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Informix - Problem description

Problem IT31976 Status: Closed

IF UPDATE STATISTICS FOR PROCEDURE HAS TO CALL AUTOREGEXE IT MAYHANG THE
SCHEDULER AND THE CALLING SESSION

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
The reproduction environment defines a  Database containing
Stored procedures calling Datablade functions.
When an Update statistics for procedure has to call the
autoregexe task from the scheduler because
of a missing registration of the base datablade in the database
and some internal functions like
SYSBldSQLTextIn or SYSBldSQLTextOut are missing in the database
a deadlock situation may occur with
the following representation :

The user session calling the Update statistics hang in

yield_processor_svp
mt_yield
ph_submit_task
dbcron_submit_task
ifknowncreate
udr_determine
expr_determine
common_routine2expr
expr2expr
op_bind_rtn
....

pr_compile
aud_pr_compile
updprocstat

The first scheduler worker show the stack

mt_call_size
mi_call_size
autoregexe
udrlm_clang_execute_internal
udrlm_clang_execute
udrlm_exec_routine
udr_execute
mi_routine_exec
ph_exec_func
ph_execute
do_task
....

The second scheduler worker

yield_processor_mvp
mt_yield
lkwait
lkmanagex
lkrow
rsread
fmread
creatproc
aud_creatproc
excommand
sq_execute
mi_exec
QUERunQuery
SYSBldLogCallback
SYSBldParseScript
SYSBldRunSQLFile
SYSBldInit
SYSBldPrepare
SYSBldPrepare2
registerBlade
SYSBldCreate
SYSBldCustomPrepare

In this situation the user session cannot be stopped by onmode
-z, a long tx will happen which cannot be rollbacked without
restart
and the scheduler is blocked.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC4.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC4.                                                   *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
25.02.2020
10.12.2020
11.12.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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