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Informix - Problem description

Problem IT34433 Status: Closed

DRDA CLIENTS MAY SEE AN EXCEPTION IN DRDA_RECEIVE_BUFF IN A LOW/OUT OF
MEMORY SITUATION

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
Imagine we have an environment with DRDA clients using a
DRDA_COMMBUFFSIZE setting of 2048.
The instance is restricted to 16GB by edition limits. After a
certain time the memory turns to be
fragmented in the way that the largest amount of continuous
blocks is lower then 512 Blocks needed
for the communication in DRDA even there are plenty buffers
available:

id         key        addr             size             ovhd
class blkused  blkfree
9404417    52564802   4cc00000         14763950080
173016984 V*    128061   3476419
9568263    52564807   441e00000        35651584         419352
V*    135      8569

onstat -g nbm |  grep larg
 used = 128061, largest_free = 511
 used = 135, largest_free = 511

In this case frequent af files are seen with

0x0000000000bb411e (/opt/IBM/informix/bin/oninit)
_Z17drda_receive_buff
0x0000000000bb4367 (/opt/IBM/informix/bin/oninit)
_Z15sqljcIntReceiveP10sqljCmnMgr
0x0000000000bac101 (/opt/IBM/informix/bin/oninit)
_Z14sqljcReadHdrAsP10sqljCmnMgrPt
0x0000000000ba062f (/opt/IBM/informix/bin/oninit) sqljsParse
0x0000000000b984c6 (/opt/IBM/informix/bin/oninit) do_drdamain
0x0000000000ae472a (/opt/IBM/informix/bin/oninit) drdamain
0x000000000154208b (/opt/IBM/informix/bin/oninit) spawn_thread
0x0000000001401c70 (/opt/IBM/informix/bin/oninit)
th_init_initgls
0x0000000001448997 (/opt/IBM/informix/bin/oninit) startup
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC6.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* You have an environment with DRDA clients using a            *
* DRDA_COMMBUFFSIZE setting of 2048.                           *
* The instance is restricted to 16GB by edition limits. After  *
* a certain time the memory turns to be                        *
* fragmented in the way that the largest amount of continuous  *
* blocks is lower then 512 Blocks needed                       *
* for the communication in DRDA even though there are plenty   *
* of buffers available:                                        *
*                                                              *
* id         key        addr             size             ovhd *
* class blkused  blkfree                                       *
* 9404417    52564802   4cc00000         14763950080           *
* 173016984 V*    128061   3476419                             *
* 9568263    52564807   441e00000        35651584              *
* 419352                                                       *
* V*    135      8569                                          *
*                                                              *
* onstat -g nbm |  grep larg                                   *
*  used = 128061, largest_free = 511                           *
*  used = 135, largest_free = 511                              *
*                                                              *
* In this case frequent assert failure files are seen with the *
* following stack:                                             *
*                                                              *
* (/opt/IBM/informix/bin/oninit) _Z17drda_receive_buff         *
* (/opt/IBM/informix/bin/oninit)                               *
* _Z15sqljcIntReceiveP10sqljCmnMgr                             *
* (/opt/IBM/informix/bin/oninit)                               *
* _Z14sqljcReadHdrAsP10sqljCmnMgrPt                            *
* (/opt/IBM/informix/bin/oninit) sqljsParse                    *
* (/opt/IBM/informix/bin/oninit) do_drdamain                   *
* (/opt/IBM/informix/bin/oninit) drdamain                      *
* (/opt/IBM/informix/bin/oninit) spawn_thread                  *
* (/opt/IBM/informix/bin/oninit) th_init_initgls               *
* (/opt/IBM/informix/bin/oninit) startup                       *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC6 (when available).                                  *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
02.10.2020
25.01.2021
25.01.2021
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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