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

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Message-ID: <alpine.LRH.2.11.1410282147310.19428@adalberg.ut.ee>
Date:	Tue, 28 Oct 2014 21:48:21 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: hung tasks in 3.18.0-rc1-00221-gc3351df

> > > 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>

-- 
Meelis Roos (mroos@...ux.ee)
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