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Informix - Problem description

Problem IT38689 Status: Closed

LOOPING "WARNING: MT_AIO_WAIT: ERRNO == EINVAL OPERATION = 3" MESSAGE WHEN
ADDING RAW CHUNK WHEN SIZE+OFFSET IS TOO LARGE

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
When adding a raw chunk and specifying a size+offset that is
larger than the raw device, it is considered expected behavior
to see one iteration of this message in the onconfig file:

WARNING: mt_aio_wait: errno == EINVAL operation = 3
Assert Warning: WARNING: mt_aio_wait: errno == EINVAL
IBM Informix Dynamic Server Version 12.10.FC14
Who: Session(, informix@host, ...)
        Thread(, onspace, ...)
        File: aio_gskit.c Line: 3235
See Also: /path/af....
WARNING: mt_aio_wait: errno == EINVAL

However, in certain configurations, the chunk addition can loop
for an extended period of time with many of the above messages
in MSGLOG.  The stack for this scenario resembles:

(from 12.10.FC14 on Linux)
0x0000000001410459 (oninit) afstack
0x0000000001413431 (oninit) afhandler
0x0000000001413b52 (oninit) afwarn_interface
0x00000000013f19c7 (oninit) mt_aio_wait
0x00000000013f42d2 (oninit) mt_aio_start
0x00000000013f46dd (oninit) mt_aio_read
0x0000000000e767ec (oninit) verchunkx
0x0000000000e6933b (oninit) chkstat_be
0x0000000000e69964 (oninit) chkfields
0x0000000000e6bdc2 (oninit) add_chunk
0x0000000000e6fa0f (oninit) onspace
0x000000000154290b (oninit) spawn_thread
0x0000000001401c70 (oninit) th_init_initgls
0x0000000001448997 (oninit) startup


It seems as if this only impacts 12.10.xC13+ and 14.10.xC2+.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC8.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC8.                        *
****************************************************************
Local Fix:
Possible workarounds:
1.  Move socket poll threads to NET VPs.
2.  Set onconfig parameter DIRECT_IO to 1.  This may still
produce more than one error.
3.  Note the value of AFWARN from onstat -g ras (likely 0x401),
run onmode -wm AFWARN=0x800, add the raw chunk(s), then set
AFWARN
back to the original value with onmode -wm AFWARN=0x401.
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC8.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC8.                        *
****************************************************************
Comment
Fixed in Informix Server 14.10.xC8.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
12.10.2021
07.04.2022
07.04.2022
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)