From owner-freebsd-hackers  Fri May  5 21:54:34 2000
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To: Jin Guojun (FTG staff) <jin@george.lbl.gov>
Subject: Re: Can NMI drop a hanging FreeBSD kernel into DDB? 
Cc: bright@wintelcom.net, hackers@FreeBSD.ORG
In-reply-to: Your message of "Fri, 05 May 2000 12:50:34 PDT."
		<200005051950.MAA28377@george.lbl.gov> 
References: <200005051950.MAA28377@george.lbl.gov>  
Date: Fri, 05 May 2000 22:54:23 -0600
From: Warner Losh <imp@village.org>
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In message <200005051950.MAA28377@george.lbl.gov> Jin Guojun writes:
: 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?

PCI bus analizer is one way.  Another is to have an ICE that will tell
you the last value of the progam counter.

Without some sort of hardware assist, these thing can be very hard to
track down.

Warner


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