linux-kernel - Re: processes hung after sys_renameat, and 'missing' processes

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Date:	Thu, 07 Jun 2012 12:26:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Jones <davej@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <mszeredi@...e.cz>, Jan Kara <jack@...e.cz>
Subject: Re: processes hung after sys_renameat, and 'missing' processes

On Wed, 2012-06-06 at 16:31 -0700, Linus Torvalds wrote:
> PeterZ - the fact that we use mutex_lock_nested with
> I_MUTEX_PARENT/I_MUTEX_CHILD/nothing hopefully doesn't screw us up in
> case we get it wrong, right? 

Sadly, if you get that annotation wrong you can annotate an actual
deadlock away. This the reason you have to be very careful when
annotating stuff.
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