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From: Sasha Levin <levinsasha928@gmail.com>
Date: Mon, 7 May 2012 19:00:24 +0200
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Subject: Re: [PATCH 3/3] tty_lock: Localise the lock
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
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> So whatever your trace is showing, that's not the bug. Something more
> complicated would appear to be afoot.

Oddly enough, tty != tty->link, but the lockdep warning triggers.

Any idea why it might happen?