linux-kernel - Re: rcu_prempt stalls / lockup

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Date:	Fri, 4 Apr 2014 10:06:39 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: rcu_prempt stalls / lockup

On Thu, Apr 03, 2014 at 06:37:00PM -0400, Dave Jones wrote:
> On Thu, Apr 03, 2014 at 05:44:30PM -0400, Dave Jones wrote:
>  > On Thu, Apr 03, 2014 at 01:46:56PM -0700, Paul E. McKenney wrote:
>  >  > 	git merge anti-fixes
>  >  > 
>  >  > Then bisect through these reverts.
>  >  > 
>  >  > I am assuming, perhaps naively, that changes under Documentation and
>  >  > to torture testing should not be affecting you.
>  >  > 
>  >  > Does this make sense?
>  > 
>  > I tried reverting every one of those and could still hit it, which
>  > seems to indicate the bug is elsewhere, and rcu is just a victim of it.
>  > I'm going to start trying to revert the lockdep changes, given this seems
>  > to happen after that has warned..
> 
> And that was also without any success.
> Tomorrow I'll try a bisect on just arch/x86.

I cannot think of any better debugging strategy at the moment.

							Thanx, Paul

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