BUG: spinlock recursion (sys_chdir, user_path_at, do_path_lookup ...)

[Uwe Kleine-König]

Hi Nick,

On Wed, Jan 12, 2011 at 11:52:01PM +0100, Thomas Gleixner wrote:
> On Wed, 12 Jan 2011, Uwe Kleine-König wrote:
> > > Reverting: fs: rcu-walk aware d_revalidate method
> > > commit: 34286d6662308d82aed891852d04c7c3a2649b16
> > I found that one, too, in the meantime.  Currently debugging that with
> > tglx on irc.
> 
> The last finding is that parent and dentry in
> nameidata_dentry_drop_rcu() are the same, which explains the lock
> recursion nicely. 
> 
> @nick: Anything you want us to add to the debugging ?
If that helps, the chdir is to / (probably while being already in /).
Maybe the problem is that "/." == "/.."?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |