[LEDE-DEV] FW: UDP throughput caused kernel panic if configured bridge mode in /etc/config/network

[Ben Greear]

On 04/24/2017 12:39 AM, Y.B. Lu wrote:
> Hi John,
>
> Thank you very much.
>
> But I still feel it's strange the crash didn't happen if used brctl to configure instead of /etc/config/network.
> Much memory(about 700MB) was consumed in UDP throughput test only when used /etc/config/network.
>
> As I know, both ls1043a with DPAA ethernet driver and ls1012a with ppfe ethernet driver had this issue.
> I think maybe I should focus on deep studying in /etc/config/network. But we had a deadline by this month to resolve it.
>
> Is there any possibility the issue was caused by OpenWrt?
> Thanks again.
>
>
>
> Best regards,
> Yangbo Lu
>
>> -----Original Message-----
>> From: John Crispin [mailto:john at phrozen.org]
>> Sent: Monday, April 24, 2017 12:31 PM
>> To: Y.B. Lu; lede-dev at lists.infradead.org; jo at mein.io
>> Cc: Wes Li; Xiaobo Xie
>> Subject: Re: [LEDE-DEV] FW: UDP throughput caused kernel panic if
>> configured bridge mode in /etc/config/network
>>
>> Hi,
>>
>> this is most certainly a bug in the kernel. either the ethernet driver
>> blows up under load or some other memory allocation related bug. it is
>> very common for ethernet to kill boards under load by triggering bugs.
>>
>>      John
>>
>> On 24/04/17 05:49, Y.B. Lu wrote:
>>> Hi John and Jo-Philipp,
>>>
>>> Have you ever got similar problem, or known any possible reason about
>>> this, or known anyone who probably know this?
>>>
>>> I just found much memory would be consumed if I configured board as
>>> bridge mode in /etc/config/network and did UDP throughput test.
>>> But using brctl to configure bridge mode didn't consume memory.
>>>
>>> Thank you very much.
>>>
>>>
>>> Best regards,
>>> Yangbo Lu
>>>
>>>
>>>> -----Original Message-----
>>>> From: Y.B. Lu
>>>> Sent: Thursday, April 13, 2017 1:24 PM
>>>> To: 'lede-dev at lists.infradead.org'
>>>> Subject: UDP throughput caused kernel panic if configured bridge mode
>>>> in /etc/config/network
>>>>
>>>> Hi all,
>>>>
>>>> Recently I got below kernel panic when did UDP throughput test on NXP
>>>> LS1043ARDB board. I configured the bridge mode in /etc/config/network.
>>>> But if I used 'brctl' to configure the bridge mode, this issue would
>>>> not happen.
>>>> I also noticed almost all memory was consumed(about 700MB) when
>>>> kernel crashed.
>>>> Anyone have any idea about this?  Thank you very much.
>>>>
>>>> root at LEDE:/etc/fmc/config# [  263.981540] ksoftirqd/3: page
>>>> allocation
>>>> failure: order:0, mode:0x2080020 [  263.988339] CPU: 3 PID: 19 Comm:
>>>> ksoftirqd/3 Not tainted 4.4.52 #0 [  263.994508] Hardware name:

This looks like just a warning...did the system really panic and stop working?

Thanks,
Ben


-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com