Date: Tue, 27 Feb 2001 21:36:12 -0800 From: Julian Elischer <julian@elischer.org> To: Bruce Evans <bde@zeta.org.au> Cc: John Baldwin <jhb@FreeBSD.ORG>, Leif Neland <leifn@neland.dk>, freebsd-current@FreeBSD.ORG, Gary Jennejohn <garyj@jennejohn.org> Subject: Re: make kernel failure: pecoff: machine/lock.h Message-ID: <3A9C8E4C.C19E7F68@elischer.org> References: <Pine.BSF.4.21.0102281555160.555-100000@besplex.bde.org>
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Bruce Evans wrote:
>
> On Tue, 27 Feb 2001, John Baldwin wrote:
>
> > Ok. It may be that we are overflowing the kernel stack and corrupting the pcb
> > in the process. One idea atm is to move the pcb off of the stack (since it
> > stores persistent data it's a bad place for it anyways) and to add a red zone
> > at the bottom of the stack to catch overflows.
>
> Most of the pcb actually has the same persistence as the kernel stack
> (both mainly store the process's context while the process is in the
> kernel). But it is silly to put the pcb below the stack instead of
> above it. Perhaps the idea is to get a panic sooner when something
> is corrupted.
I have never understood why the context is not ON the stack.
>
> Bruce
>
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