netdev - Re: Latest net-next from GIT panic

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Date:   Wed, 20 Sep 2017 16:03:39 +0200
From:   Paweł Staszewski <pstaszewski@...are.pl>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Wei Wang <weiwan@...gle.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        edumazet@...gle.com
Subject: Re: Latest net-next from GIT panic

Nit much more after adding this patch

https://bugzilla.kernel.org/attachment.cgi?id=258529



W dniu 2017-09-20 o 15:44, Eric Dumazet pisze:
> On Wed, 2017-09-20 at 15:39 +0200, Paweł Staszewski wrote:
>> W dniu 2017-09-20 o 15:34, Eric Dumazet pisze:
>>> Could you try this debug patch ?
>>>
>>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>>> index f535779d9dc1dfe36934c2abba4e43d053ac5d6f..1eaa3553a724dc8c048f67b556337072d5addc82 100644
>>> --- a/include/linux/netdevice.h
>>> +++ b/include/linux/netdevice.h
>>> @@ -3331,7 +3331,14 @@ void netdev_run_todo(void);
>>>     */
>>>    static inline void dev_put(struct net_device *dev)
>>>    {
>>> -	this_cpu_dec(*dev->pcpu_refcnt);
>>> +	int __percpu *pref = READ_ONCE(dev->pcpu_refcnt);
>>> +
>>> +	if (!pref) {
>>> +		pr_err("no pcpu_refcnt on dev %p(%s) state %d dismantle %d\n",
>>> +		       dev, dev->name, dev->reg_state, dev->dismantle);
>>> +		BUG();
>>> +	}
>>> +	this_cpu_dec(*pref);
>>>    }
>>>    
>>>    /**
>>>
>>>
>>>
>> You want me to add this patch to what kernel version ?
>> currently im after git bisect reset - so mainline stable
>>
> Simply us the latest net-next as mentioned in the thread title, thanks.
>
>
>