netdev - Re: Kernel panic from tg3 net driver

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Date:	Thu, 20 Oct 2011 22:05:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	ari.m.savolainen@...il.com, richardcochran@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Kernel panic from tg3 net driver

Le jeudi 20 octobre 2011 à 15:56 -0400, David Miller a écrit :
> From: Ari Savolainen <ari.m.savolainen@...il.com>
> Date: Thu, 20 Oct 2011 22:30:44 +0300
> 
> > I finally got time to continue bisecting. The commit that causes the
> > kernel panic is:  2669069aacc9 "tg3: enable transmit time stamping."
> 
> I thought initially that the issue might be that we have to do the
> skb_tx_timestamp() call before we advance the mailbox transmit
> descriptor pointer.
> 
> But that shouldn't matter, we run with a lock held, and TX reclaim takes
> that same lock.
> 
> So I'm sort of stumped at the moment.

But its not a panic, its a RCU splat ?

> [  105.612129]  [<ffffffff810ccdcb>] lockdep_rcu_dereference+0xbb/0xc0
> [  105.612132]  [<ffffffff815dc5a9>] neigh_update+0x4f9/0x5f0
> [  105.612135]  [<ffffffff815da001>] ? neigh_lookup+0xe1/0x220
> [  105.612139]  [<ffffffff81639298>] arp_req_set+0xb8/0x230
> [  105.612142]  [<ffffffff8163a59f>] arp_ioctl+0x1bf/0x310
> [  105.612146]  [<ffffffff810baa40>] ? lock_hrtimer_base.isra.26+0x30/0x60
> [  105.612150]  [<ffffffff8163fb75>] inet_ioctl+0x85/0x90
> [  105.612154]  [<ffffffff815b5520>] sock_do_ioctl+0x30/0x70
> [  105.612157]  [<ffffffff815b55d3>] sock_ioctl+0x73/0x280
> [  105.612162]  [<ffffffff811b7698>] do_vfs_ioctl+0x98/0x570
> [  105.612165]  [<ffffffff811a5c40>] ? fget_light+0x340/0x3a0
> [  105.612168]  [<ffffffff811b7bbf>] sys_ioctl+0x4f/0x80
> [  105.612172]  [<ffffffff816fdcab>] system_call_fastpath+0x16/0x1b

And I think this was fixed yesterday ?

De: 	roy.qing.li@...il.com
À: 	ari.m.savolainen@...il.com, netdev@...r.kernel.org
Sujet: 	[PATCH net-next] neigh: fix rcu splat in neigh_update()
Date: 	Tue, 18 Oct 2011 16:32:42 +0800 (18/10/2011 10:32:42)


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