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From: rogers@dadla.UUCP (Roger Southwick)
Newsgroups: net.unix-wizards
Subject: Re: 4.3 hangs
Message-ID: <954@dadla.UUCP>
Date: Tue, 5-Aug-86 18:32:43 EDT
Article-I.D.: dadla.954
Posted: Tue Aug  5 18:32:43 1986
Date-Received: Thu, 7-Aug-86 06:29:41 EDT
References: <395@hsi.UUCP>
Reply-To: rogers@dadla.UUCP (Roger Southwick)
Distribution: net
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 40

In article <395@hsi.UUCP> stevens@hsi.UUCP (Richard Stevens) writes:
> ...
>
> Does anyone know how to force the kernel to generate a crash dump
> from the console ??

Sure...
    1) Sometime in multi-user, do the following command:

	$ nm /vmunix | grep doadump
	80000e00 T _doadump

	0E00 is the address of the start of the dump routine
	(on my 780 running 4.3BSD.  Your address may be different)

    2) When you need to get a crash dump (assumes Vax 11/780, 11/785:

	    a) Halt the system (don't do any other console commands, except:)
	    b) S 0E00
	       (system does dump, and halts)
	    c) Boot as normal

	
    If you want to look at the crash in single user rather than
    multi, you can boot the system into single user, and then do:

	$ /etc/savecore /usr/crash
    
    This is what happens in /etc/rc, and will move the core file from
    the swap disk (where doadump puts it) into /usr/crash.


Good luck finding your problem.

	-Roger Southwick

	Logic Analyzers Computer Resource Group
	Tektronix, Inc.

	rogers@dadla.tek.com