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IV36524: RUNNING MULTIPLE FUSER COMMANDS CAN HANG OR CRASH THE SYSTEM APPLIES TO AIX 7100-01

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Intensive usage of the fuser command, including running it
    multiple times at once on the same system, with certain
    timing, can cause the system to hang or crash.
    .
    The crash would have this stack:
    (3)> f
    pvthread+056800 STACK:
    ■00178E74iHold+000094 (0000000000000020 ■??)
    ■003DE234j2_hold+000014 (??)
    ■0059D41Cvnop_hold+00003C (??)
    ■001CDE2CprocfsGetattrCwdRoot+00012C (??, ??, ??, ??)
    .
    The hang would have 2 threads deadlocked:
    Thread A:
    ■00509574slock+000474
    ■00009558.simple_lock+000058 ()
    ■002060A8procfsGetattrCwdRoot+0000E8 (??, ??, ??, ??)
    .
    Thread B:
    ■00509574slock+000474
    ■00009558.simple_lock+000058 ()
    ■001D4ED0prGetEref+000070 (??)
    ■00206068procfsGetattrCwdRoot+0000A8 (??, ??, ??, ??)
    

Local fix

Problem summary

  • ************************************************************
    * USERS AFFECTED:
    * Systems running the 7100-01 Technology Level with
    * bos.mp64 below the 7.1.1.19 level.
    ************************************************************
    * PROBLEM DESCRIPTION:
    * Intensive usage of the fuser command, including running it
    * multiple times at once on the same system, with certain
    * timing, can cause the system to hang or crash.
    * .
    * The crash would have this stack:
    *     (3)> f
    *     pvthread+056800 STACK:
    *      00178E74 iHold+000094 (0000000000000020  ?? )
    *      003DE234 j2_hold+000014 (??)
    *      0059D41C vnop_hold+00003C (??)
    *      001CDE2C procfsGetattrCwdRoot+00012C (??, ??, ??, ??)
    * .
    * The hang would have 2 threads deadlocked:
    * Thread A:
    *  00509574 slock+000474
    *  00009558 .simple_lock+000058 ()
    *  002060A8 procfsGetattrCwdRoot+0000E8 (??, ??, ??, ??)
    * .
    * Thread B:
    *  00509574 slock+000474
    *  00009558 .simple_lock+000058 ()
    *  001D4ED0 prGetEref+000070 (??)
    *  00206068 procfsGetattrCwdRoot+0000A8 (??, ??, ??, ??)
    ************************************************************
    * RECOMMENDATION:
    * Install APAR IV36524.
    ************************************************************
    

Problem conclusion

  • Code has been fixed to protect these critical sections from
    potential race condition and deadlock
    

Temporary fix

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

Comments

  • 6100-06 - use AIX APAR IV36527
    6100-07 - use AIX APAR IV34105
    6100-08 - use AIX APAR IV38589
    7100-00 - use AIX APAR IV36835
    7100-01 - use AIX APAR IV36524
    7100-02 - use AIX APAR IV38251
    

APAR Information

  • APAR number

    IV36524

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Submitted date

    2013-02-09

  • Closed date

    2013-04-24

  • Last modified date

    2013-11-24

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

    IV34105

  • 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 U855903

       UP13/07/30 I 1000

PTF to Fileset Mapping

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Document Information

Modified date:
24 November 2013