25594 error

I have been receiving the following error in a 4gl program that prints shipping extract labels in a grocery warehouse. -25594 Shared Memory client failed to alert OnLine server for service. Memory corruption usually causes this problem, or the operating system cannot perform a semaphore operation. Report the problem to the OnLine database administrator. The DBA might need to restart INFORMIX-OnLine Dynamic Server or perform a reboot of the entire system. The error is trapped within the 4gl program but never shows itself in the online log. It causes the program to hang as if it is stuck in a loop. It's description leads me to believe that it would cause the engine to panic and shutdown if it occurred. Not only does it not affect the engine, but, we just restart the 4gl process and it runs to completion without a bounce of the engine. We are running 7.24.UC5 with the x8 patch on AIX 4.3.2 on a 12 way IBM S70. I used onmode -I 25594 to try to capture the error and cause an assert failure, but the engine never flinched when the error occurred. Proof to me that the engine is never seeing the error. The software vendor made the following recommendations : 1) The problem is most likely caused by the communication between Informix and Unix. The RESIDENT variable in the onconfig_prd is set to "0" while the KAIOON variable is set to "1". The result is asynchronous I/O between Unix and Informix. If the correct patches and drivers are not installed to support asynchronous I/O then the setting for KAIOON should be set to "0" to match the RESIDENT variable. Otherwise it is possible for the memory swap to cause an overwrite of the address space, resulting in the returned error code from Informix. It is felt that this would be the best course of action. 2) Another possible solution is to change the SHMADD variable in the $INFORMIXDIR/etc/onconfig_prd file. The setting could be increased from 33KB to 45KB. This would probably be the second best course of action. 3) The application code is not the root cause of the shared memory failure error returned from Informix, however, it may be possible to prevent the error from occurring through programming. The error could possibly be prevented by adding code in the program which will set the read of the tables by Informix to 'cursor stability'. This change would have a negative impact on the speed of the label printing program and would not be recommended. The RESIDENT option is not supported on AIX and KAIO is setup and running on the box. As for the SHMADD idea, this machine not only never adds to the virtual portion, it barely touches what it has allocated to begin with (in dire need of tuning i know). And the last option really isn't an option as this machine runs like a dog already. Does anyone have any other ideas on this?