Subject: Re: kern/32191: integer divide fault trap caused by the ata driver
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: Manuel Bouyer <bouyer@antioche.eu.org>
List: netbsd-bugs
Date: 11/29/2005 20:19:02
The following reply was made to PR kern/32191; it has been noted by GNATS.
From: Manuel Bouyer <bouyer@antioche.eu.org>
To: gnats-bugs@NetBSD.org
Cc: kern-bug-people@NetBSD.org, gnats-admin@NetBSD.org,
netbsd-bugs@NetBSD.org
Subject: Re: kern/32191: integer divide fault trap caused by the ata driver
Date: Tue, 29 Nov 2005 21:18:41 +0100
On Tue, Nov 29, 2005 at 03:02:01PM +0000, matthias.christian@tiscali.de wrote:
> >Number: 32191
> >Category: kern
> >Synopsis: integer divide fault trap caused by the ata driver
> >Confidential: no
> >Severity: serious
> >Priority: high
> >Responsible: kern-bug-people
> >State: open
> >Class: sw-bug
> >Submitter-Id: net
> >Arrival-Date: Tue Nov 29 15:02:00 +0000 2005
> >Originator: Matthias-Christian Ott
> >Release: netbsd-3
> >Organization:
> >Environment:
> >Description:
> I get an "integer divide fault trap" caused by the ata driver when booting my computer [0] [1]. See the screenshots for more details.
>
> [0] http://metawire.org/~matthias-christian-ott/pub/netbsd/netbsd-3/integer-divide-fault-trap-0.jpg
> [1] http://metawire.org/~matthias-christian-ott/pub/netbsd/netbsd-3/integer-divide-fault-trap-1.jpg
Basically wdcprobe1 calls i8254_delay which calls gettick.
The fault is at gettick+0x1c. From gdb this would be write_eflags(ef).
I can't see how this can cause a integer divide fault trap.
Even in i8254_delay I can't see how we could get a divide by 0 here.
--
Manuel Bouyer <bouyer@antioche.eu.org>
NetBSD: 26 ans d'experience feront toujours la difference
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