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    SubjectRe: Setting kernel data breakpoints on x86
    On Wed, 2 Nov 2005, Maneesh Soni wrote:

    > On Tue, Nov 01, 2005 at 04:30:26PM -0500, Alan Stern wrote:
    > > I'm trying to debug a rather difficult data-overwriting problem, and it
    > > would be a big help to be able to use a data breakpoint.
    > >
    > > Is there any easy way of doing this? I'd prefer not to use a kernel
    > > debugger, because the address of the breakpoint and the time when it's
    > > needed are determined dynamically.
    > >
    > > Does anybody have a little lightweight procedure for setting one of the
    > > x86's debug registers to point to a particular location in kernel memory
    > > space? I don't care if the whole system crashes when the debug exception
    > > occurs, just so long as I can get a stack trace and find out where the
    > > overwrite comes from.
    > >
    > >
    >
    > Hi Alan
    >
    > Probably watchpoint probes could be useful for this..
    >
    > http://www.ussg.iu.edu/hypermail/linux/kernel/0508.3/1407.html
    >
    > http://sourceware.org/ml/systemtap/2005-q3/msg00097.html

    Hi Maneesh:

    That's exactly what I was looking for. Thanks!

    Alan Stern

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