Re: rcu_prempt stalls / lockup

[Dave Jones]

On Tue, Apr 01, 2014 at 04:57:24PM -0700, Paul E. McKenney wrote:
 
 > > [  917.790265] INFO: rcu_preempt detected stalls on CPUs/tasks:
 > > [  917.791189] 	(detected by 0, t=6502 jiffies, g=21390, c=21389, q=0)
 > 
 > But the hang didn't happen until grace period #21390.  Sigh!  That means
 > that the trace doesn't tell me about the current grace period.
 > 
 > Thank you for getting this info, but it is beginning to look like
 > bisection is necessary here.  :-(

ok, I was hoping that wouldn't be the case, but let's see what it turns up.

	Dave

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