PH38095: ABEND 0C4-00000038 IN CSQWVCOL+0000060A

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABN=0C4-00000038,U=SYSOPR,C=MQ900.920.IFC-CSQWTRC,M=CSQVEUS3,
  LOC=CSQWDLD2.CSQWVCOL+00000634
  
  The abend has occurred when attempting to build a trace entry
  for a newly created EB.
  
  When EB was created, it attempted to get a THTR block to use
  for trace, however none were available on the free chain
  and so it obtained one from the PHB.
  When the EB subsequently attempted to build the trace entry, it
  checked if it had been allocated a tseg yet, and if not would
  have obtained one.
  
  However, the tseg pointer contained a residual value, causing an
  invalid address to be used to locate the tseg, and leading to
  the abend when trying to access the tseg using it.
  

Local fix

• The abend only occurs when running with internal trace enabled,
  and so stopping internal trace should prevent any reoccurrence
  of this problem.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 in CSQWVCOL after the QMGR     *
  *                      internal trace is activated due to      *
  *                      residual data in the THTR thread        *
  *                      control block.                          *
  ****************************************************************
  As part of an execution unit switch CSQVFEB was called to obtain
  and format a new execution block EB, and thread control block
  THTR. Specific fields within the THTR were formatted, but the
  remaining THTR storage was not initialised.
  In the reported problem field thtr.pSeg64, which had not been
  formatted, contained residual data leading to the reported
  ABEND 0C4 in CSQWVCOL.
  
  Additional keywords: 6C6 S6C6 ABEND6C6 ABENDS6C6 vgca vgcathtr
  

Problem conclusion

• Module CSQVFEB has been updated so that any new THTR thread
  control block obtained will be cleared before individual fields
  are formatted.
  

Temporary fix

Comments

APAR Information

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

  PH08055

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

  UI76056

Modules/Macros

• CSQVFEB
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI76056

     UP21/07/19 P F107 ¢

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.