INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

Doing a select containing a where condition like 
select * from vts where  tmstamp > today 
 
will generate an Af file, displays error messages 
 244: Could not do a physical-order read to fetch next row. 
 
12803: Error in executing an access_method routine execution 
sequence. 
 
and writes also error message 9871 to the online.log 
14:49:47  Assert Failed: Exception Caught. Type: MT_EX_OS, 
Context: mem 
14:49:47  IBM Informix Dynamic Server Version 12.10.FC4X1 
14:49:47   Who: Session(30, informix@bosshost, 11817, 10aaa9648) 
                Thread(61, sqlexec, 10aa690a8, 1) 
                File: mtex.c Line: 420 
14:49:47   Action: Please notify IBM Informix Technical Support. 
14:49:47  stack trace for pid 11583 written to /dump/af.4256b65 
14:49:48   See Also: /dump/af.4256b65 
14:49:54  Exception Caught. Type: MT_EX_OS, Context: mem 
14:49:54  (-9791): ERROR: Routine execution trap -- 
procname=<ts_vtam_beginscan> procid=581 
    reason: mem 
14:51:20  Checkpoint Completed:  duration was 0 seconds. 
14:51:20  Mon Sep  1 - loguniq 32, logpos 0xa14018, timestamp: 
0x229aee Interval: 1208 
 
 
this is the stack on Solaris: 
14:49:41  Stack for thread: 61 sqlexec 
... 
0xffffffff7c168504 ts_vtam_sem_log_record_dump 
0xffffffff7c16b218 ts_vtam_pdq_foreground_send_command 
0xffffffff7c16c128 ts_vtam_beginscan 
0x1006f3b4c oninit :: udrlm_clang_execute_interna 
0x1006f2634 oninit :: udrlm_clang_execute 
0x1006ebdac oninit :: udrlm_exec_routine 
0x1002ff710 oninit :: udr_execute 
0x10145c4d4 oninit :: vti_vii_udr_execute 
0x101453060 oninit :: vti_beginscan 
0x1014535b4 oninit :: vti_getnext 
0x1012c1c24 oninit :: fmread 
0x100430edc oninit :: readseq_single 
0x10042fcd4 oninit :: gettupl 
0x10042a850 oninit :: scan_next 
0x10044816c oninit :: getrow 
0x100447d8c oninit :: fetchrow 
0x1001db9e0 oninit :: exfetch 
0x10068f8b4 oninit :: sql_nfetch 
0x10068f25c oninit :: sq_nfetch 
0x1007567f0 oninit :: sqmain

**************************************************************** 
* USERS AFFECTED:                                              * 
* timeseries vti queries using "today" as the qualifier        * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to IDS-12.10.xC5                                      * 
****************************************************************

Problem Fixed In IDS-12.10.xC5

not known / see Local fix

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

04.09.2014
16.10.2015
16.10.2015