netdev - Re: oops in udpv6

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Message-ID: <20130417141138.GA17648@redhat.com>
Date:	Wed, 17 Apr 2013 10:11:38 -0400
From:	Dave Jones <davej@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: oops in udpv6_sendmsg

On Tue, Apr 16, 2013 at 07:02:12PM -0700, Eric Dumazet wrote:

 > > rax is all kinds of crazy. 7ae9fffffff2b8ff doesn't look anything like an address.
 > 
 > rt->rt6i_idev contains garbage. It looks like a dst refcount issue.
 > 
 > Wow, it seems ip6_append_data() calls sock_alloc_send_skb() and can
 > release socket lock while waiting for buffer space.
 > 
 > This completely defeats corking, as another thread can mess with
 > cork->dst at the same time.
 > 
 > We need to hold dst before sleeping in sock_alloc_send_skb()

good news is that with some changes, I was able to make current
trinity reproduce this in seconds rather than hours..

./trinity -q -l off -n -c sendmsg -c connect 

on current tree seems to reliably trigger it for me.

	Dave 
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