INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

When a problem is encountered trying to process some I/O
requests the server can product the following type of assertion
messages in MSGPATH file:

08:19:08  Assert Warning: I/O read chunk 272, pagenum 5346364,
pagecnt 4 --> errno = 2
08:19:08  IBM Informix Dynamic Server Version 11.70.FC9X1
08:19:08   Who: Session(660, user@host, -1, 4a8be56f8)
                Thread(184827, scan_2.0, 49dd9f728, 1)
                File: rsbuff.c Line: 5634
08:19:08   Action: Please notify IBM Informix Technical Support.
08:19:08  stack trace for pid 1066 written to /path/af.d5e30e3c
08:19:08   See Also: /path/af.d5e30e3c
08:19:08  I/O read chunk 272, pagenum 5346364, pagecnt 4 -->
errno = 2

This message indicates errno is 2, however, when looking the
contents of the af file we see the following:

08:22:35  mt_aio_wait(4a2ab5c68)
08:22:35  chunkio(56, 0x2a47c4000, 0x3f1ec0, 4, 0x49df25228, 33,
1) errno 9
AIOREQ *a


This is actually correctly reporting errno 9 from the actual
AIOREQ.  This was addressed as part of the fix of idsdb00495796.
However, that defect seemed to not address the errno reported in
the MSGPATH output.

Additionally, this message implies a read failure, when in the
process of debugging, the actual failure occurred when
attempting to open the chunk.  So there is no indication of a
failing open, and due to the failing open, the server is
manually setting errno to 9/EBADF so there is no trace of the
error being reported by the open.

****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC7.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when     *
* available).                                                  *
****************************************************************

****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC7.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when     *
* available).                                                  *
****************************************************************

Fixed in Informix Server 12.10.xC15 and 14.10.xC7.

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

28.09.2020
23.08.2021
23.08.2021