IC84433: ON LINUX PLATFORMS, DB2 FCM THREADS (DB2FMCS AND DB2FCMR) MAY HANG IN SELECT() SYSTEM CALL

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • On Linux Platforms, DB2 FCM threads (db2fmcs and db2fcmr) may
    hang in select() system call due to possibly reaching file
    descriptor limit . The symptom would be hard to confirm via a
    stack trace of the FCM threads since the stack generation tools
    (db2pd -stack, pstack, gstack, gcore) will all clear up the
    hang.
    
    With this APAR db2fcm (s and r)  threads will have the ability
    to use epoll() instead of select() since epoll() does not have
    the file descriptor limit that select() has.  This change will
    not be by default but instead enabled via a registry variable -
    DB2_FCM_FDPOLL.  The default for this registry variable will be
    FALSE on Linux.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * DB2 Users on Linux                                           *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * upgrade to DB2 Version 10.1.1 or higher                      *
    ****************************************************************
    

Problem conclusion

  • Problem was first fixed in DB2 Version 10 Fix Pack 1
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC84433

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-06-14

  • Closed date

    2012-11-13

  • Last modified date

    2012-11-13

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

    IC81639

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

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RA10 PSN

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

10.1

Reference #:

IC84433

Modified date:

2012-11-13

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