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PI72350: Fix potential crash in mod_mem_cache in IHS 8.5 and earlier

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APAR status

  • Closed as program error.

Error description

  • mod_mem_cache could crash if two threads try to remove the same
    cache entry concurrently.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of mod_mem_cache in IBM HTTP Server   *
    *                  8.5 and earlier                             *
    ****************************************************************
    * PROBLEM DESCRIPTION: A crash could occur if two threads      *
    *                      concurrently try to remove the same     *
    *                      cache entry.                            *
    ****************************************************************
    * RECOMMENDATION:  Apply this fix if using the mod_mem_cache   *
    *                  module in IBM HTTP Server 8.5 and earlier   *
    ****************************************************************
    A thread concurrency issue in mod_mem_cache could result in a
    crash.
    

Problem conclusion

  • Fixed the concurrent removal of stale entries issue which
    could lead to a crash.
    
    This fix is targeted for IBM HTTP Server fix packs:
    - 7.0.0.43
    - 8.0.0.14
    - 8.5.5.12
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI72350

  • Reported component name

    IBM HTTP SERVER

  • Reported component ID

    5724J0801

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-11-16

  • Closed date

    2017-03-07

  • Last modified date

    2017-03-07

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

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

Fix information

  • Fixed component name

    IBM HTTP SERVER

  • Fixed component ID

    5724J0801

Applicable component levels

  • R700 PSY

       UP

  • R800 PSY

       UP

  • R850 PSY

       UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTJ","label":"IBM HTTP Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
07 September 2022