netdev - Re: cgroups/netlink related rcu_dereference_check() without protection (2.6.35.4)

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Date:	Thu, 02 Sep 2010 13:53:54 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Dave Jones <davej@...hat.com>
CC:	netdev@...r.kernel.org, Paul Menage <menage@...gle.com>
Subject: Re: cgroups/netlink related rcu_dereference_check() without protection
 (2.6.35.4)

Dave Jones wrote:
> I see this during boot on one of my boxes..
> 
> 	Dave
> 
> INFO: suspicious rcu_dereference_check() usage. ]
> ---------------------------------------------------
> include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection!
> 

Will send out a fix soon.

> other info that might help us debug this:
> 
> 
> rcu_scheduler_active = 1, debug_locks = 0
> 1 lock held by swapper/1:
>  #0:  (net_mutex){+.+.+.}, at: [<c074b595>] register_pernet_subsys+0x17/0x34
> 
> stack backtrace:
> Pid: 1, comm: swapper Not tainted 2.6.35.4-15.fc14.i686.PAE #1
> Call Trace:
>  [<c07e2197>] ? printk+0x25/0x2e
>  [<c0467969>] lockdep_rcu_dereference+0x7d/0x86
>  [<c07440ea>] sock_update_classid+0x6c/0x8e
>  [<c074416b>] sk_alloc+0x5f/0x6a
>  [<c07674a9>] __netlink_create+0x2a/0x90
>  [<c0768d54>] netlink_kernel_create+0x5f/0x14f
>  [<c075805c>] rtnetlink_net_init+0x23/0x3b
>  [<c0759412>] ? rtnetlink_rcv+0x0/0x27
>  [<c074b388>] ops_init+0xda/0xe9
>  [<c074b4c8>] register_pernet_operations+0x84/0xee
>  [<c074b5a1>] register_pernet_subsys+0x23/0x34
>  [<c0ab7e94>] rtnetlink_init+0x42/0xe0
>  [<c0ab84fa>] netlink_proto_init+0xee/0x103
>  [<c0ab840c>] ? netlink_proto_init+0x0/0x103
>  [<c0403182>] do_one_initcall+0x62/0x170
>  [<c0a809d3>] kernel_init+0x1b9/0x23a
>  [<c0a8081a>] ? kernel_init+0x0/0x23a
>  [<c0408fc2>] kernel_thread_helper+0x6/0x10
> 
> 
> 
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