linux-kernel - Re: [bug, netconsole, SLUB] BUG skbuff_head

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Message-ID: <20080721212447.GA10107@2ka.mipt.ru>
Date:	Tue, 22 Jul 2008 01:24:48 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Vegard Nossum <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, cl@...ux-foundation.org,
	davem@...emloft.net, Auke Kok <auke-jan.h.kok@...el.com>
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten

On Mon, Jul 21, 2008 at 09:21:38PM +0200, Ingo Molnar (mingo@...e.hu) wrote:
> So it's now a strong likelyhood that this crash is a combination of 
> e1000e+netconsole.

e1000_clean_tx_irq() call looks particulary suspicious: it is called
without adapter->tx_queue_lock in poll controller (netconsole callback)
and with that lock in NAPI handler.

Can you check kind of this patch:

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 869544b..5f180d8 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -4067,7 +4067,9 @@ static void e1000_netpoll(struct net_device *netdev)
 	disable_irq(adapter->pdev->irq);
 	e1000_intr(adapter->pdev->irq, netdev);
 
+	spin_lock(&adapter->tx_queue_lock);
 	e1000_clean_tx_irq(adapter);
+	spin_unlock(&adapter->tx_queue_lock);
 
 	enable_irq(adapter->pdev->irq);
 }


-- 
	Evgeniy Polyakov
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