Date: Mon, 19 Jan 2004 09:15:13 -0800
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: Atro.Tossavainen@helsinki.fi
Cc: atossava@cc.helsinki.fi, linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: Panic reading EFS CDs on SCSI CD drives through loop
Message-Id: <20040119091513.073d66fc.rddunlap@osdl.org>
In-Reply-To: <200401191145.i0JBjOsv013637@kruuna.Helsinki.FI>
References: <200401191145.i0JBjOsv013637@kruuna.Helsinki.FI>
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On Mon, 19 Jan 2004 13:45:24 +0200 (EET) Atro Tossavainen <atossava@cc.helsinki.fi> wrote:

| [1.] Reading files from EFS CD through loop-mounted SCSI CD causes panic
| 
| [2.] I am attempting to read Silicon Graphics IRIX installation CDs on
|      SCSI CD drives, either real SCSI or emulated IDE-SCSI drives.
| 
|      Since SCSI CD-ROMs can't set blocksize (IDE-SCSI emulated drives
|      included), I would usually do this with an IDE drive, disabling
|      ide-scsi temporarily if applicable.  However, the following article
| 
|      http://groups.google.fi/groups?selm=8765hq3j2u.fsf%40ID-48333.user.dfncis.de
| 
|      claims that by using the loop interface, it should be possible to
|      use EFS CDs with SCSI drives, too.
| 
|      I have tried this as follows:
| 
|      losetup /dev/loop0 /dev/scd0
|      mount -r -t efs /dev/loop0 /cdrom
|      cd /cdrom
|      tar cf - . | tar xv -C/somewhere/else -f-
| 
|      It reads a few files, then panics on a large file.  If I am running
|      X11, the only symptom I see is that the machine freezes totally and
|      the Caps Lock and Scroll Lock lights on the keyboard start blinking.
|      If I'm in the text console, it displays the message:
| 
| Kernel panic: scsi_free:Trying to free unused memory

Are there some other messages associated with this, like
a BUG or stack dump?  Those could be helpful.

--
~Randy
Everything is relative.
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