[OpenAFS-devel] Linux 2.6.12 kernel BUG at fs/namei.c:1189

[chas williams - CONTRACTOR]

In message <20060119.132727.09767689.haba@habarber.pdc.kth.se>,Harald Barth writes:
>Can you write a script for me that makes this go "BUG"? I'd put that into
>the Arla test suite right away (and we'd know how a machine with Arla reacts
>on this).

this worked for me to test the problem:

	vos create myserver mypart new.vol

	mkdir a
	cd a
	fs mkm b new.vol
	ls -ld b
	cd ..

	mkdir c
	cd c
	fs mkm d new.vol
	ls -ld d
	mv d e

so initially, the dcache learns that a is the parent of b (new.vol).
however, you then create directory c and mount new.vol as d.  who is the
parent of d?  technically, its c, but afs has learned that new.vol is
b who has a parent of a.  when rename checks the parent of d against
the current directroy, its gets some confusing information, and BUG.