[ale] Strange kernel message

[James P. Kinney III]

Ah Ha! RTFM! In the kernel docs is a file called nmi_watchdog.txt. NMI
is Non Maskable Interupt. It is found on SMP machines, which I am using.

So it is used to help debug SMP kernels. But I am not running in KDB
mode so it looks like a processor just hard locked but the other cpu is
still running as there is no other message in the file.

I thought if one cpu locked, the entire kernel would crash. 

Or do I just have a flaky cpu that simulated an NMI event?

On Fri, 2002-09-20 at 13:59, James P. Kinney III wrote:
> OK. I plugged through the kernel sources. traps.c generated the kernel
> log entry.
> 
> static void unknown_nmi_error(unsigned char reason, struct pt_regs *
> regs)
> {
> #ifdef CONFIG_MCA
>         /* Might actually be able to figure out what the guilty party
>         * is. */
>         if( MCA_bus ) {
>                 mca_handle_nmi();
>                 return;
>         }
> #endif
> #ifdef  CONFIG_KDB
>         (void)kdb(KDB_REASON_NMI, reason, regs);
> #endif  /* CONFIG_KDB */
>         printk("Uhhuh. NMI received for unknown reason %02x.\n",
> reason);
>         printk("Dazed and confused, but trying to continue\n");
>         printk("Do you have a strange power saving mode enabled?\n");
> }
> 
> 
> So, I'm not on an MCA bus system. Looking for what NMI is. KDB is not
> enabled. 
> 
> On Fri, 2002-09-20 at 13:49, James P. Kinney III wrote:
> > This was in my log today. I've NEVER seen anything like it.
> > 
> > 
> > Sep 20 11:55:15 castle kernel: Uhhuh. NMI received for unknown reason
> > 31.
> > Sep 20 11:55:15 castle kernel: Dazed and confused, but trying to
> > continue
> > Sep 20 11:55:15 castle kernel: Do you have a strange power saving mode
> > enabled?
> > 
> > 
> > Unfortunately, I had stepped out for lunch and don't know if the power
> > did blink or if my power supply is being weird.
> > 
> > -- 
> > James P. Kinney III   \Changing the mobile computing world/
> > President and CEO      \          one Linux user         /
> > Local Net Solutions,LLC \           at a time.          /
> > 770-493-8244             \.___________________________./
> > 
> > GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> > <jkinney at localnetsolutions.com>
> > Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7 
> > 
> > 
> -- 
> James P. Kinney III   \Changing the mobile computing world/
> President and CEO      \          one Linux user         /
> Local Net Solutions,LLC \           at a time.          /
> 770-493-8244             \.___________________________./
> 
> GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> <jkinney at localnetsolutions.com>
> Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7 
> 
> 
-- 
James P. Kinney III   \Changing the mobile computing world/
President and CEO      \          one Linux user         /
Local Net Solutions,LLC \           at a time.          /
770-493-8244             \.___________________________./

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7 



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