IBM Support

PH25670: CACHED/NONCACHED FILE ACCESS IN A DYNAMIC VIEW MAY CAUSE A DEADLOCK.

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • In an IBM Rational ClearCase If an application tries to read a
    file for non-cached I/O after it has been used for cached I/O, a
    deadlock may occur while flushing the cache, that process and
    any other processes that access that file will hang.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of ClearCase dynamic views on Microsoft Windows        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * If an application running on Microsoft Windows tries to read *
    * a file in a ClearCase dynamic view using non-cached I/O,     *
    * after it has already been in use for cached I/O, a deadlock  *
    * may occur while flushing the cache, and that process and any *
    * other processes trying to access that file will hang.        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • This problem is fixed in ClearCase 9.0.1.10 and 9.0.2.2.  MVFS
    handling of the  FILE_FLAG_NO_BUFFERING option during file open
    was modified to eliminate a possible deadlock.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH25670

  • Reported component name

    CLEARCASE WIN

  • Reported component ID

    5724G2900

  • Reported release

    901

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-05-21

  • Closed date

    2020-06-29

  • Last modified date

    2020-06-29

  • 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

    CLEARCASE WIN

  • Fixed component ID

    5724G2900

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"901","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
30 June 2020