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

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Message-Id: <200803010939.00229.edt@aei.ca>
Date:	Sat, 1 Mar 2008 09:38:57 -0500
From:	Ed Tomlinson <edt@....ca>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Panic 2.6.24-3 NMI Watchdog detected LOCKUP on CPU 0

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 ?

For another issue Ingo suggested using 'nmi_watchdog=2 idle=poll' to get the nmi_watchdog working.  I can remove it
if you think it will help.

> Idea: does the patch below help ?

I'm rebuilding any will let you know.  It may take a while to trigger.

Thanks for the prompt response!
Ed

> 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)
> --
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