netdev - Re: [PATCH net] htb: call qdisc_root with rcu read lock held

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Date:	Wed, 15 Jun 2016 14:43:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] htb: call qdisc_root with rcu read lock held

From: Florian Westphal <fw@...len.de>
Date: Tue, 14 Jun 2016 06:16:27 +0200

> saw a debug splat:
> net/include/net/sch_generic.h:287 suspicious rcu_dereference_check() usage!
> other info that might help us debug this:
> rcu_scheduler_active = 1, debug_locks = 0
>  2 locks held by kworker/2:1/710:
>   #0:  ("events"){.+.+.+}, at: [<ffffffff8106ca1d>]
>   #1:  ((&q->work)){+.+...}, at: [<ffffffff8106ca1d>] process_one_work+0x14d/0x690
> Workqueue: events htb_work_func
> Call Trace:
>  [<ffffffff812dc763>] dump_stack+0x85/0xc2
>  [<ffffffff8109fee7>] lockdep_rcu_suspicious+0xe7/0x120
>  [<ffffffff814ced47>] htb_work_func+0x67/0x70
> 
> Signed-off-by: Florian Westphal <fw@...len.de>

Applied.