On Wed, Sep 09, 2015 at 07:44:51AM -0400, Brian Foster wrote:

On Tue, Sep 08, 2015 at 11:54:07PM -0700, Austin Schuh wrote:

quoted

I'm running xfstests and got the following BUG with lockdep enabled.
I'm running the 4.1.6-rt5 kernel from TI's tree on a TI ARM chip.

Any ideas on what could be causing it, or if it is a real problem?

I see some patches in Dave's latest 4.3 pull request that discuss
lockdep.  Are there any ones there that are worth backporting to my
4.1.6 kernel?

I suspect Dave's recent rework of the lockdep namespace bits is what you
want:

	0952c818 xfs: clean up inode lockdep annotations

Yes, that works around the issue that causes this:

quoted

[ 4357.394974] BUG: looking up invalid subclass: 8

i.e. that we have about 15 different subclass annotations for
different inode locking situations we need to shoe horn into 8
subclasses...

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com