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PI52397: WMQ 7.1: CSQX053E FOR CCXALLOCMEM MAY OCCUR WHEN A LARGE MESSAGE IS GOTTEN BY A CLIENT CHANNEL THAT IS USING SSL/TLS

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Ø
    A client channel getting large messages with an SSL/TLS client
    sometimes receives reason code 2009 MQRC_CONNECTION_BROKEN. The
    problem occurs when the channel is communicating with a V7.1
    queue manager but not a V8.0 one.
    
    The CHIN joblog has messages
    
     CSQX053E Error information recorded in CSQSNAP data set
     CSQX501I Channel <channel name> no longer active
    
    The eyecatcher of the snap dump looks like
    
    *        X...XFFSccxAllocMem.....*
    *................MOVR......p.....*
    *X...XINS...:....................*
    *................Length..........*
    *................................*
    
    In the reported case, the client was running on a DataPower
    (DP) appliance, but the problem is not limited to DP.
    
    Additional Symptom(s) Search Keyword(s):
    XFFSccxAllocMem 7.1.0 SVRCONN SSL TLS FFST
    CSQX620E System SSL error function 'gsk_secure_socket_read'
             RC=437
    

Local fix

  • None unless the channel can temporarily run without SSL/TLS.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ Version 7          *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: MQ V7 client application using SSL      *
    *                      SVRCONN channels can receive MQRC 2009  *
    *                      (MQRC_CONNECTION_BROKEN) after MQGET.   *
    *                                                              *
    *                      The CHIN joblog reports error messages  *
    *                      CSQX053E and CSQX620E.                  *
    *                                                              *
    *                      In CSQSNAP dataset, FFST SNAP dumps are *
    *                      generated by function ccxAllocMem.      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Distributed MQ V7 clients do not negotiate with the queue
    manager the correct buffer size for SSL during channel
    initiation. This causes MQ V710 for z/OS channel initiator CHIN
    to try to allocate a SSL transmission buffer that is too large
    resulting in ccxAllocMem generating a FFST SNAP dump. The
    current MQGET call or any other active API call terminates with
    MQRC 2009 (MQRC_CONNECTION_BROKEN).
    

Problem conclusion

  • MQ V710 for z/OS channel initiator now enforces a maximum SSL
    buffer size avoiding the FFST SNAP dumps, error messages and
    unexpected reason codes on API calls.
    100Y
    CMQXRMSA
    CMQXRSRV
    CSQXCCMX
    CSQXRMSS
    CSQXRMTR
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI52397

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-11-12

  • Closed date

    2016-01-18

  • Last modified date

    2016-03-02

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

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

    UI34511

Modules/Macros

  • CMQXRMSA CMQXRSRV CSQXCCMX CSQXRMSS CSQXRMTR
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UI34511

       UP16/02/03 P F602

Fix is available

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Document Information

Modified date:
02 March 2016