PM75949: ABEND0C4 - 00000010 CMQXRLUF +03A5A

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Ø
  ABEND0C4 in CMQXRLUF +03A5A occurs followed by messages in
  joblog; ie. +CSQX112E CSQXDISP Dispatcher process error,
  ,TCB=tcbaddr reason=0C4000-00000010
  +CSQX599E CSQXRESP Channel channel_name ended abnormally
  +CSQX053E CSQXFFST Error information recorded in CSQSNAP data
  set
  
  The problem occurs when an XA CLOSE is received
  while the thread still has some queue handles open.
  In this situation, the handles are not closed, and
  when the thread control blocks (ACE) get reused it
  may try and post an ECB associated with the handle
  from the old thread.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version7  *
  *                 Release 1 Modification 0                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 0C4 in CMQXRLUF when an XA_CLOSE  *
  *                      is issued for a thread which still has  *
  *                      open handles.                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Issuing an XA_CLOSE will no longer cause CSQVDLC to be invoked
  in order to deallocate the thread's resources in CSQMCPRH.
  Subsequently the ACE is put on the MCLB freechain ready to
  be reused. When the ACE gets reallocated CSQM1P1W might
  be issued to post its ECB, which will be associated with the
  old thread's handle. If the associated storage has been
  reused then various abends may occur.
  

Problem conclusion

• CSQMCPRH has been changed to issue a CSQVDLC on the thread
  in response to an XA_CLOSE command, freeing up its resources.
  100Y
  CSQMCPRH
  

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:

  UK91446

Modules/Macros

• CSQMCPRH
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UK91446

     UP13/03/01 P F302

Fix is available

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