Re: Seeing WARN_ON in ib_dealloc_pd from ipoib in kernel 4.3-rc1-debug

[Sagi Grimberg <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>]

> The following fixup patch is needed:
>
>
>
> Subject: ipoib: For sendonly join free the multicast group on leave
>
> When we leave the multicast group on expiration of a neighbor we
> do not free the mcast structure. This results in a memory leak.
>
> Signed-off-by: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
>
> Index: linux/drivers/infiniband/ulp/ipoib/ipoib.h
> ===================================================================
> --- linux.orig/drivers/infiniband/ulp/ipoib/ipoib.h
> +++ linux/drivers/infiniband/ulp/ipoib/ipoib.h
> @@ -495,6 +495,7 @@ void ipoib_dev_cleanup(struct net_device
>   void ipoib_mcast_join_task(struct work_struct *work);
>   void ipoib_mcast_carrier_on_task(struct work_struct *work);
>   void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb);
> +void ipoib_mcast_free(struct ipoib_mcast *mc);
>
>   void ipoib_mcast_restart_task(struct work_struct *work);
>   int ipoib_mcast_start_thread(struct net_device *dev);
> Index: linux/drivers/infiniband/ulp/ipoib/ipoib_main.c
> ===================================================================
> --- linux.orig/drivers/infiniband/ulp/ipoib/ipoib_main.c
> +++ linux/drivers/infiniband/ulp/ipoib/ipoib_main.c
> @@ -1207,8 +1207,10 @@ static void __ipoib_reap_neigh(struct ip
>
>   out_unlock:
>   	spin_unlock_irqrestore(&priv->lock, flags);
> -	list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
> +	list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
>   		ipoib_mcast_leave(dev, mcast);
> +		ipoib_mcast_free(mcast);
> +	}
>   }
>
>   static void ipoib_reap_neigh(struct work_struct *work)
> Index: linux/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> ===================================================================
> --- linux.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> +++ linux/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> @@ -106,7 +106,7 @@ static void __ipoib_mcast_schedule_join_
>   		queue_delayed_work(priv->wq, &priv->mcast_task, 0);
>   }
>
> -static void ipoib_mcast_free(struct ipoib_mcast *mcast)
> +void ipoib_mcast_free(struct ipoib_mcast *mcast)
>   {
>   	struct net_device *dev = mcast->dev;
>   	int tx_dropped = 0;
>


Hey Christoph,

Thanks for the quick patch. When you re-spin this as
a proper patch you can add my:

Tested-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
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