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IT28621: MQ reports AMQ9620E error 5 in function gsk_secure_soc_read

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APAR status

  • Closed as program error.

Error description

  • MQ client SSL/TLS connection ends unexpectedly.
    .
    The AMQError logs for the queue manager report:
    .
    AMQ9620E: Internal error on call to SSL function on channel
    'TEST.CHANNEL'
    to host 'hostname' (xx.xx.xx.x)'.
    .
    EXPLANATION:
    An error indicating a software problem was returned from a
    function which is used to provide SSL or TLS support.
    The error code returned was '5'.
    The function call was 'gsk_secure_soc_read'.
    .
    The channel is 'TEST.CHANNEL'; in some cases its name cannot
    be determined and so is shown as '????'.
    The channel did not start.
    .
    The remote host name is 'hostname(xx.xx.xx.x)'.
    
    This error is seen after applying the fix for APAR IT23436,
    which describes the same problem.
    

Local fix

  • Turn off SSL key resets: ie set SSLRKEYC(0)
    Setting SSLRKEYC(0) may expose some cypherspec's keys to being
    compromised this should be used with caution.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    MQ versions 8.0.0.10+ or 9.0.0.4+ with MCA channels between
    LINUX/UNIX and z/OS -based queue managers using SSL with IT23436
    applied
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A coding error in the fix for IT23436 allowed a very small
    timing window to exist where a channel connection may end
    unexpectedly during the handling of a co-incident SSL Key reset
    packet and an EWOULDBLOCK event on the TCP socket. The problem
    would occur specifically during setting of the errno while
    handling the SSL Key reset packet .
    

Problem conclusion

  • The coding error has been corrected to appropriately set the
    errno value.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.13
    v9.0 LTS   9.0.0.8
    v9.1 CD    9.1.3
    v9.1 LTS   9.1.0.3
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT28621

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-03-31

  • Closed date

    2019-07-04

  • Last modified date

    2019-07-04

  • 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

    IBM MQ BASE M/P

  • Fixed component ID

    5724H7261

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
04 July 2019