linux-kernel - Re: automount hangs during boot somewhere in rcu

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Message-ID: <20120605151930.GG2388@linux.vnet.ibm.com>
Date:	Tue, 5 Jun 2012 08:19:30 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: automount hangs during boot somewhere in rcu_barrier.

On Tue, Jun 05, 2012 at 12:46:58PM +0300, Gleb Natapov wrote:
> On Mon, Jun 04, 2012 at 07:54:32AM -0700, Paul E. McKenney wrote:
> > On Mon, Jun 04, 2012 at 01:09:25PM +0300, Gleb Natapov wrote:
> > > On Mon, Jun 04, 2012 at 10:48:03AM +0300, Gleb Natapov wrote:
> > > > On Sun, Jun 03, 2012 at 08:15:49PM -0700, Paul E. McKenney wrote:
> > > > > Hmmm...  Could you please try disabling CONFIG_RCU_FAST_NO_HZ?  If that
> > > > > makes the problem go away, I have some patches 3.6-targeted patches
> > > > > for you.
> > > > Will report back.
> > > > 
> > > Do not see any problems with the option disabled.
> > 
> > OK, then you are probably being bitten by the same bug that was biting
> > Pascal and Heiko.  Could you please apply the following series from -rcu?
> > 
> > 	bf7757c3 (Merge commit 'v3.4-rc6' into HEAD)
> > 	edc17350 (RCU_FAST_NO_HZ detection of callback adoption)
> > 	8e03a88e (Update RCU_FAST_NO_HZ tracing for lazy callbacks)
> > 	f2298c63 (Move RCU_FAST_NO_HZ per-CPU variables to rcu_dynticks structure)
> > 	05cc0fc9 (Precompute RCU_FAST_NO_HZ timer offsets)
> > 	477fca01 (Dump only the current CPU's buffers for idle-entry/exit warnings)
> > 	f29075fb (The rcu_needs_cpu() function is not a quiescent state)
> > 
> > Of these, 05cc0fc9 (Precompute RCU_FAST_NO_HZ timer offsets) is likely
> > to be the most relevant.  The -rcu tree may be found at:
> > 
> > 	git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> > 
> > Please let me know if you have any trouble pulling this series.
> > 
> The problem is gone with the series + enabling CONFIG_RCU_FAST_NO_HZ
> back.

Very good!!!

Maybe I should be submitting this series to 3.5 rather than 3.6?

							Thanx, Paul

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