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

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Date:	Wed, 6 Jun 2012 19:00:40 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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, Jun 06, 2012 at 03:38:46PM -0700, Linus Torvalds wrote:
 > So what filesystem is this?

The box I saw it on a few days ago: ext4. Today's box: btrfs

 > It really looks like something has left i_mutex locked on a directory,
 > but I'm for the life of me not seeing it. There are lookup changes
 > mainly by Miklos, but they don't seem to change the i_mutex locking.

It is possible that this is a bug stretching back further than 3.4.
I'm continually adding new ways to do terrible things to the fuzzer,
and this last week or so has seen quite a few changes. So maybe I've only
just found a way to tickle this particular bug. (Just like the situation
we had with the mbind corruption a few weeks back).

	Dave

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