PI94365: ABEND 878-10 ABEND 878-00C CSQX027E UNABLE TO GET STORAGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Channel initiator CHIN task hung due to storage shortage.
  .
  +CSQX004I CSQ1 CSQXSPRM Channel initiator is using
                 1565 MB of local storage, 2 MB are free
  ICH409I 878-00C ABEND DURING IRRSIA00 PROCESSING.
  IEA794I SVC DUMP HAS CAPTURED: DUMPID=078 REQUESTED BY JOB
                 (CSQ1CHIN) DUMP
  TITLE=ISSUER=IRRRCOMR,COMPID=5752-XXH00,COMPON=RACF,CSECT=
  IRRRIA00,LVL=UA83371,ABEND=878-00C,USR=CSQ1CHIN
  .
  IEA705I SYSTEM COMPLETION CODE=878  REASON CODE=00000010
  +CSQX027E CSQ1 CSQXRCTL Unable to get storage,
  .
  Subpool 131 key 8 storage high
  .
  The listener in retry processing is leaking a small amount of
  stack storage each time it enters retry processing.
  

Local fix

• Stop the retrying listener or resolve the networking issue that
  is preventing the listener from connecting.
  

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: XSKB storage leak in Subpool 131 Key 8  *
  *                      storage in the channel initiator        *
  *                      address space.                          *
  ****************************************************************
  When an ending channel initiator task releases its XEB, CSQXVFRE
  is called to release any XSKB stack segments on the XEB free
  chain, if any.
  An error in CSQXVFRE causes the last XSKB to be skipped when
  freeing this chain, resulting in the 32K segment being leaked.
  
  Over time an accumulation of these leaked blocks can lead to
  performance degradation and/or storage shortage in the channel
  initiator address space.
  
  Additional keywords: SOS 878 CSQX027E
  

Problem conclusion

• CSQXVFRE has been changed to free all XSKB segments on the
  free chain.
  

Temporary fix

Comments

APAR Information

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

  PI89563

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

  UI54537 UI75406 UI75407

Modules/Macros

• CSQXVFRE
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI75407

     UP21/05/29 P F105 ¢

• R200 PSY UI75406

     UP21/05/29 P F105 ¢

Fix is available

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