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Date:	Fri, 8 Aug 2014 14:46:48 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	linux-kernel@...r.kernel.org, riel@...hat.com, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB
 kthread wakeups

On Fri, Aug 08, 2014 at 02:43:47PM -0700, Paul E. McKenney wrote:
> On Sat, Aug 09, 2014 at 12:04:24AM +0530, Amit Shah wrote:
> > On (Fri) 08 Aug 2014 [11:18:35], Paul E. McKenney wrote:
> 
> [ . . . ]
> 
> > > Hmmm... What happens if you boot a7d7a143d0b4cb1914705884ca5c25e322dba693
> > > with the kernel parameter "acpi=off"?
> > 
> > That doesn't change anything - still hangs.
> > 
> > I intend to look at this more on Monday, though - turning in for
> > today.  In the meantime, if there's anything else you'd like me to
> > try, please let me know.
> 
> OK, given that I still cannot reproduce it, I do need your help with
> the diagnostics.  And so what sorts of diagnostics work for you in
> the hung state?  Are you able to dump ftrace buffers?
> 
> If you are able to dump ftrace buffers, please enable rcu:rcu_nocb_wake
> and send me the resulting trace.

And another random kernel boot parameter to try is rcu_nocb_poll.

							Thanx, Paul

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