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IV66482: TWO PROCESSES ACCESSING FILE IN /PROC CAN BOTH HANG. APPLIES TO AIX 7100-03

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • An example scenario that can cause a hang.
    
    1) Process-1 accesses a file /proc/PID/fd/100
    
    2) Process-2 "fuser /proc/PID/fd/100" is run.
    
    This could end up hanging both these processes
    permanently.
    

Local fix

Problem summary

  • An example scenario that can cause a hang.
    
    1) Process-1 accesses a file /proc/PID/fd/100
    
    2) Process-2 "fuser /proc/PID/fd/100" is run.
    
    This could end up hanging both these processes
    permanently.
    

Problem conclusion

  • Corrected the order of locks to avoid deadlock.
    

Temporary fix

Comments

  • 6100-08 - use AIX APAR IV65542
    6100-09 - use AIX APAR IV66429
    7100-02 - use AIX APAR IV66827
    7100-03 - use AIX APAR IV66482
    

APAR Information

  • APAR number

    IV66482

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-10-31

  • Closed date

    2014-10-31

  • Last modified date

    2015-09-30

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

    IV65542

  • 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



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV66482

Modified date: 30 September 2015