linux-kernel - Re: block/bsg.c

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Message-Id: <20070717143434.48836fb8.akpm@linux-foundation.org>
Date:	Tue, 17 Jul 2007 14:34:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: block/bsg.c

On Tue, 17 Jul 2007 22:52:25 +0200
Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:

> ide-{disk,scsi,tape} don't support REQ_TYPE_BLOCK_PC requests et all
> (so attempts to use SG_IO, CDROM_SEND_PACKET and SCSI_IOCTL_SEND_COMMAND
> will result in requests being failed and error messages in the kernel logs).

In my case it results in a completely tits-up machine.  CPU stuck somewhere
spinning with local interrutps disabled.

If you see the log output I sent, I'm suspecting this might be because
this BSG brainfart has exposed underlying bugs in IDE or SCSI.

Note that I saw literally 20,000 lines of output in the bit which I snipped,
so something has gone pretty wild in the handling of these bogus commands.

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