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Informix - Problem description

Problem IT34031 Status: Closed

CDRNS THREAD CAN GET STUCK CONTINUALLY RUNNING AFTER SPOOLING WITH
LOOPBACK REPL2SPL REPLICATION

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
An instance configured with loopback replication and a repl2sp
replicate using the --jsonsplname option
that starts spooling can lead to its CDRNsT2 thread stuck
continually looping looking for a transaction
over and over in same sblob.

The CDRNsT2 thread will yield and can migrate to different CPU
VPs but it will continue to run.

If you pstack your CPU VPs you will catch the CDRNsT2 thread
with various stacks but always with stack
foundations that look like:
#7  0x0000000001210e2e in rqmGetBuffer ()
#8  0x00000000011ed2ca in queuerGetMessage ()
#9  0x000000000123129b in rapGetNextMsg ()
#10 0x0000000001231a16 in nifSend ()
#11 0x000000000122df4e in nifiGenericStart ()
#12 0x000000000115e039 in cdrTrampolineThread ()
#13 0x00000000014d5cf2 in th_init_initgls ()
#14 0x000000000151c00f in startup ()

Examples of various stacks:

#0  0x0000000000e244a3 in rsbegin ()
#1  0x000000000083369f in sqisbegin ()
#2  0x0000000000a294d5 in sq_lo_readwithseek ()
#3  0x0000000001206877 in cdr_db_sbreadwithseek ()
#4  0x000000000120b7c0 in rqmSbRead_2 ()
#5  0x000000000120c25a in rqmSbRead ()
#6  0x00000000012103ec in rqmGetNextBufferFromSpool ()
#7  0x0000000001210e2e in rqmGetBuffer ()
#8  0x00000000011ed2ca in queuerGetMessage ()
#9  0x000000000123129b in rapGetNextMsg ()
#10 0x0000000001231a16 in nifSend ()
#11 0x000000000122df4e in nifiGenericStart ()
#12 0x000000000115e039 in cdrTrampolineThread ()
#13 0x00000000014d5cf2 in th_init_initgls ()
#14 0x000000000151c00f in startup ()

#0  0x0000000000e9f868 in buffget ()
#1  0x0000000000e4eef2 in bt_fast_buffget ()
#2  0x0000000000e53f94 in btsearch ()
#3  0x0000000000df419f in kposition ()
#4  0x0000000000df8500 in rsstart ()
#5  0x00000000015c0133 in fmstart ()
#6  0x0000000001205057 in cdr_db_read_internal ()
#7  0x00000000012108a9 in rqmSbOpen.constprop.19 ()
#8  0x0000000001210e14 in rqmGetBuffer ()
#9  0x00000000011ed2ca in queuerGetMessage ()
#10 0x000000000123129b in rapGetNextMsg ()
#11 0x0000000001231a16 in nifSend ()
#12 0x000000000122df4e in nifiGenericStart ()
#13 0x000000000115e039 in cdrTrampolineThread ()
#14 0x00000000014d5cf2 in th_init_initgls ()
#15 0x000000000151c00f in startup ()
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC5.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 14.10.xC5.                         *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
27.08.2020
07.12.2020
07.12.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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