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    SubjectRe: [CHECKER] large stack variables (>=1K) in 2.4.4 and 2.4.4-ac8
    Date
    On Fri, 25 May 2001 01:33:03 +0200, 
    Andi Kleen <ak@suse.de> wrote:
    >On Thu, May 24, 2001 at 05:08:40PM -0600, Andreas Dilger wrote:
    >> I'm curious about this stack checker. Does it check for a single
    >> stack allocation >= 1024 bytes, or does it also check for several
    >> individual, smaller allocations which total >= 1024 bytes inside
    >> a single function? That would be equally useful.
    >
    >At one time someone had a script to grep objdump -S vmlinux for the
    >stack allocations generated by gcc and check them.

    ftp://ftp.ocs.com.au/pub/kernel.stack.gz. ix86 specific, probably gcc
    specific and it only picks up code that you compile. The Stanford
    checker is much better.

    >> 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.

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