Re: Panic 2.6.24-3 NMI Watchdog detected LOCKUP on CPU 0

[Ed Tomlinson <edt@aei.ca>]

Thomas,

I have booted many times over the weekend.  I've yet to trigger the watchdog.   Since I used to see problems 
in 1 in 3 or 4 boots,  I think you fixed the problem with patch below.

Thanks
Ed

On March 1, 2008, Thomas Gleixner wrote:
> On Sat, 1 Mar 2008, Ed Tomlinson wrote:
> > Hi,
> > 
> > I have been seeing these since I installed .24 kernels.  It does not seem to matter if I change the clocksource from tsc
> > to apci_pm.  Its happened with all .24 kernels I have tried starting with stock 2.6.24 upto 2.6.24-gentoo-r2 + 2.6.24-3
> > 
> > Ideas?
> 
> Questions first. Is there a particular reason to use idle=poll ?
> 
> Idea: does the patch below help ?
> 
> Thanks,
> 	tglx
> 
> ---
> 
>  arch/x86/kernel/process_64.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> Index: linux-2.6.24/arch/x86/kernel/process_64.c
> ===================================================================
> --- linux-2.6.24.orig/arch/x86/kernel/process_64.c
> +++ linux-2.6.24/arch/x86/kernel/process_64.c
> @@ -212,14 +212,13 @@ void cpu_idle (void)
>  	current_thread_info()->status |= TS_POLLING;
>  	/* endless idle loop with no priority at all */
>  	while (1) {
> +		tick_nohz_stop_sched_tick();
>  		while (!need_resched()) {
>  			void (*idle)(void);
>  
>  			if (__get_cpu_var(cpu_idle_state))
>  				__get_cpu_var(cpu_idle_state) = 0;
>  
> -			tick_nohz_stop_sched_tick();
> -
>  			rmb();
>  			idle = pm_idle;
>  			if (!idle)
> 
>