IT30634: MQ FDC with probe ID XC130003 generated when disconnecting from queue manager

APAR status

• Closed as program error.

Error description

• Occasionally the following failure occurs on MQDISC:
  
  | Major Errorcode   :- STOP
                                                    |
  | Minor Errorcode   :- OK
                                                      |
  | Probe Type        :- HALT6109
                                                |
  | Probe Severity    :- 1
                                                       |
  | Probe Description :- AMQ6109: An internal WebSphere MQ error
  has occurred.  |
  | FDCSequenceNumber :- 0
                                                       |
  | Arith1            :- 11 (0xb)
                                                |
  | Comment1          :- SIGSEGV: address not mapped(0x2d1c)
                     |
  
  The function stack is as follows:
  
  MQM Function Stack
  MQDISC
  zstMQDISC
  zstMQCTLCommon
  zifQMgrInstruction
  zsqQMgrInstruction
  xcsFFST
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users with a fastpath applications calling MQDISC may be
  affected.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Occasionally an MQDISC call failed with FDC with probe ID
  XC130003 when another MQDISC call had already been made. A logic
  error meant that the second MQDISC call accessed a pointer to a
  control block, but that pointer could have already been cleared
  by the first MQDISC. This was observed in a Java JMS test
  application.
  

Problem conclusion

• The MQ code has been changed to avoid the illegal null pointer
  access. The second MQDISC call now returns with the expected
  MQRC_HCONN_ERROR.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.14
  v9.0 LTS   9.0.0.9
  v9.1 CD    9.1.5
  v9.1 LTS   9.1.0.5
  
  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 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 MP

• Fixed component ID

  5724H7251

Applicable component levels