INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

The following problem was reported in a PRI/RSS pair running a
special build of IDS 12.10.FC10 on linux x86_64
and was reproduced on the same platform running 12.10.FC14 but
this is likely a platform independent defect.

If you run the following commands to manually extend a chunk
when SP_AUTOEXPAND is off:

EXECUTE FUNCTION TASK ("modify chunk extendable", "2");
EXECUTE FUNCTION TASK ("modify chunk extend", "2", "1000000");
EXECUTE FUNCTION TASK ("modify chunk extendable off", "2");

There is a window such that if the mon_low_storage task runs, it
may also start a chunk extend
which ends after turning chunk extendable off.  This can cause a
logical log replay error on a secondary
when we try to roll forward through the chunk extend when the
chunk is no longer extendable.

01/28/21 14:49:10  Assert Failed: Logical log replay error.
01/28/21 14:49:10  IBM Informix Dynamic Server Version
12.10.FC14
01/28/21 14:49:10   Who: Session(45, informix@hostname, 0,
0x45c493f8)
                Thread(79, xchg_2.0, 45c17128, 9)
                File: rsprecvr.c Line: 7968
01/28/21 14:49:10   Results: The secondary server cannot
continue.

14:49:10  Stack for thread: 79 xchg_2.0

 base: 0x0000000047f9d000
  len:   102400
   pc: 0x0000000001410459
  tos: 0x0000000047fb4c00
state: running
   vp: 9

0x0000000001410459 (/work2/prod/12.10.FC14/bin/oninit) afstack
0x0000000001413431 (/work2/prod/12.10.FC14/bin/oninit) afhandler
0x0000000001413a92 (/work2/prod/12.10.FC14/bin/oninit)
afcrash_interface
0x0000000000eb68e3 (/work2/prod/12.10.FC14/bin/oninit)
rollfwd_error
0x0000000000f125f4 (/work2/prod/12.10.FC14/bin/oninit)
rlogm_redo
0x0000000000ec459d (/work2/prod/12.10.FC14/bin/oninit)
scan_logredo
0x0000000000ec540e (/work2/prod/12.10.FC14/bin/oninit)
next_lscan
0x000000000146ea00 (/work2/prod/12.10.FC14/bin/oninit)
producer_thread
0x0000000001448997 (/work2/prod/12.10.FC14/bin/oninit) startup

****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC6.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC6 (when available).                                  *
****************************************************************

Disabling the mon_low_storage task can be a suitable workaround
when chunks are manually extended.

****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC6.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC6 (when available).                                  *
****************************************************************

Fixed in Informix Server 12.10.xC15 and 14.10.xC6.

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

28.01.2021
13.05.2021
13.05.2021