Reply-To: ew@unixpunx.net
From: ew@unixpunx.net (Eric Weiss)
To: linux-kernel@vger.kernel.org
Subject: Re: kernel BUG
Date: Fri, 28 Jun 2002 12:54:40 -700
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On Thu, 2002-06-27 at 14:23, Chaoyang Deng wrote:
>
>Hi,
>
>I am working on an iSCSI target driver with a Fibre Channel disk. After I
>updated my OS to linux7.3 with kernel 2.4.18-3, I got problem: my driver
>will crash my box. I am not sure if it is a bug in my code or in the
>Qlogic Fibre Channel driver or in the kernel. Could anyone give me a hint?
>

The BUG() is popping in include/asm/pci.h:pci_map_sg(). If either sg_list.address
or sg_list.page is not NULL,  or both are NULL the BUG() is called.  The reason
for this is around 2.4.13-pre2 bounce buffers along with a nasty memcpy where added
in linux/drivers/scsi/scsi_lib.c:scsi_io_completion() to scatterlists for HighMemIO
support, along with two extra members (page & offset) to struct scatterlist in
include/linux/scatterlist.h.

                                               Eric Weiss

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