DB2 FOR LUW / DB2FORLUW / B10 - DB2

On the system where shared memory segment size limit is low, DB2
start might hang trying to allocate the DB2 trace memory
segment. db2star2 (executed as a part of db2start) will get
stuck in:
#0  in semop ()
#1  in sharedMutexLock(int)
#2  in sharedAttach(TRC_SHARED_IPC_INFO_T*, bool)
#3  in trcAttachShared ()
#4  in internalProcessTraceInit
#5  in sqltinit ()
#6  in DB2StartMain ()
#7  in main ()

Issue might happen when the size of default trace buffer (32 MB
on Linux, 128 MB on AIX, can be overridden up to 1024 MB using
DB2TRC_DEF_BUFFSIZE variable) is more than 8x higher than
current limit for shared memory segment size (shmmax). Problem
is most likely to happen on Linux.

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* USERS AFFECTED:                                              *
* ALL                                                          *
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* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
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* RECOMMENDATION:                                              *
* Upgrade to Db2 11.1 Mod 2 Fix Pack 2 or higher               *
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Interrupt db2start, remove all IPC resources owned by DB2
instance owner:
$ ipcrm -s 
Adjust shared memory limits, e.g on Linux:
$ sysctl -w kernel.shmmax=
(details for other platforms in DB2 documentation) and run
db2start again.

not known / see Local fix

forerunner  : IT16315 
follow-up : 

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

02.10.2017
24.10.2017
24.10.2017