|
Problem IT08467
|
Status: Closed |
SEGV POSSIBLE IN DBS_TOTAL_SPACE WHEN CREATING OBJECT USING AUTOLOCATE FEATURE WHILE CONCURRENTLY ADDING A DBSPACE |
| product: |
IFMX ULT WHSE E / IM0019BOS / C10 - IDS 12.10 |
| Problem description: |
A session attempting to create a table/index that is using the
autolocate feature can generate a SEGV in dbs_total_space() due
to a timing problem with a 2nd thread attempting to add a
dbspace.
Stack trace of the crashing thread would look something like
this:
afstack
mt_ex_throw_sig
afsig_handler
<signal frame>
dbs_total_space
rs_locate_idx
makedetach
concreatidx
dounique
creatab
aud_creatab
excommand
sq_execute
sqmain
spawn_thread
th_init_initgls
startup
or
afstack
mt_ex_throw_sig
afsig_handler
<signal frame>
dbs_total_space
rs_locate_rrfrag
st2cb
tab2cb
stmt2cb
p_sp2cb
parsecmd
sqcmd
sq_cmnd
sq_prepare
sqmain
listen_verify
spawn_thread
th_init_initgls
startup
current SQL for AF'ing session:
CREATE COLLECTION "d_35976558867.system.users" TABLE
system_users (id
CHAR(128) PRIMARY KEY NOT NULL, data bson, modCount BIGINT,
flags INT)
EXTENT SIZE 64 NEXT SIZE 64 LOCK MODE ROW
Session attempting to add dbspace:
execute function task("create dbspace from storagepool",
"newdbs1", "10
MB")
*Note it doesn't need to be a session adding a dbspace via the
admin task, a regular onspaces -c -d would also cause problems.*
top portion of stack for thread attempting to add space:
yield_processor_mvp
mt_lock_wait
mt_lock
rschkadd
aud_ischkadd
admin_dbs_create
admin_create_dbspace_from_storagepool
do_job_cc
admin_cc |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users running with AUTOLOCATE set in a DDL-intensive *
* environment with spaces being added or dropped *
* simultaneously. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Update to IBM Informix Server 12.10.xC6 *
**************************************************************** |
| Local Fix: |
|
| Solution |
Problem Fixed In IBM Informix Server 12.10.xC6 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 22.04.2015
30.12.2015
30.12.2015 |
| Problem solved at the following versions (IBM BugInfos) |
12.10.xC6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 12.10.xC6
|
 |
