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DB2 - Problem description

Problem IC88941 Status: Closed

POSSIBLE CRASH (ABORT/SEGV) WHEN RUNNING OUT OF MEMORY BECAUSE OF RECURSION
CONSUMING UP THE STACK

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
The signature here will be that we will end up with segv when 
trying to allocate a new frame in the stack and the frame 
address will fall in the range of the guard page. Also, most of 
the stack will be filled up with functions from oss layer for 
analysing out of memory error. 
 
From the stack example below what should be common is the 
recursion seen in the last top frames: 
 
Frame for _ossMemAlloc() 
Frame for ossGetPhysSwapInfo() 
Frame for ossErrorGetMemoryStatistics() 
Frame for ossErrorAnalysis() returned on call to 
ossErrorMemoryAnalysis() 
Frame for ossSystemErrorHandler() 
Frame for _ossMemAlloc() 
Frame for ossGetPhysSwapInfo() 
Frame for ossErrorGetMemoryStatistics() 
Frame for ossErrorAnalysis() returned on call to 
ossErrorMemoryAnalysis() 
Frame for ossSystemErrorHandler() 
Frame for _ossMemAlloc() 
Frame for ossGetPhysSwapInfo() 
Frame for ossErrorGetMemoryStatistics() 
Frame for ossErrorAnalysis() returned on call to 
ossErrorMemoryAnalysis() 
Frame for ossSystemErrorHandler() 
Frame for _ossMemAlloc() 
Frame for ossGetPhysSwapInfo() 
Frame for ossErrorGetMemoryStatistics() 
Frame for ossErrorAnalysis() returned on call to 
ossErrorMemoryAnalysis() 
Frame for ossSystemErrorHandler() 
Frame for _ossMemAlloc() 
Frame for sqlnlsMessage() 
Frame for sqlnlsgmsg() 
Frame for sqlogmsg_noconv() 
Frame for pdGetMessage() returned on call to pdLoadMessage() 
Frame for pdLogInternal() 
Frame for pdLog() 
Frame for sqlt_logadmin() 
Frame for sqlexGetGroupsForUser() 
Frame for sqlexSlsSystemAccrdb() 
Frame for sqlexEngAuthenticate() 
Frame for sqleExecuteSecurityCheck() 
Frame for sqeApplication::AppLocalStart() 
Frame for sqlelostWrp() 
Frame for sqleUCengnInit() 
Frame for sqleUCagentConnect() 
Frame for sqljsConnectAttach() 
Frame for sqljs_ddm_accsec() 
Frame for sqljsParseConnect() 
Frame for sqljsParse() 
Frame for sqljsSqlam() 
Frame for sqljsDriveRequests() 
Frame for sqljsDrdaAsInnerDriver() 
Frame for sqljsDrdaAsDriver() 
Frame for sqeAgentGRunEDU() 
Frame for sqlzRunEDU() 
Frame for sqloEDUEntry() 
 
This issue can occur on Solaris due to the fact that function 
'ossGetPhysSwapInfo()' on Solaris attempts to allocate memory. 
And this probably may also happen in other platforms with other 
situations as in funtion 'ossSystemErrorHandler()' we do not 
detect that we are entering again for the same reason.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Systems running with DB2 v97fp7 or below.                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrading to DB2 version v97fp8 resolves this issue.         * 
****************************************************************
Local Fix:
available fix packs:
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows

Solution
This issue is first fixed in DB2 v97fp8.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC92031 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
07.12.2012
18.10.2013
18.10.2013
Problem solved at the following versions (IBM BugInfos)
9.7.FP8
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.8 FixList