Re: [debug patch] printk: Add a printk killswitch to robustify NMIwatchdog messages

[Arne Jansen]

On 05.06.2011 18:35, Arne Jansen wrote:
> On 05.06.2011 18:07, Arne Jansen wrote:
> > On 05.06.2011 17:32, Ingo Molnar wrote:
> > > one more thing, could you please add this call:
> > >
> > > debug_show_all_locks();
> > >
> > > to after the WARN(), in watchdog.c?
> > >
> > > Please surround the whole printout portion by the
> > > spin_lock()/unlock() protection code i suggested, full-lock-state
> > > printouts are slow and other CPUs might start printing their NMI
> > > ticks ...
> > >
> > > With the all-locks-printed output we can double check what locks are
> > > held.

btw, the output posted earlier also contains some
BUG: spinlock lockup.


> > Hm, on first try:
> >
> > INFO: lockdep is turned off.
> >
> > Recompiling...
>
> same after a full recompile.
>
> # grep LOCKDEP .config
>
> CONFIG_LOCKDEP_SUPPORT=y
> CONFIG_LOCKDEP=y
> # CONFIG_DEBUG_LOCKDEP is not set
>
>
> -Arne
>
> > > Thanks,
> > >
> > > Ingo
> > > --
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