Subject: Re: panic: ptdi %x
To: Michael K. Sanders <email@example.com>
From: Robert V. Baron <firstname.lastname@example.org>
Date: 11/04/1998 09:55:56
"Michael K. Sanders" <email@example.com> writes:
> I have a 1.3.2 system with an IDE disk that was showing some corrected
> soft errors in my logs, so I wanted to check the disk with dd. I did
> the following:
> dd if=/dev/rwd0f of=/dev/null bs=8192k
> and the system promptly panic'ed. In retrospect, that seems like a
> large block size, but I didn't expect a panic... is this a bug, or
> operator error?
The problem is that pde's are not allocated on demand in 1.3
(sometimes). This means that if you do raw io to a region that
is bigger than 4Meg, you don't stand a chance. If you drop the
size to a meg or so, chances are it will work.