Re: 2.6.21-rc2-mm2

Con Kolivas
2007-03-06T20:20:26Z

On Wednesday 07 March 2007 01:47, Thomas Gleixner wrote:
> On Wed, 2007-03-07 at 00:24 +1100, Con Kolivas wrote:
> > > printk(KERN_INFO "Time: %s clocksource has been installed.\n",
> > > clock->name);
> > > }
> > >
> > > So clock seems to be NULL, but was accessed before
> > > clocksource_calculate_interval() as well.
> >
> > It seems to be specifically tripping at c->mult after reading c->shift if
> > I'm reading it correctly.
> >
> > Note again, this is qemu, not real hardware and it will likely be giving
> > very unrealistic values for timer calibrations.
>
> I know, but this does not really explain why the
>
> tmp += c->mult/2;
>
> results in a NULL pointer access after
>
> tmp <<= c->shift;

/me shrugs

No idea.

> Does disassembling the code in question give some info ? You might also
> try to look with GDB at it.

Alas it wouldn't mean anything to me, sorry. And qemu doesn't work with gdb on
64bit processes in 32bit userspace even with a 64bit gdb.

--
-ck