netdev - Re: bnx2_poll panicking kernel

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Message-ID: <20080710220030.GA29558@orion.carnet.hr>
Date:	Fri, 11 Jul 2008 00:00:30 +0200
From:	Josip Rodin <joy@...uzijast.net>
To:	Michael Chan <mchan@...adcom.com>
Cc:	David Miller <davem@...emloft.net>,
	"billfink@...dspring.com" <billfink@...dspring.com>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	netdev <netdev@...r.kernel.org>,
	"mirrors@...ian.org" <mirrors@...ian.org>
Subject: Re: bnx2_poll panicking kernel

On Thu, Jul 10, 2008 at 02:38:41PM -0700, Michael Chan wrote:
> On Thu, 2008-07-10 at 14:23 -0700, Josip Rodin wrote:
> > I'll try it - but just as I was reading this e-mail, the machine
> > managed to
> > crash :(
> > 
> > The log was:
> > 
> > BUG: unable to handle kernel NULL pointer dereference at
> > 00000000000000b8
> > IP: [<ffffffff8807ad7e>] :bnx2:bnx2_tx_int+0x7e/0x3f0
> 
> This is the same crash that you originally reported.  The driver was
> referencing a NULL SKB because the skb_shinfo(skb)->nr_frags was
> modified on the previous packet in the TX ring.
> 
> If you had applied my debug patch #1 that I posted several weeks ago, it
> should have avoided this because we should have saved away the nr_frags
> for every packet on the TX ring.

It was that same patched kernel that crashed nevertheless.

-- 
Josip Rodin
mirrors@...ian.org
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