Re: [RFC][PATCH] timers fixes/improvements

[George Anzinger <george@mvista.com>]

I wonder if this problem might benifit from the "breakpoint on write" capability 
in kgdb.  If you are using the kgdb in the mm patch, look in 
Documentation/i386/kgdb/gdbinit.hw at the hwwbrk macro.  You will, of course, 
have to source this file from gdb to load the macro.  Then you can use the gdb 
command: help hwwbrk to get info on how to use it.

If the location is not written to too often this should help find the offender.

George
--

Christoph Lameter wrote:
> On Tue, 10 May 2005, Oleg Nesterov wrote:
>
>
> > > There is no corruption around ptype_all as you can see from the log. There
> > > is a list of hex numbers which are from ptype_all -8 to ptype_all +8.
> > > Looks okay to me.
> >
> > Still ptype_all could be accessed (and corrupted) as ptype_base[16].
> >
> > Christoph, could you please reboot with this patch?
>
>
> Ok. I added padding before and after ptype_all.
> With padding the problem no longer occurs.
>
> However, if the padding is put before ptype_base and after ptype_all
> then the problem occurs.
>
> So it looks like this is due to writes intended for ptype_base going
> out of bounds. However, there nothing in the code in net/core/dev.c
> that would allow this to happen. Also why is the list head set
> to 0x10:0x10?
>
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--
George Anzinger   george@mvista.com
High-res-timers:  http://sourceforge.net/projects/high-res-timers/
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