IJ33605: PROCESSES WHICH ARE UISNG IOCP CAN HANG IN IOCP_SLEEP APPLIES TO AIX 7200-05

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the 7200-05 Technology Level with
  * any of the following filesets at or between the given levels:
  * MIN          MAX          FILESET
  * 7.2.5.1      7.2.5.1      bos.iocp.rte
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * Processes which are using iocp like sap's dataserver can
  * hang with following stack trace:
  * pvthread+095300 STACK:
  * Ý0011BCBC¨e_block_thread+00029C ()
  * Ý00014F50¨.kernel_add_gate_cstack+000030 ()
  * ÝF100091590391688¨iocp_sleep+000188 (??, ??, ??)
  * ÝF100091590395F44¨GetMultipleCompletionStatus+000124 (??,
  * ??, ??, ??, ??)
  * Ý00014D70¨.hkey_legacy_gate+00004C ()
  * Ý0000394C¨syscall+000244 ()
  * This can happen on the AIX LPARs which are running with
  * AIX 7.2 TL05 or above.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IJ33605.
  ****************************************************************
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the 7200-05 Technology Level with
  * any of the following filesets at or between the given levels:
  * MIN          MAX          FILESET
  * 7.2.5.1      7.2.5.1      bos.iocp.rte
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * Processes which are using iocp like sap's dataserver can
  * hang with following stack trace:
  * pvthread+095300 STACK:
  *  0011BCBC e_block_thread+00029C ()
  *  00014F50 .kernel_add_gate_cstack+000030 ()
  *  F100091590391688 iocp_sleep+000188 (??, ??, ??)
  *  F100091590395F44 GetMultipleCompletionStatus+000124 (??,
  * ??, ??, ??, ??)
  *  00014D70 .hkey_legacy_gate+00004C ()
  *  0000394C syscall+000244 ()
  * This can happen on the AIX LPARs which are running with
  * AIX 7.2 TL05 or above.
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IJ33605.
  ****************************************************************
  

Problem conclusion

• Modified icop code to avoid hang
  This required removal of the fix for IJ29928 which will
  be resolved in a future service pack.
  

Temporary fix

Comments

• 7200-05 - use AIX APAR IJ33605
  

APAR Information

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

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

  IJ33628 IJ34401

Fix information

• Fixed component name

  AIX V7.2

• Fixed component ID

  5765CD200

Applicable component levels

• R720 PSY U877521

     UP21/08/30 I 1000

PTF to Fileset Mapping

• U877521 bos.iocp.rte 7.2.5.100