Re: Can NMI drop a hanging FreeBSD kernel into DDB?

[FTG staff]

* Alfred Perlstein <[EMAIL PROTECTED]> [000505 12:21] wrote:
> > * Jin Guojun <[EMAIL PROTECTED]> [000505 12:03] wrote:
> > > Hi,
> > > 
> > > I am currently experimenting kernel hanging problem even through I have 
> > > compiled the kernel with DDB enabled.
> > > 
> > > How can I make a hanging kernel into DDB? Will grounding the NMI do it?
> > > 
> > > Thanks for any suggestions,
> > 
> > That's a bit extreme.
> > 
> > hit ctrl+alt+esc on the console, or send a serial break if using
> > a serial console, make sure you have BREAK_TO_DEBUGGER if you're
> > using a serial console.
> 
> Forgot to mention that an NMI will also work.
> 
> -Alfred

In a normal operation, both work well. When system hangs, neither of them
works. It looks that system is in some wiered status.

Does any one happen to know how to trace this kind of problem?

        -Jin



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