On Sat, 2010-02-20 at 15:42 +0800, Dave Young wrote:

> > Well, it used to not deadlock and actually shut down the machine :)
> So
> > in that sense it's definitely new. It might have printed a lockdep
> > warning before, which you wouldn't normally see since the machine
> turns
> > off right after this.
> 
> before shutdown, you can:
> echo N > /proc/sys/kernel/printk_delay
> to see the printk messages, N is 0-10000 in milliseconds

Well if I understand Américo correctly then it won't have printed
anything (even if it were to deadlock) before adding the lockdep
annotations to s_active, so I guess that theory is out.

johannes