INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

Running a stress test using 3 tables with referential 
constraints between them, and having ER replicates defined on 
them, and then a constant stress of update statistics commands 
being run, causes the server to assert fail in various ways. 
 
The 1 thing that appears to be in common between all the crashes 
is that it appears the server is referencing a freed data 
dictionary entry. 
 
The stress test was also run with CCFLAGS set to 0x08000200 
(which enables memory scribbling and any dictionary entry that 
goes to refcount of 0 to be automatically freed). 
 
Here's the kinds of af's seen: 
 
1) negative memory size allocation 
12:09:35  Assert Failed: Condition Failed (Bad allocation size 
(-515) for pool 'CDR' (0x47cd7040)), In (mt_shm_malloc_segid) 
12:09:35   Who: Session(82606, informix@server, 0, 0x46ac3b30) 
        Thread(82639, CDRD_55, 46a84fa8, 1) 
 
afstack 
afhandler 
affail_interface 
mem_asfail 
mt_shm_malloc_segid 
mt_realloc 
cdrMemReallocRtn 
dsiGetReplRow 
dsiResolverThread 
cdrTrampolineThread 
th_init_initgls 
startup 
 
-515 as a hex number is (in 2 bytes form or a short) is 0xfdfd 
which is the byte pattern of freed memory (the free scribble 
byte is 0xfd) 
 
2) segv with this stack: 
 
afstack 
mt_ex_throw_sig 
afsig_handler 
<signal frame> 
cmprstr 
gettab 
sqcdrDbop 
dsiResolverThread 
cdrTrampolineThread 
th_init_initgls 
startup 
 
3) af warning about dictionary entry not found with either of 
these 2 stacks (with the decrrefcount 1 happening more 
frequently) 
 
afwarn_interface 
decrrefcount 
rmdiclink 
closerel 
close_cb_subtree_r 
close_cb_subtree 
closesdb 
doreleasesdb 
sqcdrDbop 
dsiResolverThread 
cdrTrampolineThread 
th_init_initgls 
startup 
 
 
afwarn_interface 
 incrrefcount 
make_constr_tab_hierarchy 
set_per_constr_tabs 
bldrefsx 
maybe_bldrefs 
sqbind 
sq_common_bind 
sqmain 
spawn_thread 
th_init_initgls 
startup 
 
and a couple other far less frequently occuring segv crashes.

**************************************************************** 
* USERS AFFECTED:                                              * 
* those using referential constraints                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to IBM Informix Server 12.10.xC6                      * 
****************************************************************

Problem Fixed In IBM Informix Server 12.10.xC6

not known / see Local fix

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

17.04.2015
30.12.2015
30.12.2015

12.10.xC6