PH36742: IBM MQ FOR Z/OS V9:CHINIT TERMINATION HANG AFTER 0C4 ABEND

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer found channel initiator does not stop after 0C4.
  During a test in customer environment they expected QMGR
  ssidMSTR to ABEND with 00C510AB. They also expected CHIN
  ssidCHIN to end after termination of the MSTR, but CHIN got
  ABEND0C4 and remain active.
  The abends sequence:
  S06C6-00C510AB in ssidMSTR
  0C4-11 in ssidCHIN
  0C4-4   in ssidCHIN   SNAP DUMP PSISTOPALLTASKS follows 0C4-4 .
  
  
  MQ development team confirmed that when the QMGR lost its
  connection to the Admin CF structure, the CHINIT thread that
  detected it was abended. This drove an FRR recovery processing
  routine in the MSTR address space.
  At the same time, QMGR termination was requested, and the QMGR
  started freeing storage as part of its cleanup processing.
  One of the key thread control blocks, the EB, was freed. This
  resulted in the FRR routine percolating to an ESTAE routine in
  the CHINIT address space. The ESTAE routine subsequently
  attempted to access the freed EB, which resulted in another
  abend.
  A tertiary recovery routine then took control, but a code
  defect resulted in the pointer to the thread's dynamic storage
  being passed incorrectly. This eventually led to the unhandled
  0C4 abend in CSQAPRHX. This left the CHINIT in an inconsistent
  state and was the root cause of the hang the customer observed.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0, Release 1          *
  *                 Modification 0 and Release 2                 *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Following a secondary abend during      *
  *                      recovery processing for an allied task, *
  *                      an error in secondary recovery          *
  *                      processing can result in an unhandled   *
  *                      0C4 abend in CSQAPRHX. When the         *
  *                      abending task is from the Channel       *
  *                      Initiator address space, this can       *
  *                      result in the Channel Initiator         *
  *                      hanging during shutdown processing,     *
  *                      accompanied by FFSTs in                 *
  *                      psiStopAllTasks.                        *
  ****************************************************************
  After detecting a problem, QMGR
  termination was initiated and the
  thread abended. Recovery processing
  percolated to CSQAPRHX's recovery
  routine which used the incorrect level
  of indirection for the data area
  address resulting in an 0C4 abend.
  

Problem conclusion

• The code has been changed to resolve the indirection on
  recovery and the resulting 0C4 abend.
  

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:

  UI77122 UI77123 UI77124

Modules/Macros

• CSQ0CACB CSQ0COPN CSQ0DEAD CSQ0DPCS CSQ0DSVC CSQ0ERST CSQ0IPRH
  CSQ0LEPL CSQ3AAES CSQ3AM00 CSQ3AMFR CSQ3AUCM CSQ3AUCN CSQ3AUFR
  CSQ3AUGI CSQ3CT30 CSQ3CT80 CSQ3EXT0 CSQ3GCAB CSQ3ID80 CSQ3IDES
  CSQ3LCHX CSQ3PR00 CSQ3RIA0 CSQ3RIM0 CSQ3RIND CSQ3RRSR CSQ3RRSX
  CSQ3RRXF CSQ3SSES CSQ3SSFR CSQ9SCN9 CSQAPRHX CSQARIB  CSQGEXIT
  CSQGFFRR CSQGFRCV CSQGGEPL CSQIRECP CSQJB004 CSQJC001 CSQJC003
  CSQJC006 CSQJC008 CSQJC09A CSQJCR01 CSQJOFF6 CSQJOFF9 CSQJPOPN
  CSQJR007 CSQJR06A CSQJRE01 CSQJRE08 CSQJRE26 CSQJW008 CSQJW206
  CSQJWE01 CSQMALCH CSQMCALH CSQMCCHT CSQMCDLC CSQMCFEF CSQMCFRQ
  CSQMCFTK CSQMCFWU CSQMCIDT CSQMCLMT CSQMCMHB CSQMCPRH CSQMCRES
  CSQMCTXE CSQMCTXS CSQMFMH1 CSQMXARH CSQMXCLN CSQMZLOO CSQRCAFR
  CSQRCRFR CSQRCRQS CSQRCRSC CSQRCSHT CSQRCURS CSQRIURS CSQRPBCS
  CSQRPBCW CSQRPECS CSQRPLCS CSQRRRQS CSQRRURS CSQRUA01 CSQRUB01
  CSQRUC01 CSQRUE01 CSQSCON  CSQSCON2 CSQSDMPS CSQSFACL CSQSFBK
  CSQSFPL  CSQSGMN  CSQSHDWN CSQSPOWN CSQSPURS CSQSRSUP CSQSTERM
  CSQSVPL  CSQUZAP  CSQV002M CSQVCFRR CSQVCONN CSQVCRTH CSQVCST0
  CSQVDISC CSQVDST0 CSQVEOT1 CSQVEUS1 CSQVEUS2 CSQVEUS3 CSQVEUS4
  CSQVFACE CSQVFEB  CSQVGACE CSQVIALC CSQVLEPL CSQVLFRR CSQVLTT0
  CSQVSDC0 CSQVSLK  CSQVSLT0 CSQVSRRX CSQVSRX  CSQVSUL0 CSQVTFRR
  CSQVTRTH CSQVUTIL CSQVXLT0 CSQVXUL0 CSQWAAPI CSQWACC6 CSQWACCV
  CSQWDSD0 CSQWDSDM CSQWDST2 CSQWVFRR CSQWVOPX CSQWVSMT CSQWVSR2
  CSQWVZSA CSQWVZSS CSQWVZXT CSQWWFST CSQXDTRM CSQXFSTR CSQXGRIM
  CSQXJST  CSQXSUPR CSQXTCNC CSQXTCTL CSQYALLI CSQYASCP CSQYEAT2
  CSQYEATE CSQYEPL0 CSQYESCF CSQYESWE CSQYLGBL CSQYLGUN CSQYMESP
  CSQYMESS CSQYSIRM CSQYSTRT
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI77124

     UP21/09/29 P F110

• R100 PSY UI77140

     UP21/10/04 P F110

• R200 PSY UI77122

     UP21/10/01 P F110

Fix is available

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