linux-kernel - Re: [IPV6]: Audit all ip6_dst_lookup/ip6_dst

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Message-Id: <20060730.205623.91207946.davem@davemloft.net>
Date:	Sun, 30 Jul 2006 20:56:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Matt_Domsch@...l.com
Cc:	herbert@...dor.apana.org.au, yoshfuji@...ux-ipv6.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls

From: Matt Domsch <Matt_Domsch@...l.com>
Date: Sun, 30 Jul 2006 22:32:10 -0500

> swapper/0 is trying to acquire lock:
>  (slock-AF_INET6){-+..}, at: [<ffffffff80414fda>] sk_clone+0xd2/0x3a8
> 
> but task is already holding lock:
>  (slock-AF_INET6){-+..}, at: [<ffffffff883d71a8>] tcp_v6_rcv+0x30e/0x76e [ipv6]

The tcp_v6_rcv() code path is holding the slock on the parent
listening socket, whereas in sk_clone() we have grabbed the
socket slock on the newly allocated "newsk" socket.  These
are thus two seperate locks, although they are in the same
locking class "slock-AF_INET6".

I don't know why the lock validator is complaining about this.
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