linux-kernel - Re: Mysterious CFQ crash and RCU

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Message-ID: <20110522201302.GM2271@linux.vnet.ibm.com>
Date:	Sun, 22 May 2011 13:13:02 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <jaxboe@...ionio.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: Mysterious CFQ crash and RCU

On Sun, May 22, 2011 at 09:30:57PM +0200, Paul Bolle wrote:
> On Sat, 2011-05-21 at 16:54 -0700, Paul E. McKenney wrote:
> > On Sun, May 22, 2011 at 12:23:50AM +0200, Paul Bolle wrote: 
> > > Is anyone able to spot one or more commits in v2.6.39-rc7..v2.6.39 that
> > > might have fixed this Oops? Or did my chance of hitting this Oops,
> > > somehow, just got a lot smaller in v.2.6.39?
> 
> As I just discovered, Fedora Rawhide ships release candidates configured
> with a lot more debugging options set than it ships final releases. So,
> sadly, this didn't get fixed in v2.6.39. It just didn't show up because
> one or more configuration options weren't set while they used to be set
> in the preceding release candidates kernels.
> 
> > 5f45c69589b7d ("read_lock() does not always imply rcu_read_lock()") might
> > well be a fix.
> 
> It doesn't really matter anymore, but that one was actually already
> included in v2.6.39-rc5.

OK, so maybe time to try out the debug approaches I called out earlier?

							Thanx, Paul
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