Date: Fri, 27 Feb 1998 18:14:02 -0800 From: Mike Smith <mike@smith.net.au> To: Greg Lehey <grog@lemis.com> Cc: Mike Smith <mike@smith.net.au>, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: Kernel debugging: what's going on here? Message-ID: <199802280214.SAA00165@dingo.cdrom.com> In-Reply-To: Your message of "Sat, 28 Feb 1998 12:32:53 %2B1030." <19980228123253.24049@freebie.lemis.com>
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> On Fri, 27 February 1998 at 17:56:46 -0800, Mike Smith wrote: > > Yes, I noticed. But rewriting the bp on the fly is not uncommon; quite > > a few device drivers do it, it wouldn't surprise me if it wasn't done > > elsewhere rather than cloning the original. > > Sure, all sorts of things modify the buffer header. But you're still > missing the point: the processor is stopped here, it's in the > debugger. No instructions were executed between the two views. You > might just as well take a look at a dump. Since when does the content > of memory differ depending on where you look at it from? Whoops. OK, are we sure that "bp" points to the same type in both cases? And more importantly, that bp->b_vp is expected to be the same type? (Yes, this is *really* clutching at straws). There's not much else short of a GDB bug that I can think of that would cause this. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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