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IV95858: SYSTEM CRASH WHEN USING PROCFS FOR PROCESSES CLOSING MANY FILES APPLIES TO AIX 7200-00

A fix is available

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APAR status

  • Closed as program error.

Error description

  • **************************************************************
    * USERS AFFECTED:
    * Systems running the AIX 7200-00 Technology Level
    * with bos.mp64 at the 7.2.0.4 level and below.
      **************************************************************
    * ERROR DESCRIPTION:
    * If procfs /proc/<pid>/fd/ directory is accessed for a
    * process that uses many file descriptors, the LPAR my crash
    * due to bad values in the application stack data.
    * This occurs when the application closes many file
    * descriptors all at once while at the same time the procfs
    * data in /proc/<pid>/fd/ is being accessed.
    *
    * This has been most commonly seen when the 'fuser' command is
    * run while an application is running that opens and closes
    * many files during its execution.
    * The crash can have varied symptoms, but in one common case
    * the stack looks like:
    * (0)> f
    * pvthread+018000 STACK:
    * 000039B4 .sys_call_ret+000078 ()
    * 00003958 .sys_call_ret+00001C ()
      **************************************************************
    * RECOMMENDATION:
    * Install APAR IV95858.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv95858/
    * https://aix.software.ibm.com/aix/ifixes/iv95858/
    * The ifix can be installed using Live Update (LU).
    * If LU is not used, installation of the ifix requires a
    * reboot.
      **************************************************************
    

Local fix

Problem summary

  • System crash with following stack:
    (0)> f
    pvthread+018000 STACK:
     000039B4 .sys_call_ret+000078 ()
     00003958 .sys_call_ret+00001C ()
    uninitialized stack variable content access to write
    reulted in corruption of mst/other u-block area.
    

Problem conclusion

  • Change the code to avoid this corruption.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    IV95858

  • Reported component name

    AIX V7.2

  • Reported component ID

    5765CD200

  • Reported release

    720

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Submitted date

    2017-05-05

  • Closed date

    2017-05-05

  • Last modified date

    2017-09-25

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

    IV92812

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

Fix information

  • Fixed component name

    AIX V7.2

  • Fixed component ID

    5765CD200

Applicable component levels

  • R720 PSY U874044

       UP17/09/21 I 1000 Ž

PTF to Fileset Mapping

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSVEF8","label":"AIX 7.2 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11S","label":"AIX 7.2 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
25 September 2017