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Date:      Mon, 26 Feb 2001 09:30:47 -0600
From:      Greg Lehey <grog@lemis.com>
To:        Peter Blok <Peter.Blok@inter.NL.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: DDB watch
Message-ID:  <20010226093046.A15164@sydney.worldwide.lemis.com>
In-Reply-To: <000501c09f75$35b888d0$8a02a8c0@ntpc>; from Peter.Blok@inter.NL.net on Sun, Feb 25, 2001 at 10:52:11PM %2B0100
References:  <000501c09f75$35b888d0$8a02a8c0@ntpc>

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On Sunday, 25 February 2001 at 22:52:11 +0100, Peter Blok wrote:
> Hi,
>
> I was trying to setup a "watch" in DDB. When it hits it, the kernel
> reboots.  Am I doing something wrong or isn't it working. I start up
> with boot -d set a breakpoint somewhere, hits breakpoint and set
> watchpoint. After the continue it crashes, without a backtrace. Just
> a black screen and reboot.

There are places where you can't set a breakpoint.  An obvious place
is in the ddb code: if you hit a breakpoint there, you're going to
recurse to the top of the stack and crash.  There are other less
obvious places, and I suspect that's what you have hit.

Greg
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