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Path: utzoo!utgpu!water!watmath!clyde!rutgers!husc6!bloom-beacon!oberon!sdcrdcf!trwrb!felix!zemon
From: zemon@felix.UUCP
Newsgroups: comp.unix.ultrix
Subject: panic: rename: lost dir entry
Message-ID: <8196@felix.UUCP>
Date: Fri, 2-Oct-87 17:32:48 EDT
Article-I.D.: felix.8196
Posted: Fri Oct  2 17:32:48 1987
Date-Received: Sun, 4-Oct-87 07:07:27 EDT
Sender: zemon@felix.UUCP
Organization: FileNet Corp., Costa Mesa, CA, USA
Lines: 27
Approved: zemon@felix.UUCP (Art Zemon)

References:

Our Ultrix v2.0 crashed today with this panic.  I mention it
because it was caused (as far as I can tell) by an ordinary
user and it left file system damage which fsck did not
correct.

I was able to crash the system when logged in as myself (not
root) by executing the following two commands:

    % mkdir /sys/BINARY.vax/normal
    % mv /sys/BINARY.vax/normal /sys/BINARY.vax/normal.lat

I never got a prompt back from the "mv" command.  When the
system came back up, I found that both normal and normal.lat
directories existed and were hard linked.

    % ls -ldi /sys/BINARY.vax/normal*
    98697 drwxrwxr-x  3 zemon  512 Oct  2 10:48 /sys/BINARY.vax/normal
    98697 drwxrwxr-x  3 zemon  512 Oct  2 10:48 /sys/BINARY.vax/normal.lat

If you get a similar crash, you may want to go looking for
places where your heirarchical file system has become a
network.

	-- Art Zemon
	   By Computer:	    ...!hplabs!felix!zemon
	   By Air:	    Archer N33565
	   By Golly:	    moderator of comp.unix.ultrix