IBM Support

IV39310: POSSIBLE INCREASE IN RANDOM KPROC CPU USAGE. APPLIES TO AIX 5300-12

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APAR status

  • Closed as program error.

Error description

  • Possible increase in random kproc cpu usage;
    A typical case is where one thread opens /dev/random, but never
    reads from it. Then another thread opens /dev/random when a
    privious thread has already opened the /dev/random device,
    causing the increased cpu usage by the random kproc.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:
    * Systems running the 5300-12 Technology Level with the
    * bos.rte.security fileset at the 5.3.12.6 level.
    ****************************************************************
    * PROBLEM DESCRIPTION:
    * Possible increase in random kproc cpu usage.
    * A typical case is where one thread opens /dev/random, but
    # never reads from it. Then another thread opens /dev/random
    # when a previous thread has already opened the /dev/random
    # device, causing the increased cpu usage by the random kproc.
    ****************************************************************
    * RECOMMENDATION:
    * Install APAR IV39310.
    ****************************************************************
    

Problem conclusion

  • Modified the random device driver' kproc so to handle to case
    where a thread may open /dev/random device, but never closes
    it.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV39310

  • Reported component name

    AIX 5.3 EXT SUP

  • Reported component ID

    5765G0399

  • Reported release

    53E

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2013-04-04

  • Closed date

    2013-04-04

  • Last modified date

    2013-11-25

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

    IV33203

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

Fix information

  • Fixed component name

    AIX 5.3 EXT SUP

  • Fixed component ID

    5765G0399

Applicable component levels

  • R53E PSY

       UP

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Document Information

Modified date:
25 November 2013