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

[John Crispin]

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: Freescale
>> LS1043A [  263.998767] Backtrace:
>> [  264.001213] [<c001b324>] (dump_backtrace) from [<c001b520>]
>> (show_stack+0x18/0x1c) [  264.008771]  r7:00000000 r6:00000000
>> r5:60000013 r4:00000000 [  264.014435] [<c001b508>] (show_stack) from
>> [<c01a2d08>] (dump_stack+0x84/0xa4) [  264.021652] [<c01a2c84>]
>> (dump_stack) from [<c008e6ec>] (warn_alloc_failed+0xf0/0x114)
>> [  264.029558]  r5:02080020 r4:00000000 [  264.033133] [<c008e600>]
>> (warn_alloc_failed) from [<c0090aa0>] (__alloc_pages_nodemask+0x68c/0x6c0)
>> [  264.042166]  r3:00000000 r2:00000000
>> [  264.045735]  r7:00000030 r6:02080020 r5:00000000 r4:02080020
>> [  264.051400] [<c0090414>] (__alloc_pages_nodemask) from [<c02e9000>]
>> (_dpa_bp_add_8_bufs+0x40/0x250) [  264.060434]  r10:c001db08 r9:ebc93d48
>> r8:ebf61650 r7:00000003 r6:00000004 r5:eb603c10 [  264.068266]
>> r4:8193f040 [  264.070796] [<c02e8fc0>] (_dpa_bp_add_8_bufs) from
>> [<c02e9238>] (dpaa_eth_refill_bpools+0x28/0x58)
>> [  264.079742]  r10:eb09d480 r9:eb604a74 r8:ef1d9400 r7:eb09d000
>> r6:ebf61650 r5:ef1e0b44 [  264.087577]  r4:0000007f [  264.090106]
>> [<c02e9210>] (dpaa_eth_refill_bpools) from [<c02e80a0>]
>> (priv_rx_default_dqrr+0xd8/0x124) [  264.099313]  r7:eb09d000 r6:ebf61650
>> r5:ef1e0b44 r4:ef1e15e0
>>
>> The /etc/config/network for bridge mode as below.
>> config interface 'lan'
>>          option type 'bridge'
>>          option ifname 'eth2 eth6'
>>          option proto 'static'
>>          option ipaddr '192.168.1.1'
>>          option netmask '255.255.255.0'
>>          option ip6assign '60'
>>
>> brctl manual config as below.
>> ifconfig eth2 up
>> ifconfig eth6 up
>> brctl addif br-lan eth6
>> brctl addif br-lan eth2
>>
>>
>>
>> best regards,
>> Yangbo Lu
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