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IDS Forum

Re: Reasons: Crashes of all supported IDS versions

Posted By: Fernando Nunes
Date: Monday, 23 July 2012, at 12:01 p.m.

In Response To: Re: Reasons: Crashes of all supported IDS versions (VICENTE SALVADOR)

On Mon, Jul 23, 2012 at 11:43 AM, VICENTE SALVADOR <vsalvador@deister.es>wrote:

> As told by Art, crashes are very rare but you can find them...
>
> Bugs normally becomes on assertions, but the engine still works.
>
> I've found crashes on some IDS instances related to ER or RSS and also
> related
> with blobs, but it's very dificult to expose them in a list, because there
> are
> no a simple cause-efect.
>
> IDS is a very solid and reliable engine, so getting it to crash is very
> very
> difficult and it's not easy to know the real cause for it.
>
>
I wouldn't like to pass the image that it's hard to find the cause for a
crash. As I explain why, you may get the impression that I have a lot of
experience with them, and that would contradict the point about Informix
reliability. Please keep in mind that I work with Informix since 1991 and
I'm at Informix/IBM since 1998, with close interaction with technical
support although officially I don't work for TS. And typically people don't
usually call tech support just to say "hello, everything is running fine" :)

In most cases, when we hit an Assert Fail, a quick search in IBM KB for
the functions shown in the stack trace can give a very close match for the
bug (assuming it's a known bug).
Sometimes the functions in the stack trace may not be related to the cause
itself (specially with memory corruption issues) and that can make things
harder. And eventually we may find a new (never reported) bug.

Also, the kind of operation being done can give us very good clues.

In my experience I'd say that only once we were not able to find the cause.
And when I say "we" I mean myself, the customers and specially the tech
support team which must be praised in these situations.
But bare in mind that their job cannot lead to a successful conclusion
without the help of the customers. I know that some customers complain
about their interactions with tech support, and surely some times that may
have reasons to do so, but my most frustrating experiences with problem
analysis happen when I find a PMR matching my case which was closed due to
lack of input from the customer. Believe me, this happens many times. Why?
Because for situations that happen only once, usually people have other
things to do and can't spend the time investigating what is not seen as a
problem anymore.

Having said all these, it's obvious that not all problems are equal. I've
faced real challenges while looking at bugs (in general and not only assert
fails).
But it's important to all of us that use the product that we do our best to
find the root causes. The bugs shouldn't be there of course, but we all
know that all software has them, and usually they don't fix themselves :)

Regards

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--20cf3005dcb2aa532b04c5815be1

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