netdev - Re: SG_IO with >4k buffer size to iscsi sg device causes "Bad page" panic

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Message-ID: <4640CFC8.9020004@cs.wisc.edu>
Date:	Tue, 08 May 2007 14:30:16 -0500
From:	Mike Christie <michaelc@...wisc.edu>
To:	open-iscsi@...glegroups.com
CC:	netdev@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-iscsi-devel@...ts.sourceforge.net,
	"Qi, Yanling" <Yanling.Qi@....com>, dougg@...que.net,
	James Bottomley <James.Bottomley@...elEye.com>
Subject: Re: SG_IO with >4k buffer size to iscsi sg device causes "Bad page"
 panic

Qi, Yanling wrote:
> Hi All,
> 
> This panic is related to the interactions between scsi/sg.c, iscsi
> initiator and tcp on the RHEL 2.6.9-42 kernel. But we may also have the
> similar problem with open-iscsi initiator. I will explain why we see the

Yeah, this problem should occur in the upstream open-iscsi iscsi code.
open-iscsi works very similar to linux-scsi where it just sends pages
around with sock->ops-sendpage, and it looks like sg uses
__get_free_pages in RHEL's kernel and upstream it uses alloc_pages so
unless there was a change in those functions or the network layer then
we should have a similar problem.
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