHIN joblog shows message CSQX112E. *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    rriMQIServerCall processes MQGET calls on behalf of client
    applications. If a client application is connected using a
    SSL/TLS SVRCONN with SHARECNV(0) and rriMQIServerCall detects
    that it is time to reset the SSL session key then it invokes
    rriSecureFlowKeyReset function to negotiate the new SSL key. In
    some cases, rriSecureFlowKeyReset reuses a receive buffer that
    is in use by rriMQIServerCall causing the 0C4 abend on CMQXRSRV.
    

Problem conclusion

  • rriSecureFlowKeyReset has been changed to save the caller's
    buffers on entry and restore them on exit to avoid the 0C4
    abend.
    000Y
    CSQXRSSQ
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI52895

  • Reported component name

    WMQ Z/OS 8

  • Reported component ID

    5655W9700

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-11-20

  • Closed date

    2015-12-11

  • Last modified date

    2016-02-01

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

    PI48284

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

    UI33698

Modules/Macros

  • CSQXRSSQ
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI33698

       UP16/01/08 P F601

Fix is available

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Document Information

Modified date:
01 February 2016