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

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Message-ID: <20120611121708.GC7654@fieldses.org>
Date:	Mon, 11 Jun 2012 08:17:08 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <mszeredi@...e.cz>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sage Weil <sage@...dream.net>
Subject: Re: processes hung after sys_renameat, and 'missing' processes

On Fri, Jun 08, 2012 at 10:44:09AM -0700, Linus Torvalds wrote:
> On Fri, Jun 8, 2012 at 9:22 AM, J. Bruce Fields <bfields@...ldses.org> wrote:
> > On Thu, Jun 07, 2012 at 08:36:07PM +0100, Al Viro wrote:
> >
> >> I really believe that this pair of commits needs to be reverted.  The
> >> earlier code used to guarantee that alias would be detached.
> >
> > In the case that prompted that first commit, the directory in question
> > had an alias that was detached (which I'm taking to mean IS_ROOT(dentry)
> > was true?), but not flagged DISCONNECTED.  The particular case was only
> > reproduceable on an older kernel, and I couldn't find a similar
> > reproducer on recent upstream, but I also couldn't convince myself it
> > was impossible.
> >
> > So, maybe the correct thing is to revert that change.  Or maybe it
> > should be picking an IS_ROOT dentry instead of a DISCONNECTED one?
> 
> I've reverted the changes for now, it looks like the discussion about
> them is still on-going, and I think I'll feel happier if we just go
> back to the old status quo for the nonce.

Fair enough; I'll keep investigating.

--b.
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