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Latest versionsfixlist
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Informix - Problem description

Problem IT03863 Status: Closed

ASSERTION FAILURE SEGV IN LKDEQUE WHEN USING PDQ, COMMITTED READ LAST
COMMITTED ISOLATION AND BATCHEDREAD_INDEX SET TO 0

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
A query that has PDQ enabled and multiple threads, that is using 
the committed read last committed isolation level and it 
encounters a locked row doing a index scan when 
BATCHEDREAD_INDEX is set to 0 will assert fail crash the server 
with the following stack trace: 
 
afstack 
mt_ex_throw_sig 
afsig_handler 
<signal frame> 
lkdeque 
lkwait 
lkmanagex 
lkrow 
read_record_lc 
read_record 
gather_records 
rsread 
fmread 
gettupl 
scan_next 
join_next 
producer_thread 
startup 
 
 
Portions of onstat -g ses output that show pdq enabled and 
committed read last committed isolation level: 
 
tid      name     rstcb            flags    curstk   status 
242      sqlexec  66608740         ---P---  6784     sleeping 
secs: 1     - 
246      nljoin_1 66608ff8         ----R--  1717808992 running- 
247      nljoin_1 666098b0         Y------  496      cond wait 
await_MC1 - 
248      nljoin_1 6660a168         L---R--  1719364656 running- 
249      nljoin_1 6660aa20         Y------  496      cond wait 
await_MC1 - 
250      scan_2.0 6660b2d8         Y------  496      cond wait 
await_MC2 - 
251      scan_2.1 6660bb90         Y------  496      cond wait 
await_MC2 - 
 
 
sqscb info 
scb              sqscb            optofc   pdqpriority 
optcompind  directives 
670621c0         681a8028         0        40          2 
1 
 
Sess       SQL            Current            Iso Lock       SQL 
ISAM F.E. 
Id         Stmt type      Database           Lvl Mode       ERR 
ERR  Vers  Explain 
183        SELECT         clear              LC  Not Wait   0 
0    9.24  Off 
 
Lastly the value of BATCHEDREAD_INDEX from the onstat -c output: 
 
BATCHEDREAD_INDEX   0
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* 12.10 users using Last Committed and PDQ                     * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to IDS-12.10.xC5                                      * 
****************************************************************
Local Fix:


Solution


Problem Fixed In IDS-12.10.xC5


Workaround


not known / see Local fix


Timestamps


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

19.08.2014
16.10.2015
16.10.2015


Problem solved at the following versions (IBM BugInfos)




Problem solved according to the fixlist(s) of the following version(s)


12.10.xC5

FixList



12.10.xC5.W1

FixList