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DB2 - Problem description

Problem IC81657 Status: Closed

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

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem 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.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All DB2 Users in DPF Linux environment or with               * 
* INTRA_PARALLEL enabled                                       * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Please upgrade to  DB2 Version 9.5 Fix Pack 10 or later      * 
****************************************************************
Local Fix:
Solution
Problem was first fixed in DB2 Version 9.5 Fix Pack 10
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
24.02.2012
29.08.2012
29.08.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP10
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.10 FixList
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