|
Problem IT11952
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Status: Closed |
MEMORY CORRUPTION AND OTHER ERRORS POSSIBLE WHEN USING CDC
|
| product: |
INFORMIX SERVER / 5725A3900 / B70 - IDS 11.70 |
| Problem description: |
When using the Change Data Capture API for Informix Dynamic
Server a possibility exists for memory corruption to occur under
certain circumstances. This is a regression that is due to the
fix for APAR IT07378. When the corruption occurs a number of
messages will appear in the online log together with an Assert
Failure for memory block header corruption. The online log
messages are of the form:
15:31:42 CDR: A magic number verify failed for Snoop class
SnoopBuf_t File snoop/snoopxformbaseclass.c Line 311 at address
700003176e73140
actual magic value was 0xe000062
15:31:42 CDR: A magic number verify failed for Snoop class
SnoopBuf_t File snoop/snoopobjs.c Line 6922 at address
700003176e73140
actual magic value was 0xe000062
...
15:31:42 CDC: Log Seq: Page out-of-seq error [got page
769640:7d4f, cur page 769640:7d49]
15:31:42 CDC: Log Seq: Page out-of-seq error [got page
769640:7d50, cur page 769640:7d49]
...
15:31:42 Assert Failed: Memory block header corruption detected
in mt_shm_free 2
An example stack for the failing thread in the AF file is:
(oninit)afstack
(oninit)afhandler
(oninit)affail_interface
(oninit)mt_free
(oninit)snoopsess_friend_freer_callback
(oninit)sbt_subclass_fmrowmig_p_deinit
(oninit)sbt_subclass_fmrowmig_deactivate_begin
(oninit)sbt_deactivate_begin
(oninit)sbtm_p_deactivate_core
(oninit)sbtm_deactivate
(oninit)snoopsess_p_deactivate_core
(oninit)snoopsess_deactivate
(oninit)cdc_apiudr_deactivatesess
(oninit)udrlm_clang_execute_internal
(oninit)udrlm_clang_execute
(oninit)udrlm_exec_routine
(oninit)udr_execute
(oninit)exroutine
(oninit)geval
(oninit)evalcols
(oninit)runudr
(oninit)ip_curnext
(oninit)ip_fetch
(oninit)getrow
(oninit)fetchrow
(oninit)exfetch
(oninit)sql_nfetch
(oninit)sq_nfetch
(oninit)sqmain
(oninit)listen_verify
(oninit)spawn_thread
(oninit)th_init_initgls
(oninit)startup
Due to the nature of memory block header AFs there could be
other possible stacks. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of the Change Capture API (CDC) *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Update to IBM Informix Server 11.70.xC9 *
**************************************************************** |
| Local Fix: |
|
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 23.10.2015
09.06.2017
09.06.2017 |
| Problem solved at the following versions (IBM BugInfos) |
11.70.xC9
|
| Problem solved according to the fixlist(s) of the following version(s) |
