linux-kernel - Re: tty, vt: lockdep warnings

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Message-ID: <20121026143754.50277bd8@pyramind.ukuu.org.uk>
Date:	Fri, 26 Oct 2012 14:37:54 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, linux-fbdev@...r.kernel.org,
	florianSchandinat@....de
Subject: Re: tty, vt: lockdep warnings

On Thu, 25 Oct 2012 15:37:43 -0400
Sasha Levin <sasha.levin@...cle.com> wrote:

> Hi all,
> 
> While fuzzing with trinity inside a KVM tools (lkvm) guest running latest -next kernel,
> I've stumbled on the following spew:

Looks real enough but its not a tty/vt layer spew. This is all coming out
of the core framebuffer code which doesn't seem to be able to decide what
the locking rules at the invocation of fb_notifier_call_chain are.

It might need some console layer tweaking to provide 'register console
and I already hold the locks' or similar but that notifier needs some
kind of sanity applying as well.

Cc'ing the fbdev folks

Alan
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