linux-kernel - Re: VFS deadlock ?

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Message-ID: <20130321230746.GA3116@redhat.com>
Date:	Thu, 21 Mar 2013 19:07:46 -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>
Subject: Re: VFS deadlock ?

On Thu, Mar 21, 2013 at 03:53:13PM -0700, Linus Torvalds wrote:
 > On Thu, Mar 21, 2013 at 3:12 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > it's not just irda fwiw..
 > >
 > > p1=rpc p2=rpc p1parent=net p2parent=net
 > 
 > Ok, good. The only rpc/irda that has something in common is
 > /proc/net/, and they both use proc_mkdir() to create the directory:
 > 
 >     proc_irda = proc_mkdir("irda", init_net.proc_net);
 >    ...
 >     sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
 > 
 > so it's almost certainly that case. What I do *not* see is how we got
 > two different dentries for the same name in /proc. But if that
 > happens, then yes, they will have aliased inodes (because
 > proc_get_inode() will look them up by "sb,de->low_ino".
 > 
 > Al, any ideas? There shouldn't be some lookup race, because that's
 > done under the parent inode lock. And multiple mount-points will have
 > different superblocks, so proc_get_inode() will give them separate
 > inodes. And bind mounts should have all the same dentry tree. So what
 > the heck am I missing?

Hmm, these also seem to have appeared around about the time I reenabled
all the namespace options after Eric fixed that last proc bug.

could that be related ?

	Dave
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