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[Qemu-devel] fdc: refactor device creation causes guest kernel panic

From: Stefan Hajnoczi
Subject: [Qemu-devel] fdc: refactor device creation causes guest kernel panic
Date: Wed, 9 Mar 2011 14:34:16 +0000

The following kernel panic occurs when the RHEL6 installer starts on

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa0062ceb>] floppy_ready+0xfb/0x730 [floppy]

For full details see http://pastebin.com/SYE5A6LA.

git-bisect revealed that the following commit causes this panic:

commit 63ffb564dca94f8bda01ed6d209784104630a4d2
Author: Blue Swirl <address@hidden>
Date:   Sat Feb 5 16:32:23 2011 +0000

    fdc: refactor device creation

    Turn fdc_init_isa into an inline function.

    Get floppy geometry directly from the drives.

    Don't expose FDCtrl.

    Signed-off-by: Blue Swirl <address@hidden>

The CMOS value at 0x10 has changed from 0x00 to 0x40 but I have not
located the root cause of the problem.

Blue Swirl: Any thoughts on this bug?


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