netdev - Re: [PATCH net] veth: Free queues on link delete

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Date:   Tue, 14 Aug 2018 18:47:25 -0600
From:   David Ahern <dsahern@...il.com>
To:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        dsahern@...nel.org, netdev@...r.kernel.org
Cc:     davem@...emloft.net
Subject: Re: [PATCH net] veth: Free queues on link delete

On 8/14/18 6:37 PM, Toshiaki Makita wrote:
> On 2018/08/15 7:36, dsahern@...nel.org wrote:
>> From: David Ahern <dsahern@...il.com>
>>
>> kmemleak reported new suspected memory leaks.
>> $ cat /sys/kernel/debug/kmemleak
>> unreferenced object 0xffff880130b6ec00 (size 1024):
>>   comm "ip", pid 916, jiffies 4296194668 (age 7251.672s)
>>   hex dump (first 32 bytes):
>>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>>   backtrace:
>>     [<000000001ed37cc9>] kmemleak_alloc+0x70/0x94
>>     [<00000000646dfdeb>] slab_post_alloc_hook+0x42/0x52
>>     [<0000000004aba61b>] __kmalloc+0x101/0x142
>>     [<0000000054d50e21>] kmalloc_array.constprop.20+0x1e/0x26 [veth]
>>     [<000000008238855a>] veth_newlink+0x147/0x3ac [veth]
>> ...
>>
>> The allocation in question is veth_alloc_queues.
>>
>> Free the queues on a delete.
> 
> Oops, thanks for catching this.
> 
>> Fixes: 638264dc90227 ("veth: Support per queue XDP ring")
>> Signed-off-by: David Ahern <dsahern@...il.com>
>> ---
>>  drivers/net/veth.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
>> index e3202af72df5..bef7d212f04e 100644
>> --- a/drivers/net/veth.c
>> +++ b/drivers/net/veth.c
>> @@ -1205,6 +1205,7 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
>>  	struct veth_priv *priv;
>>  	struct net_device *peer;
>>  
>> +	veth_free_queues(dev);
>>  	priv = netdev_priv(dev);
>>  	peer = rtnl_dereference(priv->peer);
> 
> We need to free up peer queues as well.

missed that. Odd that kmemleak was not complaining.

> Also isn't this for net-next though it is now closed?
> 

yes. was not sure if net-next is now net.

will send a v2.