Re: VFS deadlock ?

[Dave Jones <davej@redhat.com>]

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@redhat.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