linux-kernel - Re: rcu_prempt stalls / lockup

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Message-ID: <20140402000758.GA1440@redhat.com>
Date:	Tue, 1 Apr 2014 20:07:58 -0400
From:	Dave Jones <davej@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: rcu_prempt stalls / lockup

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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