Re: [net-next:master 630/633] net/bridge/br_netlink.c:1110:1: warning: the frame size of 2160 bytes is larger than 2048 bytes

[Nikolay Aleksandrov <nikolay@cumulusnetworks.com>]

On 10/05/2015 11:33 AM, Nikolay Aleksandrov wrote:
> On 10/05/2015 11:47 AM, David Miller wrote:
>> From: kbuild test robot <fengguang.wu@intel.com>
>> Date: Mon, 5 Oct 2015 10:42:54 +0800
>>
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
>>> head:   3e087caa23ef36370bfb925d3bbca78e8302d3ce
>>> commit: 7e4df51eb35deedd3ba8d4db92a6c36fb7eff90a [630/633] bridge: netlink: add support for igmp's intervals
>>> config: x86_64-randconfig-s0-10051005 (attached as .config)
>>> reproduce:
>>>         git checkout 7e4df51eb35deedd3ba8d4db92a6c36fb7eff90a
>>>         # save the attached .config to linux build tree
>>>         make ARCH=x86_64 
>>>
>>> All warnings (new ones prefixed by >>):
>>>
>>>    net/bridge/br_netlink.c: In function 'br_fill_info':
>>>>> net/bridge/br_netlink.c:1110:1: warning: the frame size of 2160 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>>     }
>>
>> Nikolay, please look into this.
>>
> 
> I am, this looks like to be caused by enabling KASAN (kernel address sanitizer), there's 
> a lot of additional code generated and the frame grows bigger.
> The same thing is being discussed here:
> http://www.spinics.net/lists/linux-media/msg93925.html
> 
> The real size is much smaller without kasan.
> 

I'm not sure how to proceed, would you like me to shrink the frame size so it's
less than 2160 bytes with KASAN enabled ?
It's 216 (without kasan) bytes vs 2160 (with).

Thanks,
 Nik