On Mon, 2010-12-06 at 09:59 +0200, Kai Makisara wrote:
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> On Thu, 2 Dec 2010, Kai Makisara wrote:

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> OK, today I have had some time (national holiday). I think I have tracked 
> down this problem. The patch at the end should fix it. Basically, 
> normalize_buffer() needs to know the order of the pages in order to 
> properly free the pages and update the buffer size. When allocation 
> failed, the order was not yet stored into the tape buffer definition. This 
> does explain the problem after allocation failed.

Thank you, this does indeed look nasty (like a not easily catched bug).

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> Why allocation failed is another problem which has been discussed elsewhere.

I just tonight discovered that Debian's .config has
CONFIG_FUSION_MAX_SGE=40. Right now I'm testing with the mptsas' drivers
maximum of 128 and see if I can reproduce the failure under memory
pressure again. Sorry for not catching this one earlier! After reading
the source, I had the assumption that it already was 128 ...

-- 
Lukas


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