linux-kernel - Re: BUG_ON(nd->inode != parent->d

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Message-ID: <CA+55aFxBvyLcWJB0JMNcaCXHtgvPLt3cFQqJeRFcb=6rkZFtvA@mail.gmail.com>
Date:	Fri, 8 Mar 2013 15:45:37 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: BUG_ON(nd->inode != parent->d_inode);

On Fri, Mar 8, 2013 at 3:30 PM, Dave Jones <davej@...hat.com> wrote:
> [  100.729401] nd->last.name = (\xffffffd2.W._.N.".\xfffffffe.\xffffff80.^N.?.\xffffffe4.E.8.g.\xffffffd2.N.\xffffffb6.^G.\xfffffff1.\xffffffcc.U.\xffffffda.^_.h.^M.1.\xffffffc5.\xffffff82.%.B.\xffffffe0.\xffffffad.^U.8.^L.c.Z.^K.\xffffffe4.h.J.\xffffffc8.\xffffffad.\xffffff83./.\xffffff80.\xffffffd1.\xffffffe5.\xffffff87.\xffffffc3.\xffffffb2.\xffffffdc.\xffffff9d.\xffffffd1.E.\xffffffab.^B.

You're printing out a 'char' with %02x, aren't you? And then the sign
extensions gives you six extra 'f' character every time the char is
negative.

If using %02x, make sure you use 'unsigned char', or "& 255".

Depending on just what is going on, the "nd->last.name" thing really
is probably a valid string. Strictly speaking it's not necessarily
NUL-terminated, though, and should be printed out to a maximum of
"nd->last.len" characters (but the whole path will be NUL-terminated,
so it's all ok, you just might print out more than one component)

               Linus
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