[lkml]   [2005]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?
On Thursday 07 Jul 2005 12:42, Ingo Molnar wrote:
> * Alistair John Strachan <> 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

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).

Is this any help do you?


personal: alistair()devzero!co!uk
university: s0348365()sms!ed!ac!uk
student: CS/CSim Undergraduate
contact: 1F2 55 South Clerk Street,
Edinburgh. EH8 9PP.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-07-07 14:29    [W:0.132 / U:2.312 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site