linux-kernel - Re: [GIT PULL rcu/next] rcu commits for 2.6.40

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Date:	Fri, 13 May 2011 16:40:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL rcu/next] rcu commits for 2.6.40


* Ingo Molnar <mingo@...e.hu> wrote:

> > very clearly indicate that this is an RCU regression.
> 
> This might be the same one Yinghai found:
> 
>  e59fb3120bec: rcu: Decrease memory-barrier usage based on semi-formal proof
> 
> So with the config i sent it's definitely reproducible.

yes. And note that the system does not lock up, but boots up after a really 
long time - perhaps as a side-effect of very rare timer irqs driving forward 
the RCU state machine?

Thanks,

	Ingo
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