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Date: Thu, 29 Jul 1999 15:40:05 GMT
From: "Julian Stacey" <jhs@jhs.muc.de>
Reply-To: "Julian Stacey" <jhs@colin.muc.de>
To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/12884: panic: lockmgr: locking against myself - from amd with nfs
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>Number:         12884
>Category:       kern
>Synopsis:       Hot to panic FreeBSD-3.2-Release
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jul 30 01:50:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Julian H. Stacey jhs@freebsd.org
>Release:        FreeBSD 3.2-RELEASE i386
>Organization:
>Environment:

	3.2-Rel, nfs & amd

>Description:

	How to panic the kernel:

>How-To-Repeat:
	amd -p -k i386 -l syslog -a /a /host /etc/amd.map # from rc.conf
	grep `hostname -s` /etc/exports # note removing hostname 
					# does not prevent a crash
	ln -s .. /a/`hostname -s`
	wall warn all users we are about to crash
	echo now see	panic: lockmgr: locking against myself
	ls /host/`hostname -s`	# panic occurs

	OK, it's silly to do
	 	ln -s .. /a/`hostname -s`
	but it's unfortunate that it panics.
		(I did the ln on a spare box while experimenting to try to
		find some way to have /host/* mount the other hosts,
		but /host/`hostname -s` just be root (or better "..")
		as I use sitewide addresses like /host/some_host/usr3/.....
		& I want the access to be a more efficient ufs direct
		in the one case where the  host happens to be local -
		I haven't found a solution to that yet BTW)

>Fix:
	
	Maybe AMD should at startup do
		chmod a-w o-w /a ; chown 0 /a


>Release-Note:
>Audit-Trail:
>Unformatted:


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