linux-kernel - Re: next-20081215: kernel BUG at block/cfq-iosched.c:1243

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Date:	Mon, 15 Dec 2008 21:18:36 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alexander Beregalov <a.beregalov@...il.com>
Cc:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: next-20081215: kernel BUG at block/cfq-iosched.c:1243

On Mon, Dec 15 2008, Alexander Beregalov wrote:
> 2008/12/15 Jens Axboe <jens.axboe@...cle.com>:
> > On Mon, Dec 15 2008, Alexander Beregalov wrote:
> >> 2008/12/15 Jens Axboe <jens.axboe@...cle.com>:
> >> >> [   23.080733] kernel BUG at block/cfq-iosched.c:1243!
> >> >> [   23.080733] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> >>
> >> > Odd, is it reproducible? What is your .config?
> >> Yes, it is
> >>
> >> Config is in attach
> >
> > It's weird, because the only change for CFQ in that area is the one
> > below. Does the oops go away if you back this out?
> Yes, it can boot without the patch, no oops.

OK, dumb error. Please try this instead, on top of -next:

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8a2485d..e8525fa 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1322,7 +1322,6 @@ static void cfq_exit_single_io_context(struct io_context *ioc,
 		smp_read_barrier_depends();
 		if (cic->key)
 			__cfq_exit_single_io_context(cfqd, cic);
-		__cfq_exit_single_io_context(cfqd, cic);
 
 		spin_unlock_irqrestore(q->queue_lock, flags);
 	}

-- 
Jens Axboe

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