Re: [CHECKER] large stack variables (>=1K) in 2.4.4 and 2.4.4-ac8

Andi Kleen
2001-05-25T08:16:19Z

On Fri, May 25, 2001 at 03:20:20PM +1000, Keith Owens wrote:
> >> On a side note, does anyone know if the kernel does checking if the
> >> stack overflowed at any time?
> >
> >You normally get a silent hang or worse a stack fault exception
> >(which linux/x86 without kdb cannot recover from) which gives you instant
> >reboot.
>
> You cannot recover from a kernel stack overflow even with kdb. The
> exception handler and kdb use the stack that just overflowed.

Hmm, I thought it used an own stack using an appropiate gate.
At least on x86-64 I implemented it this way using a static 4K array.

-Andi