linux-kernel - Re: hung tasks in 3.18.0-rc1-00221-gc3351df

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Message-ID: <20141028202251.GZ5718@linux.vnet.ibm.com>
Date:	Tue, 28 Oct 2014 13:22:52 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: hung tasks in 3.18.0-rc1-00221-gc3351df

On Tue, Oct 28, 2014 at 09:48:21PM +0200, Meelis Roos wrote:
> > > > rcu: Make rcu_barrier() understand about missing rcuo kthreads
> > > 
> > > I can not trigger the previous problem at will so my testing is not very 
> > > useful. I tested the previous patch that you sent but the problem did 
> > > not trigger, and yesterday applied this one and it still does not 
> > > trigger, but I an using remote sessions only for now (no desktop).
> > > 
> > > At least it's not clearly broken :)
> > 
> > A couple of other people had more reproducible test setups and confirmed
> > that it fixed them.
> > 
> > But yes, there are no doubt other RCU bugs waiting to be found.  ;-)
> 
> I reproduced the problem on Thinkpad T400 with Core2Duo and Chromium 
> startup failing, and your patch fixes that.
> 
> Tested-by: Meelis Roos <mroos@...ux.ee>

Got it, thank you!!!

							Thanx, Paul

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