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IV65814: SYSTEM HANGS AFTER PROCESS USES PSINFO ON ITSELF APPLIES TO AIX 6100-09

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ***************************************************************
    * USERS AFFECTED:
    * Systems running the 6100-09 Technology Levell or
    * VIOS 2.2.3.x with
    * bos.mp64 below the 6.1.9.100 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:
    * Install APAR IV65814.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv65814/
    * https://aix.software.ibm.com/aix/ifixes/iv65814/
    ***************************************************************
    

Local fix

Problem summary

  • ***************************************************************
    * USERS AFFECTED:
    * Systems running the 6100-09 Technology Level or
    * VIOS 2.2.3.x with
    * bos.mp64 below the 6.1.9.100 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:
    * Install APAR IV65814.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv65814/
    * https://aix.software.ibm.com/aix/ifixes/iv65814/
    ***************************************************************
    

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 number

    IV65814

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Submitted date

    2014-10-14

  • Closed date

    2015-01-05

  • Last modified date

    2015-11-22

Fix information

  • Fixed component name

    AIX 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U861403

       UP15/11/22 I 1000

PTF to Fileset Mapping

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Document Information

Modified date:
17 December 2021