xfs deadlock in stable kernel 3.0.4

[Christoph Hellwig]

On Wed, Sep 14, 2011 at 09:48:18AM +0200, Stefan Priebe - Profihost AG wrote:
> #0: (&sb->s_type->i_mutex_key#5){+.+.+.}, at: [] do_last+0x287/0x693

This means you are running your heavy load with lockdep enabled.  I
can't see how it directly causes your issues, but it will slow anything
down to almost a grinding halt on systems with more than say two cores.

Can you run with CONFIG_DEBUG_LOCK_ALLOC / and CONFIG_PROVE_LOCKING
disabled/  It might be worth if you have other really heavy debugging
options enabled, too.