Re: early exception error

[david]

On Wed, 31 Dec 2008, Cyrill Gorcunov wrote:

> [david@xxxxxxx - Wed, Dec 31, 2008 at 11:12:12AM -0800]
> > On Wed, 31 Dec 2008, Cyrill Gorcunov wrote:
> >
> > > [david@xxxxxxx - Tue, Dec 30, 2008 at 05:39:29PM -0800]
> > > > On Wed, 31 Dec 2008, Andi Kleen wrote:
> > > >
> > > > > david@xxxxxxx writes:
> > > > > > doing a grep through System.map for the address that appears in the
> > > > > > error returns nothing
> > > > >
> > > > > This might be obvious, but you can't grep directly for these addresses
> > > > > because System.map contains the starting addresses of functions only
> > > > > and normally the reported address is somewhere in the middle of a
> > > > > function. So you instead have to look for the highest number lower or equal
> > > > > the address from the exception.
> > > >
> > > > thanks, this was not obvious to me
> > > >
> > > > the -2 error maps to
> > > >
> > > > ffffffff8099e4c1 T free_bootmem_node
> > > > ffffffff8099e4e5 t alloc_bootmem_core
> > > > ffffffff8099e774 t ___alloc_bootmem_nopanic
> > > >
> > > >
> > > > the first error maps to
> > > >
> > > > ffffffff809c2de4 T free_bootmem_node
> > > > ffffffff809c2e08 t alloc_bootmem_core
> > > > ffffffff809c3097 t ___alloc_bootmem_nopanic
> > > >
> > > >
> > > > so it looks like this is in alloc_bootmem_core in both cases.
> > > >
> > > > David Lang
> > >
> > > Along with Andi's proposed earlyprintk=vga I think
> > > bootmem_debug option could be usefull here too.
> >
> > adding bootmem_debug creates so much additonal output that the oops
> > scrolls off the screen (except the last 'paragraph' of it)
> >
> > it looks like it's individual items being allocated (trying to scan it as
> > it scrolled by)
>
> on the picture you sent me i noticed the message
> "Your memory is not aligned you need to rebuild your
> kernel with bigger NODEMAP SIZE shift=20" and then
> srat code complains about "No NUMA code hash function found"
> which looks a bit scary. Btw, could you post this picture
> on some public resource so NUMA people could check it?

http://linux.lang.hm/linux/IMG00030.jpg

I'll try rebuilding with a bigger nodemap size and let you know

David Lang
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