APAR status
Closed as program error.
Error description
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.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * those using referential constraints * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Update to IBM Informix Server 12.10.xC6 * ****************************************************************
Problem conclusion
Problem Fixed In IBM Informix Server 12.10.xC6
Temporary fix
Comments
APAR Information
APAR number
IT08390
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
C10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-04-17
Closed date
2015-12-30
Last modified date
2015-12-30
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
INFORMIX SERVER
Fixed component ID
5725A3900
Applicable component levels
RB70 PSN
UP
RB70 PSY
UP
RC10 PSN
UP
RC10 PSY
UP
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Document Information
Modified date:
30 December 2015