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Informix - Problem description

Problem IT30342 Status: Closed

MEMORY BLOCK HEADER CORRUPTION MAY OCCUR WHEN A SELECT CURSOR ISRE-OPENED

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
An assert failure may occur when the cursor for a select
statement using one or more sub-queries is re-opened a number of
times. An example of the type of AF that may occur:

Bad block header 0x700000021ae7ea8
Assert Warning: Memory block header corruption detected in
mt_shm_free 1
IBM Informix Dynamic Server Version 12.10.FC13
 Who: Session(9, informix@idsserver.com, -1,
700000020513048)
      Thread(57, sqlexec, 7000000204d1368, 1)
      File: mtshpool.c Line: 2767
 Results: Pool repaired
 Action: Please notify IBM Informix Technical Support.

(oninit)afhandler
(oninit)afwarn_interface
(oninit)mt_free
(oninit)fm_vti_freefrag
(oninit)fm_closefrags@AF25_13
(oninit)fm_closefrags
(oninit)fmclose
(oninit)sqisclose
(oninit)closerel
(oninit)scan_free
(oninit)join_free
(oninit)join_free
(oninit)sort_free
(oninit)closecb
(oninit)close_cb_subtree_r
(oninit)close_cb_subtree
(oninit)closesdb
(oninit)close_cursor
(oninit)sql_close
(oninit)sq_close
(oninit)sqmain

This example is from the server running on AIX. The stack for
other OS platforms may be slightly different. Depending on how
the memory is corrupted other types of AF are also possible,
such as a crash caused by attempting to access invalid memory.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC14 and 14.10.xC3.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 12.10.xC14 or 14.10.xC3.           *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
20.09.2019
25.02.2020
25.02.2020
Problem solved at the following versions (IBM BugInfos)
12.10.xC14,
14.10.xC3
Problem solved according to the fixlist(s) of the following version(s)
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