On Thursday 07 Jul 2005 13:15, Alistair John Strachan wrote:
> On Thursday 07 Jul 2005 12:42, Ingo Molnar wrote:
> > * Alistair John Strachan <[email protected]> wrote:
> > > > do you have DEBUG_STACKOVERFLOW and latency tracing still enabled?
> > > > The combination of those two options is pretty good at detecting
> > > > stack overflows. Also, you might want to enable CONFIG_4KSTACKS, that
> > > > too disturbs the stack layout enough so that the error message may
> > > > make it to the console.
> > >
> > > I already have 4KSTACKS on. Latency tracing is enabled, but
> > > STACKOVERFLOW isn't; I'll just reenable everything again until we fix
> > > this. Do you think if I removed the printk() line I might get some
> > > useful information, before it does the stack trace?
> >
> > usually such loops happen if the stack has been overflown and critical
> > information that lies on the bottom of the stack (struct thread_info) is
> > overwritten. Then we often cannot even perform simple printks. Stack
> > overflow debugging wont prevent the crash, but might give a better
> > traceback.
> >
> > Ingo
>
> http://devzero.co.uk/~alistair/oops1.jpeg
>
> I disabled the trace and the STACKOVERFLOW option seems to help; I've got a
> (slightly truncated) oops from the kernel. What happens is that I get an
> oops, then I get a BUG: warning me about the softlock, then I get another
> oops. I'm about to reboot to confirm whether the second oops is identical
> to the first (I suspect that it is).
http://devzero.co.uk/~alistair/oops3.jpeg
This shows the first oops (it's slightly different).
http://devzero.co.uk/~alistair/oops2.jpeg
This shows the BUG: after the first oops
--
Cheers,
Alistair.
personal: alistair()devzero!co!uk
university: s0348365()sms!ed!ac!uk
student: CS/CSim Undergraduate
contact: 1F2 55 South Clerk Street,
Edinburgh. EH8 9PP.
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