linux-kernel - Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

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Message-ID: <646765f40807101559q51fbfc50x8e3466e5f202e0c8@mail.gmail.com>
Date:	Fri, 11 Jul 2008 08:59:20 +1000
From:	"Julian Calaby" <julian.calaby@...il.com>
To:	"Mikulas Patocka" <mpatocka@...hat.com>
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Jens Axboe" <jens.axboe@...cle.com>
Subject: Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

On Fri, Jul 11, 2008 at 07:56, Mikulas Patocka <mpatocka@...hat.com> wrote:
> Hi
>
> I'm getting crashes with InitIO A100u2w controller on Sparc64 (I had to fix
> the endianity issues in the driver, but that's unrelated).
>
> When I examined the crashes, it turned out that SCSI layer passed requests
> with too many segments. The controller has at most 32 SG entries per
> request. It sets shost->sg_tablesize to 32, but despite this, larger
> requests were submitted to it --- this resulted in overwriting random memory
> and crashes.

[snip]

Should this have been CC'd to linux-scsi too? This sounds like it
could be a bug at their end.

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
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