netdev - Re: panic 2.6.27-rc3-git2, qdisc_dequeue

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Date:	Sat, 16 Aug 2008 22:22:56 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: panic 2.6.27-rc3-git2, qdisc_dequeue_head

> These patches shouldn't change so much. I meant: was this last patch
> (with previous one ie. take #3) tested the same as earlier take #3
> alone? (There were warnings only, no oopses.)
Yes, sure with take #3 also.

Warnings disappeared, but kernel paniced, and it is really looks like another 
bug. I will try also to enable more debug options at night (after 2-3 hours, 
when traffic is low), including intensive memory debugging, maybe i can catch 
some memory poisoning.

>
> BTW, here is a patch with another way of fixing this. I would be glad
> if you could try this too. The previous patch should be reverted, so
> we need only: "take #3", this one and these two you mentioned above.
>
> Jarek P.
>
> ---
>
>  include/linux/netdevice.h |    1 +
>  include/net/sch_generic.h |    5 ++++-
>  net/core/dev.c            |    1 +
>  3 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 488c56e..7041c2c 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -445,6 +445,7 @@ struct netdev_queue {
>  	struct net_device	*dev;
>  	struct Qdisc		*qdisc;
>  	unsigned long		state;
> +	spinlock_t		qdisc_lock;
>  	spinlock_t		_xmit_lock;
>  	int			xmit_lock_owner;
>  	struct Qdisc		*qdisc_sleeping;
> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> index a7abfda..f84e96c 100644
> --- a/include/net/sch_generic.h
> +++ b/include/net/sch_generic.h
> @@ -185,7 +185,10 @@ static inline struct qdisc_skb_cb *qdisc_skb_cb(struct
> sk_buff *skb)
>
>  static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
>  {
> -	return &qdisc->q.lock;
> +	if (unlikely(qdisc->flags & TCQ_F_BUILTIN))
> +		return &qdisc->q.lock;
> +
> +	return &qdisc->dev_queue->qdisc_lock;
>  }
>
>  static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 600bb23..9ec20e0 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -3859,6 +3859,7 @@ static void __netdev_init_queue_locks_one(struct
> net_device *dev, void *_unused)
>  {
>  	spin_lock_init(&dev_queue->_xmit_lock);
> +	spin_lock_init(&dev_queue->qdisc_lock);
>  	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
>  	dev_queue->xmit_lock_owner = -1;
>  }
> --
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