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Informix - Problem description

Problem IT07002 Status: Closed

CDRSPOOL4ALT THREAD CAN DEADLOCK WITH CDRGFAN ON CDR_GC LOCK, BLOCKING
ALTER TABLE AS WELL AS WHOLE ER

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
An ALTER TABLE on a replicated table internally would create a 
CDRSpool4Alt thread for advancing the ER replay position to the 
position of the current transaction.  That thread would spool 
the send queue and/or sit waiting on the replay position to 
advance  -  all while the ALTER TABLE holds the CDR_GC lock. 
 
ALTER session: 
 
Stack for thread: 4444659 sqlexec 
 base: 0x0000000177034000 
  len:   135168 
   pc: 0x000000010122fb70 
  tos: 0x00000001770517f1 
state: join wait 
   vp: 21 
 
 yield_processor_mvp 
 mt_join 
 cdrInvokeForceSpool4AlterMode 
 dac_altmode_on 
 SetCDRAltMode          << has gcLock()'ed the GC (CDR_GC) 
 cdrDDLSetAltMode 
 cdrDDLAlterTablePreDDL 
 cdrPreDDLCallBack 
 ddalter 
 aud_ddalter 
 excommand 
 sq_execute 
 sqmain 
 listen_verify 
 
Stack for thread: 4446885 CDRSpool4Alt 
 base: 0x000000016620d000 
  len:   69632 
   pc: 0x000000010122fb70 
  tos: 0x000000016621d2f1 
state: sleeping 
   vp: 22 
 
 yield_processor_mvp 
 cdrSpoolSendQ4AlterMode 
 th_init_initgls 
 startup 
 
Now one of the threads involved in getting the replay position 
moved, the CDRGfan thread, can end up in the following activity 
-  having to wait on that very CDR_GC lock: 
 
Stack for thread: 145 CDRGfan 
 base: 0x0000000112872000 
  len:   69632 
   pc: 0x000000010122fb70 
  tos: 0x0000000112880571 
state: cond wait 
   vp: 16 
 
 yield_processor_mvp 
 mt_wait 
 gcLock 
 grid_lockGC 
 gauto_processRemasterRepl 
 grid_processEROp 
 grprF_processGridOps 
 grouperFanOutThread 
 cdrTrampolineThread 
 th_init_initgls 
 startup
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to IBM Informix Server 12.10                          * 
****************************************************************
Local Fix:


Solution


Problem Fixed In IBM Informix Server 12.10


Workaround


not known / see Local fix


Timestamps


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

05.02.2015
16.10.2015
16.10.2015


Problem solved at the following versions (IBM BugInfos)


12.10.0



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


12.10.xC5

FixList



12.10.xC5.W1

FixList