IV66484: SYSTEM HANGS AFTER PROCESS USES PSINFO ON ITSELF APPLIES TO AIX 7100-03

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ***************************************************************
  * USERS AFFECTED:
  * Systems running the 7100-03 Technology Level
  * with bos.mp64 below the 7.1.3.45 level.
  ***************************************************************
  * PROBLEM DESCRIPTION:
  * If a process tries to get psinfo on itself from a prochcall
  * resource handler during exec, that process will end up
  * stuck sleeping in prUblockSegAttach forever, waiting for
  * SEXECING_P to clear.  This will cause key system daemons to
  * eventually hang, waiting on a lock held by that process.
  * This will lead to the entire system to be effectively hung.
  *
  * This has been commonly encountered on systems running
  * Symantec VCS 6.0.xxx or custom kernel extensions that
  * register a prochcall resource handler during exec.
  ***************************************************************
  * RECOMMENDATION:
  * An interim fix is available from either
  * ftp://aix.software.ibm.com/aix/ifixes/iv66484/
  * https://aix.software.ibm.com/aix/ifixes/iv66484/
  ***************************************************************
  

Local fix

Problem summary

• ***************************************************************
  * USERS AFFECTED:
  * Systems running the 7100-03 Technology Level
  * with bos.mp64 below the 7.1.3.45 level.
  ***************************************************************
  * PROBLEM DESCRIPTION:
  * If a process tries to get psinfo on itself from a prochcall
  * resource handler during exec, that process will end up
  * stuck sleeping in prUblockSegAttach forever, waiting for
  * SEXECING_P to clear.  This will cause key system daemons to
  * eventually hang, waiting on a lock held by that process.
  * This will lead to the entire system to be effectively hung.
  *
  * This has been commonly encountered on systems running
  * Symantec VCS 6.0.xxx or custom kernel extensions that
  * register a prochcall resource handler during exec.
  ***************************************************************
  * RECOMMENDATION:
  * An interim fix is available from either
  * ftp://aix.software.ibm.com/aix/ifixes/iv66484/
  * https://aix.software.ibm.com/aix/ifixes/iv66484/
  ***************************************************************
  

Problem conclusion

• Avoid dead lock by properly serialize the opertion of holding
  the lock and posting event.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

• 6100-09 - use AIX APAR IV65814
  6100-09 - use AIX APAR IV65814
  7100-03 - use AIX APAR IV66484
  

APAR Information

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

  IV65814

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

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY U865837

     UP15/05/19 I 1000

PTF to Fileset Mapping

• U865837 bos.mp64 7.1.3.45