From owner-freebsd-geom@FreeBSD.ORG  Thu Oct 14 07:21:02 2004
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To: staylor@mrynet.com (User Staylor)
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Thu, 14 Oct 2004 00:21:00 CDT."
             <200410140521.i9E5L06d001096@mrynet.com> 
Date: Thu, 14 Oct 2004 09:21:00 +0200
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Subject: 
	Re: GEOM will panic 6.0-current on userland wrong-length disk reads 
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Do you have rev. 1.63 of sys/geom/geom_io.c  ?

In message <200410140521.i9E5L06d001096@mrynet.com>, User Staylor writes:
>Just discovered (and verified with latest build on 
>current.freebsd.org) that the following will panic
>the new GEOM fdc driver in 6.0-current:
>
># dd if=/dev/fd0 bs=55 
>panic: wrong length 55 for sectorsize 512
>
>And further checking, discovered that ALL disk devices will cause
>a panic:
>
>dd if=/dev/ad0 bs=1234
>panic: wrong length 1234 for sectorsize 512
>
>Perhaps this is geom's way of complaining?  Seems a rather radical
>way to handle non-matching-blocksize reads of disk devices.  A
>simple programming error reading a disk dev node will panic the
>machine.
>
>-scott
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>freebsd-geom@freebsd.org mailing list
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-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.