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SubjectRe: linux-next: Tree for June 11
On Tue, 15 Jun 2010 18:56:37 +0930
Rusty Russell <rusty@rustcorp.com.au> wrote:

> On Sat, 12 Jun 2010 09:01:24 am Andrew Morton wrote:
> > On Fri, 11 Jun 2010 14:17:38 +1000
> > Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > > I have created today's linux-next tree at
> > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > > (patches at http://www.kernel.org/pub/linux/kernel/v2.6/next/ ).
> >
> > Rusty broke your kernel!
> >
> > oops: http://userweb.kernel.org/~akpm/IMG_20100611_155611.jpg
> >
> > config: http://userweb.kernel.org/~akpm/stuff/config-akpm2-small.txt
> >
> > (gdb) l *0xffffffff8105f9fb
> > 0xffffffff8105f9fb is in get_ksymbol (kernel/module.c:2784).
> > 2779 if (mod->symtab[i].st_shndx == SHN_UNDEF)
> > 2780 continue;
> > 2781
> > 2782 /* We ignore unnamed symbols: they're uninformative
> > 2783 * and inserted at a whim. */
> > 2784 if (mod->symtab[i].st_value <= addr
> > 2785 && mod->symtab[i].st_value > mod->symtab[best].st_value
> > 2786 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
> > 2787 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
> > 2788 best = i;
>
> Hmm, I can't reproduce this :( I'm only 32 bit here, have to dig out my
> 64-bit machine tomorrow.
>
> One wonders why we're in get_ksymbol at all. Has something already gone
> horribly wrong?

Dunno - maybe it got into get_ksymbol() because something oopsed, and
oops tracing uses get_ksymbol(). There's no stack trace because stack
tracing uses get_ksymbol().

Anyway I retested next-20100623 and the verdict is ... you still suck!

I bisected it down to 4624469822455b4accc886557f6c997ccdd59066
("module: kallsyms functions take struct load_info"). I couldn't see
anything obviously wrong with it, but there's something screwy in
there..

<mooches off to bisect Yet Another Hang>


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