PH09044: SYSTEM CRASH WITH A WAIT STATE CODE OF 014 OC4-11 IN DSNLFRCV+04BE, 0C4-04 IN DSNB1GET+09D6

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer experienced a WAIT014 system outage due to a CVT
  overlay with a linkage stack entry.  This occurred after
  shutting down the CQM monitor.  Root cause was determined to be
  module CQCTTEX1 using a pointer that unexpectedly contained an
  address of zero.  This resulted in incorrect data access leading
  to a wild branch in system key7.  Typically a wild branch will
  result in an ABEND0C1 or ABEND0C4.  In the customer's case the
  z/OS system trace table showed many ABEND0C1 errors being
  retried by Rocket Software FRR CQCMMFRR.  However a bad branch
  may also result in execution of data as an instruction, or may
  result in random instruction execution, with highly
  unpredictable results.  In this customer's case, data looking
  like a LCTL load control register instruction was executed,
  corrupting CR15 (which is used as a linkage stack pointer) such
  that it pointed to system CVT control block, leading to the CVT
  overlay the next time CR15 was used.
  .
  Also resolves the following:
  0C4-00000011 (DSNLFRCV+04BE)
  0C4-00000004 (DSNB1GET+09D6)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IBM Db2 Common Collector z/OS.      *
  ****************************************************************
  * PROBLEM DESCRIPTION: System crash with a wait state code     *
  *                      of 014 DBM1 started task spin loop      *
  *                                                              *
  *                      At the time of the system crash, a DB2  *
  *                      subsystem monitored by CQM was          *
  *                      processing dynamic SQL text while CQM   *
  *                      was shutting down from a 'P CQM'        *
  *                      request.                                *
  ****************************************************************
  * RECOMMENDATION: APPLY the PTF.                               *
  ****************************************************************
  System crash with a wait state code of 014
  DBM1 started task. spin loop
  
  The customer in this case experienced wait state code 14, but
  there can be other unpredictable system failures, such as
  system disablement.
  

Problem conclusion

• The problem was triggered by zero address pointer to a CQM
  control block which caused a wild branch to execute
  unpredictable codes. The fix prevents this condition.
  
  Search Keywords:
  WAIT STATE, SPIN LOOP.
  

Temporary fix

Comments

• ×**** PE19/06/10 FIX IN ERROR. SEE APAR PH13178  FOR DESCRIPTION
  

APAR Information

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

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

  UI61918

Modules/Macros

• CQCMABA1 CQCMABB1 CQCMABC1 CQCMABC5 CQCMB2A1 CQCMB2B1 CQCMB2C5
  CQCMBNA1 CQCMBNB1 CQCMBNC5 CQCMBRA1 CQCMBRB1 CQCMBRC1 CQCMBRC5
  CQCMC1A1 CQCMC1B1 CQCMC1C1 CQCMC1C5 CQCMC2A1 CQCMC2B1 CQCMC2C1
  CQCMC2C5 CQCMCMA1 CQCMCMB1 CQCMCMC1 CQCMCMC5 CQCMCNA1 CQCMCNB1
  CQCMCNC1 CQCMCNC5 CQCMCOA1 CQCMCOB1 CQCMCOC1 CQCMCOC5 CQCMCRA1
  CQCMCRB1 CQCMCRC1 CQCMCRC5 CQCMCXA1 CQCMCXB1 CQCMCXC1 CQCMCXC5
  CQCMESA1 CQCMESB1 CQCMESC1 CQCMESC5 CQCMLCA1 CQCMLCB1 CQCMLCC1
  CQCMLCC5 CQCMLRA1 CQCMLRB1 CQCMLRC1 CQCMLRC5 CQCMPRA1 CQCMPRB1
  CQCMPRC1 CQCMPRC5 CQCMR1A1 CQCMR1B1 CQCMR1C1 CQCMR1C5 CQCMRLA1
  CQCMRLB1 CQCMRLC1 CQCMRLC5 CQCMRRA1 CQCMRRB1 CQCMRRC1 CQCMRRC5
  CQCMSIA1 CQCMSIB1 CQCMSIC1 CQCMSIC5 CQCMSRA1 CQCMSRB1 CQCMSRC1
  CQCMSRC5 CQCMT1A1 CQCMT1B1 CQCMT1C1 CQCMT1C5 CQCMTPA1 CQCMTPB1
  CQCMTPC1 CQCMTPC5 CQCMTRA1 CQCMTRB1 CQCMTRC1 CQCMTRC5 CQCMUGA1
  CQCMUGB1 CQCMUGC1 CQCMUGC5 CQCMZBA1 CQCMZBB1 CQCMZBC1 CQCMZBC5
  CQCTEDA1 CQCTEDB1 CQCTEDC1 CQCTEDC5 CQCTXLA1 CQCTXLB1 CQCTXLC1
  CQCTXLC5
  

Fix information

• Fixed component name

  COMMON COLLECTO

• Fixed component ID

  5639OLC00

Applicable component levels

• R110 PSY UI61918

     UP19/03/20 P F903 ¢

Fix is available

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