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IDS Forum

RE: 11.5 UC7E crashes

Posted By: Joerg Volz
Date: Tuesday, 20 December 2011, at 2:58 p.m.

In Response To: 11.5 UC7E crashes (KLAUS GLAHN)

Hallo Klaus,

locks a bit like your IDS instance is running out of memory and has problems allocating new segments.

I suggest you call your Informix vendor or our friends from IBM Munich, as your onconfig file locks pretty much like the one out of the box without any adjustments. Our IIUG friends from the states can´t help much, because of german messages in your log file.

At first I suggest to start the engine with much more memory allocated, this way the engine does not have to search for free continuous pieces of free memory all the time. How much memory has your machine?

Good suggestion is also the IDS Reference by Eric Herber, ISBN 978-3868020120 as a pocket reference.

Mit freundlichen Grüßen
Joerg Volz
-----------------------------------------------------------------------------

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of KLAUS GLAHN
Sent: Tuesday, December 20, 2011 8:16 PM
To: ids@iiug.org
Subject: 11.5 UC7E crashes [25681]

Hi,

we have an Informix Server 11.5 UC7E running under Debian Linux. The system
ran fine in no-logging-mode for several years until we switch to logging-mode
to support a new application.

Since then we experience crashes - the database dies with the following
messages from the online.log:

18:09:34 Assert fehlgeschlagen: Bedingung nicht erfüllt (Bad block pointer
0x893fe2c in pool 0x28632028), In (mt_shm_free)
18:09:34 IBM Informix Dynamic Server Version 11.50.UC7E
18:09:34 Wer: Session(137915, hoffmann@tefix, 6734, 0x38e64e80)

Thread(141348, sqlexec, 3ede9f40, 1)

File: mtshpool.c Line: 4193
18:09:34 Aktion: Bitte informieren Sie die technische Unterstützung für IBM
Informix.
18:09:34 stack trace for pid 8244 written to /opt/informix/tmp/af.2c0cc14d
18:09:34 Siehe auch: /opt/informix/tmp/af.2c0cc14d
18:09:36 Bedingung nicht erfüllt (Bad block pointer 0x893fe2c in pool
0x28632028), In (mt_shm_free)
18:09:36 stack trace for pid 8244 written to /opt/informix/tmp/af.2c0cc14d
18:09:36 Assert fehlgeschlagen: No Exception Handler
18:09:36 IBM Informix Dynamic Server Version 11.50.UC7E
18:09:36 Wer: Session(137915, hoffmann@tefix, 6734, 0x38e64e80)

Thread(141348, sqlexec, 3ede9f40, 1)

File: mtex.c Line: 491
18:09:36 Ergebnisse: Exception Caught. Type: MT_EX_OS, Context: mem
18:09:36 Aktion: Bitte informieren Sie die technische Unterstützung für IBM
Informix.
18:09:36 Siehe auch: /opt/informix/tmp/af.2c0cc14d
18:09:38 Starting crash time check of:
18:09:38 1. memory block headers
18:09:38 2. stacks
18:09:38 Found bad memory block; address:29acfc88
18:09:38 mtex.c, line 491, thread 141348, proc id 8244, No Exception Handler.
18:09:39 Der Master-Dämon ist nicht mehr aktiv
18:09:39 PANIC: Attempting to bring system down

I am not an Informix expert, but responsible for the system. The internet is
not helping with these error messages.

I don´t know if this is important or has anything to do with the problem, but
we have this message regularly:
08:28:44 Contiguous shared memory segment allocation failed at 0xb78ee000.
Allocation successful at 0x43800000.
Check SHMBASE is consistent with the value in $INFORMIXDIR/etc/onconfig.std.
If you are using the correct SHMBASE value in your ONCONFIG file, then
consider this message informational only.
08:28:44 Dynamically allocated new virtual shared memory segment (size 8192KB)
08:28:44 Memory sizes:resident:1761624 KB, virtual:139872 KB, no SHMTOTAL
limit

Short extract from our onconfig-file:
SHMBASE 0x44000000L
SHMVIRTSIZE 32656
SHMADD 8192
EXTSHMADD 8192
SHMTOTAL 0
SHMVIRT_ALLOCSEG 0.000000
SHMNOACCESS

Can anybody help me or can give me an advice how to solve this problem?
Or is anybody experiencing similiar problems?

Thanks for reading my long post :-)
Klaus

*******************************************************************************
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IT Handel und Beratung Jörg Volz
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