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

Hi Nick,

On Wed, Jan 12, 2011 at 11:52:01PM +0100, Thomas Gleixner wrote:

On Wed, 12 Jan 2011, Uwe Kleine-K?nig wrote:

quoted

quoted

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

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Pengutronix e.K.                           | Uwe Kleine-K?nig            |
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